http://git-wip-us.apache.org/repos/asf/incubator-ignite/blob/ace354c6/modules/hadoop/src/main/java/org/apache/ignite/internal/processors/hadoop/jobtracker/GridHadoopJobTracker.java
----------------------------------------------------------------------
diff --git
a/modules/hadoop/src/main/java/org/apache/ignite/internal/processors/hadoop/jobtracker/GridHadoopJobTracker.java
b/modules/hadoop/src/main/java/org/apache/ignite/internal/processors/hadoop/jobtracker/GridHadoopJobTracker.java
deleted file mode 100644
index 0beaf32..0000000
---
a/modules/hadoop/src/main/java/org/apache/ignite/internal/processors/hadoop/jobtracker/GridHadoopJobTracker.java
+++ /dev/null
@@ -1,1625 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.ignite.internal.processors.hadoop.jobtracker;
-
-import org.apache.ignite.*;
-import org.apache.ignite.events.*;
-import org.apache.ignite.events.EventType;
-import org.apache.ignite.internal.*;
-import org.apache.ignite.internal.managers.eventstorage.*;
-import org.apache.ignite.internal.processors.cache.*;
-import org.apache.ignite.internal.processors.hadoop.*;
-import org.apache.ignite.internal.processors.hadoop.counter.*;
-import org.apache.ignite.internal.processors.hadoop.taskexecutor.*;
-import org.apache.ignite.internal.processors.hadoop.taskexecutor.external.*;
-import org.apache.ignite.internal.util.*;
-import org.apache.ignite.internal.util.future.*;
-import org.apache.ignite.internal.util.typedef.*;
-import org.apache.ignite.internal.util.typedef.internal.*;
-import org.apache.ignite.lang.*;
-import org.jdk8.backport.*;
-import org.jetbrains.annotations.*;
-
-import javax.cache.event.*;
-import javax.cache.expiry.*;
-import javax.cache.processor.*;
-import java.io.*;
-import java.util.*;
-import java.util.concurrent.*;
-import java.util.concurrent.atomic.*;
-
-import static java.util.concurrent.TimeUnit.*;
-import static
org.apache.ignite.internal.processors.hadoop.GridHadoopJobPhase.*;
-import static
org.apache.ignite.internal.processors.hadoop.GridHadoopTaskType.*;
-import static
org.apache.ignite.internal.processors.hadoop.taskexecutor.GridHadoopTaskState.*;
-
-/**
- * Hadoop job tracker.
- */
-public class GridHadoopJobTracker extends GridHadoopComponent {
- /** */
- private final GridMutex mux = new GridMutex();
-
- /** */
- private volatile GridCacheProjectionEx<GridHadoopJobId,
GridHadoopJobMetadata> jobMetaPrj;
-
- /** Projection with expiry policy for finished job updates. */
- private volatile GridCacheProjectionEx<GridHadoopJobId,
GridHadoopJobMetadata> finishedJobMetaPrj;
-
- /** Map-reduce execution planner. */
- @SuppressWarnings("FieldAccessedSynchronizedAndUnsynchronized")
- private GridHadoopMapReducePlanner mrPlanner;
-
- /** All the known jobs. */
- private final ConcurrentMap<GridHadoopJobId,
GridFutureAdapterEx<GridHadoopJob>> jobs = new ConcurrentHashMap8<>();
-
- /** Locally active jobs. */
- private final ConcurrentMap<GridHadoopJobId, JobLocalState> activeJobs =
new ConcurrentHashMap8<>();
-
- /** Locally requested finish futures. */
- private final ConcurrentMap<GridHadoopJobId,
GridFutureAdapter<GridHadoopJobId>> activeFinishFuts =
- new ConcurrentHashMap8<>();
-
- /** Event processing service. */
- private ExecutorService evtProcSvc;
-
- /** Component busy lock. */
- private GridSpinReadWriteLock busyLock;
-
- /** Closure to check result of async transform of system cache. */
- private final IgniteInClosure<IgniteInternalFuture<?>> failsLog = new
CI1<IgniteInternalFuture<?>>() {
- @Override public void apply(IgniteInternalFuture<?> gridFut) {
- try {
- gridFut.get();
- }
- catch (IgniteCheckedException e) {
- U.error(log, "Failed to transform system cache.", e);
- }
- }
- };
-
- /** {@inheritDoc} */
- @Override public void start(GridHadoopContext ctx) throws
IgniteCheckedException {
- super.start(ctx);
-
- busyLock = new GridSpinReadWriteLock();
-
- evtProcSvc = Executors.newFixedThreadPool(1);
- }
-
- /**
- * @return Job meta projection.
- */
- @SuppressWarnings("NonPrivateFieldAccessedInSynchronizedContext")
- private GridCacheProjectionEx<GridHadoopJobId, GridHadoopJobMetadata>
jobMetaCache() {
- GridCacheProjectionEx<GridHadoopJobId, GridHadoopJobMetadata> prj =
jobMetaPrj;
-
- if (prj == null) {
- synchronized (mux) {
- if ((prj = jobMetaPrj) == null) {
- CacheProjection<Object, Object> sysCache =
ctx.kernalContext().cache()
- .cache(CU.SYS_CACHE_HADOOP_MR);
-
- assert sysCache != null;
-
- mrPlanner = ctx.planner();
-
- try {
-
ctx.kernalContext().resource().injectGeneric(mrPlanner);
- }
- catch (IgniteCheckedException e) { // Must not happen.
- U.error(log, "Failed to inject resources.", e);
-
- throw new IllegalStateException(e);
- }
-
- jobMetaPrj = prj = (GridCacheProjectionEx<GridHadoopJobId,
GridHadoopJobMetadata>)
- sysCache.projection(GridHadoopJobId.class,
GridHadoopJobMetadata.class);
-
- if (ctx.configuration().getFinishedJobInfoTtl() > 0) {
- ExpiryPolicy finishedJobPlc = new ModifiedExpiryPolicy(
- new Duration(MILLISECONDS,
ctx.configuration().getFinishedJobInfoTtl()));
-
- finishedJobMetaPrj =
prj.withExpiryPolicy(finishedJobPlc);
- }
- else
- finishedJobMetaPrj = jobMetaPrj;
- }
- }
- }
-
- return prj;
- }
-
- /**
- * @return Projection with expiry policy for finished job updates.
