liuchang0520 commented on a change in pull request #6778:
URL: https://github.com/apache/incubator-pinot/pull/6778#discussion_r655905507
##########
File path:
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/realtime/PinotLLCRealtimeSegmentManager.java
##########
@@ -1214,4 +1287,147 @@ private int
getMaxNumPartitionsPerInstance(InstancePartitions instancePartitions
return (numPartitions + numInstancesPerReplicaGroup - 1) /
numInstancesPerReplicaGroup;
}
}
+
+ // Pre-fetch the LLC segments without deep store copy.
+ public void prefetchLLCSegmentsWithoutDeepStoreCopy(String
tableNameWithType) {
+ TableType tableType =
TableNameBuilder.getTableTypeFromTableName(tableNameWithType);
+ if (tableType != TableType.REALTIME) {
+ return;
+ }
+
+ TableConfig tableConfig =
_helixResourceManager.getTableConfig(tableNameWithType);
+ if (tableConfig == null) {
+ LOGGER.warn("Failed to find table config for table: {}",
tableNameWithType);
+ return;
+ }
+
+ PartitionLevelStreamConfig streamConfig = new
PartitionLevelStreamConfig(tableConfig.getTableName(),
+ IngestionConfigUtils.getStreamConfigMap(tableConfig));
+ if (!streamConfig.hasLowLevelConsumerType()) {
+ return;
+ }
+
+ long currentTimeMs = getCurrentTimeMs();
+ List<String> segmentNames =
ZKMetadataProvider.getLLCRealtimeSegments(_propertyStore, tableNameWithType);
+ for (String segmentName : segmentNames) {
+ try {
+ if (!isLLCSegmentWithinValidationRange(segmentName, currentTimeMs)) {
+ continue;
+ }
+
+ LLCRealtimeSegmentZKMetadata segmentZKMetadata =
getSegmentZKMetadata(tableNameWithType, segmentName, new Stat());
+ // Cache the committed LLC segments without segment store download
url
+ if (segmentZKMetadata.getStatus() == Status.DONE &&
+
CommonConstants.Segment.METADATA_URI_FOR_PEER_DOWNLOAD.equals(segmentZKMetadata.getDownloadUrl()))
{
+ cacheLLCSegmentNameForUpload(tableNameWithType, segmentName);
+ }
+ } catch (Exception e) {
+ _controllerMetrics.addValueToTableGauge(tableNameWithType,
+
ControllerGauge.NUMBER_OF_ERRORS_FOR_LLC_SEGMENTS_ZK_METADATA_PREFETCH, 1L);
+ LOGGER.error("Failed to fetch the LLC segment {} ZK metadata",
segmentName);
+ }
+ }
+ }
+
+ /**
+ * Only validate recently created LLC segment for missing deep store
download url.
+ * The time range check is based on segment name. This step helps to
alleviate ZK access.
+ */
+ private boolean isLLCSegmentWithinValidationRange(String segmentName, long
currentTimeMs) {
+ LLCSegmentName llcSegmentName = new LLCSegmentName(segmentName);
+ long creationTimeMs = llcSegmentName.getCreationTimeMs();
+ return currentTimeMs - creationTimeMs <
_validationRangeForLLCSegmentsDeepStoreCopyMs;
+ }
+
+ /**
+ * Fix the missing LLC segment in deep store by asking servers to upload,
and add segment store download uri in ZK.
+ * Since uploading to segment store involves expensive compression step
(first tar up the segment and then upload), we don't want to retry the
uploading.
+ * Segment without segment store copy can still be downloaded from peer
servers.
+ * @see <a
href="https://cwiki.apache.org/confluence/display/PINOT/By