- */
- private GridCacheProjectionEx<GridHadoopJobId, GridHadoopJobMetadata>
finishedJobMetaCache() {
- GridCacheProjectionEx<GridHadoopJobId, GridHadoopJobMetadata> prj =
finishedJobMetaPrj;
-
- if (prj == null) {
- jobMetaCache();
-
- prj = finishedJobMetaPrj;
-
- assert prj != null;
- }
-
- return prj;
- }
-
- /** {@inheritDoc} */
- @SuppressWarnings("deprecation")
- @Override public void onKernalStart() throws IgniteCheckedException {
- super.onKernalStart();
-
- jobMetaCache().context().continuousQueries().executeInternalQuery(
- new CacheEntryUpdatedListener<GridHadoopJobId,
GridHadoopJobMetadata>() {
- @Override public void onUpdated(final
Iterable<CacheEntryEvent<? extends GridHadoopJobId,
- ? extends GridHadoopJobMetadata>> evts) {
- if (!busyLock.tryReadLock())
- return;
-
- try {
- // Must process query callback in a separate thread to
avoid deadlocks.
- evtProcSvc.submit(new EventHandler() {
- @Override protected void body() throws
IgniteCheckedException {
- processJobMetadataUpdates(evts);
- }
- });
- }
- finally {
- busyLock.readUnlock();
- }
- }
- },
- null,
- true,
- true
- );
-
- ctx.kernalContext().event().addLocalEventListener(new
GridLocalEventListener() {
- @Override public void onEvent(final Event evt) {
- if (!busyLock.tryReadLock())
- return;
-
- try {
- // Must process discovery callback in a separate thread to
avoid deadlock.
- evtProcSvc.submit(new EventHandler() {
- @Override protected void body() {
- processNodeLeft((DiscoveryEvent)evt);
- }
- });
- }
- finally {
- busyLock.readUnlock();
- }
- }
- }, EventType.EVT_NODE_FAILED, EventType.EVT_NODE_LEFT);
- }
-
- /** {@inheritDoc} */
- @Override public void onKernalStop(boolean cancel) {
- super.onKernalStop(cancel);
-
- busyLock.writeLock();
-
- evtProcSvc.shutdown();
-
- // Fail all pending futures.
- for (GridFutureAdapter<GridHadoopJobId> fut :
activeFinishFuts.values())
- fut.onDone(new IgniteCheckedException("Failed to execute Hadoop
map-reduce job (grid is stopping)."));
- }
-
- /**
- * Submits execution of Hadoop job to grid.
- *
- * @param jobId Job ID.
- * @param info Job info.
- * @return Job completion future.
- */
- @SuppressWarnings("unchecked")
- public IgniteInternalFuture<GridHadoopJobId> submit(GridHadoopJobId jobId,
GridHadoopJobInfo info) {
- if (!busyLock.tryReadLock()) {
- return new GridFinishedFutureEx<>(new
IgniteCheckedException("Failed to execute map-reduce job " +
- "(grid is stopping): " + info));
- }
-
- try {
- long jobPrepare = U.currentTimeMillis();
-
- if (jobs.containsKey(jobId) || jobMetaCache().containsKey(jobId))
- throw new IgniteCheckedException("Failed to submit job. Job
with the same ID already exists: " + jobId);
-
- GridHadoopJob job = job(jobId, info);
-
- GridHadoopMapReducePlan mrPlan = mrPlanner.preparePlan(job,
ctx.nodes(), null);
-
- GridHadoopJobMetadata meta = new
GridHadoopJobMetadata(ctx.localNodeId(), jobId, info);
-
- meta.mapReducePlan(mrPlan);
-
- meta.pendingSplits(allSplits(mrPlan));
- meta.pendingReducers(allReducers(mrPlan));
-
- GridFutureAdapter<GridHadoopJobId> completeFut = new
GridFutureAdapter<>();
-
- GridFutureAdapter<GridHadoopJobId> old =
activeFinishFuts.put(jobId, completeFut);
-
- assert old == null : "Duplicate completion future [jobId=" + jobId
+ ", old=" + old + ']';
-
- if (log.isDebugEnabled())
- log.debug("Submitting job metadata [jobId=" + jobId + ",
meta=" + meta + ']');
-
- long jobStart = U.currentTimeMillis();
-
- GridHadoopPerformanceCounter perfCntr =
GridHadoopPerformanceCounter.getCounter(meta.counters(),
- ctx.localNodeId());
-
- perfCntr.clientSubmissionEvents(info);
- perfCntr.onJobPrepare(jobPrepare);
- perfCntr.onJobStart(jobStart);
-
- if (jobMetaCache().putIfAbsent(jobId, meta) != null)
- throw new IgniteCheckedException("Failed to submit job. Job
with the same ID already exists: " + jobId);
-
- return completeFut;
- }
- catch (IgniteCheckedException e) {
- U.error(log, "Failed to submit job: " + jobId, e);
-
- return new GridFinishedFutureEx<>(e);
- }
- finally {
- busyLock.readUnlock();
- }
- }
-
- /**
- * Convert Hadoop job metadata to job status.
- *
- * @param meta Metadata.
- * @return Status.
- */
- @SuppressWarnings("ThrowableResultOfMethodCallIgnored")
- public static GridHadoopJobStatus status(GridHadoopJobMetadata meta) {
- GridHadoopJobInfo jobInfo = meta.jobInfo();
-
- return new GridHadoopJobStatus(
- meta.jobId(),
- jobInfo.jobName(),
- jobInfo.user(),
- meta.pendingSplits() != null ? meta.pendingSplits().size() : 0,
- meta.pendingReducers() != null ? meta.pendingReducers().size() : 0,
- meta.mapReducePlan().mappers(),
- meta.mapReducePlan().reducers(),
- meta.phase(),
- meta.failCause() != null,
- meta.version()
- );
- }
-
- /**
- * Gets hadoop job status for given job ID.
- *
- * @param jobId Job ID to get status for.
- * @return Job status for given job ID or {@code null} if job was not
found.
- */
- @Nullable public GridHadoopJobStatus status(GridHadoopJobId jobId) throws
IgniteCheckedException {
- if (!busyLock.tryReadLock())
- return null; // Grid is stopping.
-
- try {
- GridHadoopJobMetadata meta = jobMetaCache().get(jobId);
-
- return meta != null ? status(meta) : null;
- }
- finally {
- busyLock.readUnlock();
- }
- }
-
- /**
- * Gets job finish future.
- *
- * @param jobId Job ID.
- * @return Finish future or {@code null}.
- * @throws IgniteCheckedException If failed.
- */
- @Nullable public IgniteInternalFuture<?> finishFuture(GridHadoopJobId
jobId) throws IgniteCheckedException {
- if (!busyLock.tryReadLock())
- return null; // Grid is stopping.
-
- try {
- GridHadoopJobMetadata meta = jobMetaCache().get(jobId);
-
- if (meta == null)
- return null;
-
- if (log.isTraceEnabled())
- log.trace("Got job metadata for status check [locNodeId=" +
ctx.localNodeId() + ", meta=" + meta + ']');
-
- if (meta.phase() == PHASE_COMPLETE) {
- if (log.isTraceEnabled())
- log.trace("Job is complete, returning finished future: " +
jobId);
-
- return new GridFinishedFutureEx<>(jobId, meta.failCause());
- }
-
- GridFutureAdapter<GridHadoopJobId> fut =
F.addIfAbsent(activeFinishFuts, jobId,
- new GridFutureAdapter<GridHadoopJobId>());
-
- // Get meta from cache one more time to close the window.
- meta = jobMetaCache().get(jobId);
-
- if (log.isTraceEnabled())
- log.trace("Re-checking job metadata [locNodeId=" +
ctx.localNodeId() + ", meta=" + meta + ']');
-
- if (meta == null) {
- fut.onDone();
-
- activeFinishFuts.remove(jobId , fut);
- }
- else if (meta.phase() == PHASE_COMPLETE) {
- fut.onDone(jobId, meta.failCause());
-
- activeFinishFuts.remove(jobId , fut);
- }
-
- return fut;
- }
- finally {
- busyLock.readUnlock();
- }
- }
-
- /**
- * Gets job plan by job ID.
- *
- * @param jobId Job ID.
- * @return Job plan.
- * @throws IgniteCheckedException If failed.
- */
- public GridHadoopMapReducePlan plan(GridHadoopJobId jobId) throws
IgniteCheckedException {
- if (!busyLock.tryReadLock())
- return null;
-
- try {
- GridHadoopJobMetadata meta = jobMetaCache().get(jobId);
-
- if (meta != null)
- return meta.mapReducePlan();
-
- return null;
- }
- finally {
- busyLock.readUnlock();
- }
- }
-
- /**
- * Callback from task executor invoked when a task has been finished.
- *
- * @param info Task info.
- * @param status Task status.
- */
- @SuppressWarnings({"ConstantConditions",
"ThrowableResultOfMethodCallIgnored"})
- public void onTaskFinished(GridHadoopTaskInfo info, GridHadoopTaskStatus
status) {
- if (!busyLock.tryReadLock())
- return;
-
- try {
- assert status.state() != RUNNING;
-
- if (log.isDebugEnabled())
- log.debug("Received task finished callback [info=" + info + ",
status=" + status + ']');
-
- JobLocalState state = activeJobs.get(info.jobId());
-
- // Task CRASHes with null fail cause.
- assert (status.state() != FAILED) || status.failCause() != null :
- "Invalid task status [info=" + info + ", status=" + status +
']';
-
- assert state != null || (ctx.jobUpdateLeader() && (info.type() ==
COMMIT || info.type() == ABORT)):
- "Missing local state for finished task [info=" + info + ",
status=" + status + ']';
-
- StackedProcessor incrCntrs = null;
-
- if (status.state() == COMPLETED)
- incrCntrs = new IncrementCountersProcessor(null,
status.counters());
-
- switch (info.type()) {
- case SETUP: {
- state.onSetupFinished(info, status, incrCntrs);
-
- break;
- }
-
- case MAP: {
- state.onMapFinished(info, status, incrCntrs);
-
- break;
- }
-
- case REDUCE: {
- state.onReduceFinished(info, status, incrCntrs);
-
- break;
- }
-
- case COMBINE: {
- state.onCombineFinished(info, status, incrCntrs);
-
- break;
- }
-
- case COMMIT:
- case ABORT: {
- GridCacheProjectionEx<GridHadoopJobId,
GridHadoopJobMetadata> cache = finishedJobMetaCache();
-
- cache.invokeAsync(info.jobId(), new
UpdatePhaseProcessor(incrCntrs, PHASE_COMPLETE)).
- listenAsync(failsLog);
-
- break;
- }
- }
- }
- finally {
- busyLock.readUnlock();
- }
- }
-
- /**
- * @param jobId Job id.
- * @param c Closure of operation.
- */
- private void transform(GridHadoopJobId jobId,
EntryProcessor<GridHadoopJobId, GridHadoopJobMetadata, Void> c) {
- jobMetaCache().invokeAsync(jobId, c).listenAsync(failsLog);
- }
-
- /**
- * Callback from task executor called when process is ready to received
shuffle messages.
- *
- * @param jobId Job ID.
- * @param reducers Reducers.
- * @param desc Process descriptor.
- */
- public void onExternalMappersInitialized(GridHadoopJobId jobId,
Collection<Integer> reducers,
- GridHadoopProcessDescriptor desc) {
- transform(jobId, new InitializeReducersProcessor(null, reducers,
desc));
- }
-
- /**
- * Gets all input splits for given hadoop map-reduce plan.
- *
- * @param plan Map-reduce plan.
- * @return Collection of all input splits that should be processed.
- */
- @SuppressWarnings("ConstantConditions")
- private Map<GridHadoopInputSplit, Integer>
allSplits(GridHadoopMapReducePlan plan) {
- Map<GridHadoopInputSplit, Integer> res = new HashMap<>();
-
- int taskNum = 0;
-
- for (UUID nodeId : plan.mapperNodeIds()) {
- for (GridHadoopInputSplit split : plan.mappers(nodeId)) {
- if (res.put(split, taskNum++) != null)
- throw new IllegalStateException("Split duplicate.");
- }
- }
-
- return res;
- }
-
- /**
- * Gets all reducers for this job.
- *
- * @param plan Map-reduce plan.
- * @return Collection of reducers.
- */
- private Collection<Integer> allReducers(GridHadoopMapReducePlan plan) {
- Collection<Integer> res = new HashSet<>();
-
- for (int i = 0; i < plan.reducers(); i++)
- res.add(i);
-
- return res;
- }
-
- /**
- * Processes node leave (or fail) event.
- *
- * @param evt Discovery event.
- */
- @SuppressWarnings("ConstantConditions")
- private void processNodeLeft(DiscoveryEvent evt) {
- if (log.isDebugEnabled())
- log.debug("Processing discovery event [locNodeId=" +
ctx.localNodeId() + ", evt=" + evt + ']');
-
- // Check only if this node is responsible for job status updates.
- if (ctx.jobUpdateLeader()) {
- boolean checkSetup = evt.eventNode().order() <
ctx.localNodeOrder();
-
- // Iteration over all local entries is correct since system cache
is REPLICATED.
- for (Object metaObj : jobMetaCache().values()) {
- GridHadoopJobMetadata meta = (GridHadoopJobMetadata)metaObj;
-
- GridHadoopJobId jobId = meta.jobId();
-
- GridHadoopMapReducePlan plan = meta.mapReducePlan();
-
- GridHadoopJobPhase phase = meta.phase();
-
- try {
- if (checkSetup && phase == PHASE_SETUP &&
!activeJobs.containsKey(jobId)) {
- // Failover setup task.
- GridHadoopJob job = job(jobId, meta.jobInfo());
-
- Collection<GridHadoopTaskInfo> setupTask =
setupTask(jobId);
-
- assert setupTask != null;
-
- ctx.taskExecutor().run(job, setupTask);
- }
- else if (phase == PHASE_MAP || phase == PHASE_REDUCE) {
- // Must check all nodes, even that are not event node
ID due to
- // multiple node failure possibility.
- Collection<GridHadoopInputSplit> cancelSplits = null;
-
- for (UUID nodeId : plan.mapperNodeIds()) {
- if (ctx.kernalContext().discovery().node(nodeId)
== null) {
- // Node has left the grid.
- Collection<GridHadoopInputSplit> mappers =
plan.mappers(nodeId);
-
- if (cancelSplits == null)
- cancelSplits = new HashSet<>();
-
- cancelSplits.addAll(mappers);
- }
- }
-
- Collection<Integer> cancelReducers = null;
-
- for (UUID nodeId : plan.reducerNodeIds()) {
- if (ctx.kernalContext().discovery().node(nodeId)
== null) {
- // Node has left the grid.
- int[] reducers = plan.reducers(nodeId);
-
- if (cancelReducers == null)
- cancelReducers = new HashSet<>();
-
- for (int rdc : reducers)
- cancelReducers.add(rdc);
- }
- }
-
- if (cancelSplits != null || cancelReducers != null)
- jobMetaCache().invoke(meta.jobId(), new
CancelJobProcessor(null, new IgniteCheckedException(
- "One or more nodes participating in map-reduce
job execution failed."), cancelSplits,
- cancelReducers));
- }
- }
- catch (IgniteCheckedException e) {
- U.error(log, "Failed to cancel job: " + meta, e);
- }
- }
- }
- }
-
- /**
- * @param updated Updated cache entries.
- * @throws IgniteCheckedException If failed.
- */
- private void processJobMetadataUpdates(
- Iterable<CacheEntryEvent<? extends GridHadoopJobId, ? extends
GridHadoopJobMetadata>> updated)
- throws IgniteCheckedException {
- UUID locNodeId = ctx.localNodeId();
-
- for (CacheEntryEvent<? extends GridHadoopJobId, ? extends
GridHadoopJobMetadata> entry : updated) {
- GridHadoopJobId jobId = entry.getKey();
- GridHadoopJobMetadata meta = entry.getValue();
-
- if (meta == null || !ctx.isParticipating(meta))
- continue;
-
- if (log.isDebugEnabled())
- log.debug("Processing job metadata update callback
[locNodeId=" + locNodeId +
- ", meta=" + meta + ']');
-
- try {
- ctx.taskExecutor().onJobStateChanged(meta);
- }
- catch (IgniteCheckedException e) {
- U.error(log, "Failed to process job state changed callback
(will fail the job) " +
- "[locNodeId=" + locNodeId + ", jobId=" + jobId + ", meta="
+ meta + ']', e);
-
- transform(jobId, new CancelJobProcessor(null, e));
-
- continue;
- }
-
- processJobMetaUpdate(jobId, meta, locNodeId);
- }
- }
-
- /**
- * @param jobId Job ID.
- * @param plan Map-reduce plan.
- */
- private void printPlan(GridHadoopJobId jobId, GridHadoopMapReducePlan
plan) {
- log.info("Plan for " + jobId);
-
- SB b = new SB();
-
- b.a(" Map: ");
-
- for (UUID nodeId : plan.mapperNodeIds())
- b.a(nodeId).a("=").a(plan.mappers(nodeId).size()).a(' ');
-
- log.info(b.toString());
-
- b = new SB();
-
- b.a(" Reduce: ");
-
- for (UUID nodeId : plan.reducerNodeIds())
- b.a(nodeId).a("=").a(Arrays.toString(plan.reducers(nodeId))).a('
');
-
- log.info(b.toString());
- }
-
- /**
- * @param jobId Job ID.
- * @param meta Job metadata.
- * @param locNodeId Local node ID.
- * @throws IgniteCheckedException If failed.
- */
- private void processJobMetaUpdate(GridHadoopJobId jobId,
GridHadoopJobMetadata meta, UUID locNodeId)
- throws IgniteCheckedException {
- JobLocalState state = activeJobs.get(jobId);
-
- GridHadoopJob job = job(jobId, meta.jobInfo());
-
- GridHadoopMapReducePlan plan = meta.mapReducePlan();
-
- switch (meta.phase()) {
- case PHASE_SETUP: {
- if (ctx.jobUpdateLeader()) {
- Collection<GridHadoopTaskInfo> setupTask =
setupTask(jobId);
-
- if (setupTask != null)
- ctx.taskExecutor().run(job, setupTask);
- }
-
- break;
- }
-
- case PHASE_MAP: {
- // Check if we should initiate new task on local node.
- Collection<GridHadoopTaskInfo> tasks =
mapperTasks(plan.mappers(locNodeId), meta);
-
- if (tasks != null)
- ctx.taskExecutor().run(job, tasks);
-
- break;
- }
-
- case PHASE_REDUCE: {
- if (meta.pendingReducers().isEmpty() && ctx.jobUpdateLeader())
{
- GridHadoopTaskInfo info = new GridHadoopTaskInfo(COMMIT,
jobId, 0, 0, null);
-
- if (log.isDebugEnabled())
- log.debug("Submitting COMMIT task for execution
[locNodeId=" + locNodeId +
- ", jobId=" + jobId + ']');
-
- ctx.taskExecutor().run(job,
Collections.singletonList(info));
-
- break;
- }
-
- Collection<GridHadoopTaskInfo> tasks =
reducerTasks(plan.reducers(locNodeId), job);
-
- if (tasks != null)
- ctx.taskExecutor().run(job, tasks);
-
- break;
- }
-
- case PHASE_CANCELLING: {
- // Prevent multiple task executor notification.
- if (state != null && state.onCancel()) {
- if (log.isDebugEnabled())
- log.debug("Cancelling local task execution for job: "
+ meta);
-
- ctx.taskExecutor().cancelTasks(jobId);
- }
-
- if (meta.pendingSplits().isEmpty() &&
meta.pendingReducers().isEmpty()) {
- if (ctx.jobUpdateLeader()) {
- if (state == null)
- state = initState(jobId);
-
- // Prevent running multiple abort tasks.
- if (state.onAborted()) {
- GridHadoopTaskInfo info = new
GridHadoopTaskInfo(ABORT, jobId, 0, 0, null);
-
- if (log.isDebugEnabled())
- log.debug("Submitting ABORT task for execution
[locNodeId=" + locNodeId +
- ", jobId=" + jobId + ']');
-
- ctx.taskExecutor().run(job,
Collections.singletonList(info));
- }
- }
-
- break;
- }
- else {
- // Check if there are unscheduled mappers or reducers.
- Collection<GridHadoopInputSplit> cancelMappers = new
ArrayList<>();
- Collection<Integer> cancelReducers = new ArrayList<>();
-
- Collection<GridHadoopInputSplit> mappers =
plan.mappers(ctx.localNodeId());
-
- if (mappers != null) {
- for (GridHadoopInputSplit b : mappers) {
- if (state == null || !state.mapperScheduled(b))
- cancelMappers.add(b);
- }
- }
-
- int[] rdc = plan.reducers(ctx.localNodeId());
-
- if (rdc != null) {
- for (int r : rdc) {
- if (state == null || !state.reducerScheduled(r))
- cancelReducers.add(r);
- }
- }
-
- if (!cancelMappers.isEmpty() || !cancelReducers.isEmpty())
- transform(jobId, new CancelJobProcessor(null,
cancelMappers, cancelReducers));
- }
-
- break;
- }
-
- case PHASE_COMPLETE: {
- if (log.isDebugEnabled())
- log.debug("Job execution is complete, will remove local
state from active jobs " +
- "[jobId=" + jobId + ", meta=" + meta + ']');
-
- if (state != null) {
- state = activeJobs.remove(jobId);
-
- assert state != null;
-
- ctx.shuffle().jobFinished(jobId);
- }
-
- GridFutureAdapter<GridHadoopJobId> finishFut =
activeFinishFuts.remove(jobId);
-
- if (finishFut != null) {
- if (log.isDebugEnabled())
- log.debug("Completing job future [locNodeId=" +
locNodeId + ", meta=" + meta + ']');
-
- finishFut.onDone(jobId, meta.failCause());
- }
-
- if (ctx.jobUpdateLeader())
- job.cleanupStagingDirectory();
-
- jobs.remove(jobId);
-
- job.dispose(false);
-
- if (ctx.jobUpdateLeader()) {
- ClassLoader ldr = job.getClass().getClassLoader();
-
- try {
- String statWriterClsName =
job.info().property(GridHadoopUtils.JOB_COUNTER_WRITER_PROPERTY);
-
- if (statWriterClsName != null) {
- Class<?> cls = ldr.loadClass(statWriterClsName);
-
- GridHadoopCounterWriter writer =
(GridHadoopCounterWriter)cls.newInstance();
-
- GridHadoopCounters cntrs = meta.counters();
-
- writer.write(job.info(), jobId, cntrs);
- }
- }
- catch (Exception e) {
- log.error("Can't write statistic due to: ", e);
- }
- }
-
- break;
- }
-
- default:
- throw new IllegalStateException("Unknown phase: " +
meta.phase());
- }
- }
-
- /**
- * Creates setup task based on job information.
- *
- * @param jobId Job ID.
- * @return Setup task wrapped in collection.
- */
- @Nullable private Collection<GridHadoopTaskInfo> setupTask(GridHadoopJobId
jobId) {
- if (activeJobs.containsKey(jobId))
- return null;
- else {
- initState(jobId);
-
- return Collections.singleton(new GridHadoopTaskInfo(SETUP, jobId,
0, 0, null));
- }
- }
-
- /**
- * Creates mapper tasks based on job information.
- *
- * @param mappers Mapper blocks.
- * @param meta Job metadata.
- * @return Collection of created task infos or {@code null} if no mapper
tasks scheduled for local node.
- */
- private Collection<GridHadoopTaskInfo>
mapperTasks(Iterable<GridHadoopInputSplit> mappers, GridHadoopJobMetadata meta)
{
- UUID locNodeId = ctx.localNodeId();
- GridHadoopJobId jobId = meta.jobId();
-
- JobLocalState state = activeJobs.get(jobId);
-
- Collection<GridHadoopTaskInfo> tasks = null;
-
- if (mappers != null) {
- if (state == null)
- state = initState(jobId);
-
- for (GridHadoopInputSplit split : mappers) {
- if (state.addMapper(split)) {
- if (log.isDebugEnabled())
- log.debug("Submitting MAP task for execution
[locNodeId=" + locNodeId +
- ", split=" + split + ']');
-
- GridHadoopTaskInfo taskInfo = new GridHadoopTaskInfo(MAP,
jobId, meta.taskNumber(split), 0, split);
-
- if (tasks == null)
- tasks = new ArrayList<>();
-
- tasks.add(taskInfo);
- }
- }
- }
-
- return tasks;
- }
-
- /**
- * Creates reducer tasks based on job information.
- *
- * @param reducers Reducers (may be {@code null}).
- * @param job Job instance.
- * @return Collection of task infos.
- */
- private Collection<GridHadoopTaskInfo> reducerTasks(int[] reducers,
GridHadoopJob job) {
- UUID locNodeId = ctx.localNodeId();
- GridHadoopJobId jobId = job.id();
-
- JobLocalState state = activeJobs.get(jobId);
-
- Collection<GridHadoopTaskInfo> tasks = null;
-
- if (reducers != null) {
- if (state == null)
- state = initState(job.id());
-
- for (int rdc : reducers) {
- if (state.addReducer(rdc)) {
- if (log.isDebugEnabled())
- log.debug("Submitting REDUCE task for execution
[locNodeId=" + locNodeId +
- ", rdc=" + rdc + ']');
-
- GridHadoopTaskInfo taskInfo = new
GridHadoopTaskInfo(REDUCE, jobId, rdc, 0, null);
-
- if (tasks == null)
- tasks = new ArrayList<>();
-
- tasks.add(taskInfo);
- }
- }
- }
-
- return tasks;
- }
-
- /**
- * Initializes local state for given job metadata.
- *
- * @param jobId Job ID.
- * @return Local state.
- */
- private JobLocalState initState(GridHadoopJobId jobId) {
- return F.addIfAbsent(activeJobs, jobId, new JobLocalState());
- }
-
- /**
- * Gets or creates job instance.
- *
- * @param jobId Job ID.
- * @param jobInfo Job info.
- * @return Job.
- * @throws IgniteCheckedException If failed.
- */
- @Nullable public GridHadoopJob job(GridHadoopJobId jobId, @Nullable
GridHadoopJobInfo jobInfo) throws IgniteCheckedException {
- GridFutureAdapterEx<GridHadoopJob> fut = jobs.get(jobId);
-
- if (fut != null || (fut = jobs.putIfAbsent(jobId, new
GridFutureAdapterEx<GridHadoopJob>())) != null)
- return fut.get();
-
- fut = jobs.get(jobId);
-
- GridHadoopJob job = null;
-
- try {
- if (jobInfo == null) {
- GridHadoopJobMetadata meta = jobMetaCache().get(jobId);
-
- if (meta == null)
- throw new IgniteCheckedException("Failed to find job
metadata for ID: " + jobId);
-
- jobInfo = meta.jobInfo();
- }
-
- job = jobInfo.createJob(jobId, log);
-
- job.initialize(false, ctx.localNodeId());
-
- fut.onDone(job);
-
- return job;
- }
- catch (IgniteCheckedException e) {
- fut.onDone(e);
-
- jobs.remove(jobId, fut);
-
- if (job != null) {
- try {
- job.dispose(false);
- }
- catch (IgniteCheckedException e0) {
- U.error(log, "Failed to dispose job: " + jobId, e0);
- }
- }
-
- throw e;
- }
- }
-
- /**
- * Kills job.
- *
- * @param jobId Job ID.
- * @return {@code True} if job was killed.
- * @throws IgniteCheckedException If failed.
- */
- public boolean killJob(GridHadoopJobId jobId) throws
IgniteCheckedException {
- if (!busyLock.tryReadLock())
- return false; // Grid is stopping.
-
- try {
- GridHadoopJobMetadata meta = jobMetaCache().get(jobId);
-
- if (meta != null && meta.phase() != PHASE_COMPLETE && meta.phase()
!= PHASE_CANCELLING) {
- GridHadoopTaskCancelledException err = new
GridHadoopTaskCancelledException("Job cancelled.");
-
- jobMetaCache().invoke(jobId, new CancelJobProcessor(null,
err));
- }
- }
- finally {
- busyLock.readUnlock();
- }
-
- IgniteInternalFuture<?> fut = finishFuture(jobId);
-
- if (fut != null) {
- try {
- fut.get();
- }
- catch (Throwable e) {
- if (e.getCause() instanceof GridHadoopTaskCancelledException)
- return true;
- }
- }
-
- return false;
- }
-
- /**
- * Returns job counters.
- *
- * @param jobId Job identifier.
- * @return Job counters or {@code null} if job cannot be found.
- * @throws IgniteCheckedException If failed.
- */
- @Nullable public GridHadoopCounters jobCounters(GridHadoopJobId jobId)
throws IgniteCheckedException {
- if (!busyLock.tryReadLock())
- return null;
-
- try {
- final GridHadoopJobMetadata meta = jobMetaCache().get(jobId);
-
- return meta != null ? meta.counters() : null;
- }
- finally {
- busyLock.readUnlock();
- }
- }
-
- /**
- * Event handler protected by busy lock.
- */
- private abstract class EventHandler implements Runnable {
- /** {@inheritDoc} */
- @Override public void run() {
- if (!busyLock.tryReadLock())
- return;
-
- try {
- body();
- }
- catch (Throwable e) {
- U.error(log, "Unhandled exception while processing event.", e);
- }
- finally {
- busyLock.readUnlock();
- }
- }
-
- /**
- * Handler body.
- */
- protected abstract void body() throws Exception;
- }
-
- /**
- *
- */
- private class JobLocalState {
- /** Mappers. */
- private final Collection<GridHadoopInputSplit> currMappers = new
HashSet<>();
-
- /** Reducers. */
- private final Collection<Integer> currReducers = new HashSet<>();
-
- /** Number of completed mappers. */
- private final AtomicInteger completedMappersCnt = new AtomicInteger();
-
- /** Cancelled flag. */
- private boolean cancelled;
-
- /** Aborted flag. */
- private boolean aborted;
-
- /**
- * @param mapSplit Map split to add.
- * @return {@code True} if mapper was added.
- */
- private boolean addMapper(GridHadoopInputSplit mapSplit) {
- return currMappers.add(mapSplit);
- }
-
- /**
- * @param rdc Reducer number to add.
- * @return {@code True} if reducer was added.
- */
- private boolean addReducer(int rdc) {
- return currReducers.add(rdc);
- }
-
- /**
- * Checks whether this split was scheduled for given attempt.
- *
- * @param mapSplit Map split to check.
- * @return {@code True} if mapper was scheduled.
- */
- public boolean mapperScheduled(GridHadoopInputSplit mapSplit) {
- return currMappers.contains(mapSplit);
- }
-
- /**
- * Checks whether this split was scheduled for given attempt.
- *
- * @param rdc Reducer number to check.
- * @return {@code True} if reducer was scheduled.
- */
- public boolean reducerScheduled(int rdc) {
- return currReducers.contains(rdc);
- }
-
- /**
- * @param taskInfo Task info.
- * @param status Task status.
- * @param prev Previous closure.
- */
- private void onSetupFinished(final GridHadoopTaskInfo taskInfo,
GridHadoopTaskStatus status, StackedProcessor prev) {
- final GridHadoopJobId jobId = taskInfo.jobId();
-
- if (status.state() == FAILED || status.state() == CRASHED)
- transform(jobId, new CancelJobProcessor(prev,
status.failCause()));
- else
- transform(jobId, new UpdatePhaseProcessor(prev, PHASE_MAP));
- }
-
- /**
- * @param taskInfo Task info.
- * @param status Task status.
- * @param prev Previous closure.
- */
- private void onMapFinished(final GridHadoopTaskInfo taskInfo,
GridHadoopTaskStatus status,
- final StackedProcessor prev) {
- final GridHadoopJobId jobId = taskInfo.jobId();
-
- boolean lastMapperFinished = completedMappersCnt.incrementAndGet()
== currMappers.size();
-
- if (status.state() == FAILED || status.state() == CRASHED) {
- // Fail the whole job.
- transform(jobId, new RemoveMappersProcessor(prev,
taskInfo.inputSplit(), status.failCause()));
-
- return;
- }
-
- IgniteInClosure<IgniteInternalFuture<?>> cacheUpdater = new
CIX1<IgniteInternalFuture<?>>() {
- @Override public void applyx(IgniteInternalFuture<?> f) {
- Throwable err = null;
-
- if (f != null) {
- try {
- f.get();
- }
- catch (IgniteCheckedException e) {
- err = e;
- }
- }
-
- transform(jobId, new RemoveMappersProcessor(prev,
taskInfo.inputSplit(), err));
- }
- };
-
- if (lastMapperFinished)
- ctx.shuffle().flush(jobId).listenAsync(cacheUpdater);
- else
- cacheUpdater.apply(null);
- }
-
- /**
- * @param taskInfo Task info.
- * @param status Task status.
- * @param prev Previous closure.
- */
- private void onReduceFinished(GridHadoopTaskInfo taskInfo,
GridHadoopTaskStatus status, StackedProcessor prev) {
- GridHadoopJobId jobId = taskInfo.jobId();
- if (status.state() == FAILED || status.state() == CRASHED)
- // Fail the whole job.
- transform(jobId, new RemoveReducerProcessor(prev,
taskInfo.taskNumber(), status.failCause()));
- else
- transform(jobId, new RemoveReducerProcessor(prev,
taskInfo.taskNumber()));
- }
-
- /**
- * @param taskInfo Task info.
- * @param status Task status.
- * @param prev Previous closure.
- */
- private void onCombineFinished(GridHadoopTaskInfo taskInfo,
GridHadoopTaskStatus status,
- final StackedProcessor prev) {
- final GridHadoopJobId jobId = taskInfo.jobId();
-
- if (status.state() == FAILED || status.state() == CRASHED)
- // Fail the whole job.
- transform(jobId, new RemoveMappersProcessor(prev, currMappers,
status.failCause()));
- else {
- ctx.shuffle().flush(jobId).listenAsync(new
CIX1<IgniteInternalFuture<?>>() {
- @Override public void applyx(IgniteInternalFuture<?> f) {
- Throwable err = null;
-
- if (f != null) {
- try {
- f.get();
- }
- catch (IgniteCheckedException e) {
- err = e;
- }
- }
-
- transform(jobId, new RemoveMappersProcessor(prev,
currMappers, err));
- }
- });
- }
- }
-
- /**
- * @return {@code True} if job was cancelled by this (first) call.
- */
- public boolean onCancel() {
- if (!cancelled && !aborted) {
- cancelled = true;
-
- return true;
- }
-
- return false;
- }
-
- /**
- * @return {@code True} if job was aborted this (first) call.
- */
- public boolean onAborted() {
- if (!aborted) {
- aborted = true;
-
- return true;
- }
-
- return false;
- }
- }
-
- /**
- * Update job phase transform closure.
- */
- private static class UpdatePhaseProcessor extends StackedProcessor {
- /** */
- private static final long serialVersionUID = 0L;
-
- /** Phase to update. */
- private final GridHadoopJobPhase phase;
-
- /**
- * @param prev Previous closure.
- * @param phase Phase to update.
- */
- private UpdatePhaseProcessor(@Nullable StackedProcessor prev,
GridHadoopJobPhase phase) {
- super(prev);
-
- this.phase = phase;
- }
-
- /** {@inheritDoc} */
- @Override protected void update(GridHadoopJobMetadata meta,
GridHadoopJobMetadata cp) {
- cp.phase(phase);
- }
- }
-
- /**
- * Remove mapper transform closure.
- */
- private static class RemoveMappersProcessor extends StackedProcessor {
- /** */
- private static final long serialVersionUID = 0L;
-
- /** Mapper split to remove. */
- private final Collection<GridHadoopInputSplit> splits;
-
- /** Error. */
- private final Throwable err;
-
- /**
- * @param prev Previous closure.
- * @param split Mapper split to remove.
- * @param err Error.
- */
- private RemoveMappersProcessor(@Nullable StackedProcessor prev,
GridHadoopInputSplit split, Throwable err) {
- this(prev, Collections.singletonList(split), err);
- }
-
- /**
- * @param prev Previous closure.
- * @param splits Mapper splits to remove.
- * @param err Error.
- */
- private RemoveMappersProcessor(@Nullable StackedProcessor prev,
Collection<GridHadoopInputSplit> splits,
- Throwable err) {
- super(prev);
-
- this.splits = splits;
- this.err = err;
- }
-
- /** {@inheritDoc} */
- @Override protected void update(GridHadoopJobMetadata meta,
GridHadoopJobMetadata cp) {
- Map<GridHadoopInputSplit, Integer> splitsCp = new
HashMap<>(cp.pendingSplits());
-
- for (GridHadoopInputSplit s : splits)
- splitsCp.remove(s);
-
- cp.pendingSplits(splitsCp);
-
- if (cp.phase() != PHASE_CANCELLING && err != null)
- cp.failCause(err);
-
- if (err != null)
- cp.phase(PHASE_CANCELLING);
-
- if (splitsCp.isEmpty()) {
- if (cp.phase() != PHASE_CANCELLING)
- cp.phase(PHASE_REDUCE);
- }
- }
- }
-
- /**
- * Remove reducer transform closure.
- */
- private static class RemoveReducerProcessor extends StackedProcessor {
- /** */
- private static final long serialVersionUID = 0L;
-
- /** Mapper split to remove. */
- private final int rdc;
-
- /** Error. */
- private Throwable err;
-
- /**
- * @param prev Previous closure.
- * @param rdc Reducer to remove.
- */
- private RemoveReducerProcessor(@Nullable StackedProcessor prev, int
rdc) {
- super(prev);
-
- this.rdc = rdc;
- }
-
- /**
- * @param prev Previous closure.
- * @param rdc Reducer to remove.
- * @param err Error.
- */
- private RemoveReducerProcessor(@Nullable StackedProcessor prev, int
rdc, Throwable err) {
- super(prev);
-
- this.rdc = rdc;
- this.err = err;
- }
-
- /** {@inheritDoc} */
- @Override protected void update(GridHadoopJobMetadata meta,
GridHadoopJobMetadata cp) {
- Collection<Integer> rdcCp = new HashSet<>(cp.pendingReducers());
-
- rdcCp.remove(rdc);
-
- cp.pendingReducers(rdcCp);
-
- if (err != null) {
- cp.phase(PHASE_CANCELLING);
- cp.failCause(err);
- }
- }
- }
-
- /**
- * Initialize reducers.
- */
- private static class InitializeReducersProcessor extends StackedProcessor {
- /** */
- private static final long serialVersionUID = 0L;
-
- /** Reducers. */
- private final Collection<Integer> rdc;
-
- /** Process descriptor for reducers. */
- private final GridHadoopProcessDescriptor desc;
-
- /**
- * @param prev Previous closure.
- * @param rdc Reducers to initialize.
- * @param desc External process descriptor.
- */
- private InitializeReducersProcessor(@Nullable StackedProcessor prev,
- Collection<Integer> rdc,
- GridHadoopProcessDescriptor desc) {
- super(prev);
-
- assert !F.isEmpty(rdc);
- assert desc != null;
-
- this.rdc = rdc;
- this.desc = desc;
- }
-
- /** {@inheritDoc} */
- @Override protected void update(GridHadoopJobMetadata meta,
GridHadoopJobMetadata cp) {
- Map<Integer, GridHadoopProcessDescriptor> oldMap =
meta.reducersAddresses();
-
- Map<Integer, GridHadoopProcessDescriptor> rdcMap = oldMap == null ?
- new HashMap<Integer, GridHadoopProcessDescriptor>() : new
HashMap<>(oldMap);
-
- for (Integer r : rdc)
- rdcMap.put(r, desc);
-
- cp.reducersAddresses(rdcMap);
- }
- }
-
- /**
- * Remove reducer transform closure.
- */
- private static class CancelJobProcessor extends StackedProcessor {
- /** */
- private static final long serialVersionUID = 0L;
-
- /** Mapper split to remove. */
- private final Collection<GridHadoopInputSplit> splits;
-
- /** Reducers to remove. */
- private final Collection<Integer> rdc;
-
- /** Error. */
- private final Throwable err;
-
- /**
- * @param prev Previous closure.
- * @param err Fail cause.
- */
- private CancelJobProcessor(@Nullable StackedProcessor prev, Throwable
err) {
- this(prev, err, null, null);
- }
-
- /**
- * @param prev Previous closure.
- * @param splits Splits to remove.
- * @param rdc Reducers to remove.
- */
- private CancelJobProcessor(@Nullable StackedProcessor prev,
- Collection<GridHadoopInputSplit> splits,
- Collection<Integer> rdc) {
- this(prev, null, splits, rdc);
- }
-
- /**
- * @param prev Previous closure.
- * @param err Error.
- * @param splits Splits to remove.
- * @param rdc Reducers to remove.
- */
- private CancelJobProcessor(@Nullable StackedProcessor prev,
- Throwable err,
- Collection<GridHadoopInputSplit> splits,
- Collection<Integer> rdc) {
- super(prev);
-
- this.splits = splits;
- this.rdc = rdc;
- this.err = err;
- }
-
- /** {@inheritDoc} */
- @Override protected void update(GridHadoopJobMetadata meta,
GridHadoopJobMetadata cp) {
- assert meta.phase() == PHASE_CANCELLING || err != null: "Invalid
phase for cancel: " + meta;
-
- Collection<Integer> rdcCp = new HashSet<>(cp.pendingReducers());
-
- if (rdc != null)
- rdcCp.removeAll(rdc);
-
- cp.pendingReducers(rdcCp);
-
- Map<GridHadoopInputSplit, Integer> splitsCp = new
HashMap<>(cp.pendingSplits());
-
- if (splits != null) {
- for (GridHadoopInputSplit s : splits)
- splitsCp.remove(s);
- }
-
- cp.pendingSplits(splitsCp);
-
- cp.phase(PHASE_CANCELLING);
-
- if (err != null)
- cp.failCause(err);
- }
- }
-
- /**
- * Increment counter values closure.
- */
- private static class IncrementCountersProcessor extends StackedProcessor {
- /** */
- private static final long serialVersionUID = 0L;
-
- /** */
- private final GridHadoopCounters counters;
-
- /**
- * @param prev Previous closure.
- * @param counters Task counters to add into job counters.
- */
- private IncrementCountersProcessor(@Nullable StackedProcessor prev,
GridHadoopCounters counters) {
- super(prev);
-
- assert counters != null;
-
- this.counters = counters;
- }
-
- /** {@inheritDoc} */
- @Override protected void update(GridHadoopJobMetadata meta,
GridHadoopJobMetadata cp) {
- GridHadoopCounters cntrs = new
GridHadoopCountersImpl(cp.counters());
-
- cntrs.merge(counters);
-
- cp.counters(cntrs);
- }
- }
-
- /**
- * Abstract stacked closure.
- */
- private abstract static class StackedProcessor implements
- EntryProcessor<GridHadoopJobId, GridHadoopJobMetadata, Void>,
Serializable {
- /** */
- private static final long serialVersionUID = 0L;
-
- /** */
- private final StackedProcessor prev;
-
- /**
- * @param prev Previous closure.
- */
- private StackedProcessor(@Nullable StackedProcessor prev) {
- this.prev = prev;
- }
-
- /** {@inheritDoc} */
- @Override public Void process(MutableEntry<GridHadoopJobId,
GridHadoopJobMetadata> e, Object... args) {
- GridHadoopJobMetadata val = apply(e.getValue());
-
- if (val != null)
- e.setValue(val);
- else
- e.remove();;
-
- return null;
- }
-
- /**
- * @param meta Old value.
- * @return New value.
- */
- private GridHadoopJobMetadata apply(GridHadoopJobMetadata meta) {
- if (meta == null)
- return null;
-
- GridHadoopJobMetadata cp = prev != null ? prev.apply(meta) : new
GridHadoopJobMetadata(meta);
-
- update(meta, cp);
-
- return cp;
- }
-
- /**
- * Update given job metadata object.
- *
- * @param meta Initial job metadata.
- * @param cp Copy.
- */
- protected abstract void update(GridHadoopJobMetadata meta,
GridHadoopJobMetadata cp);
- }
-}
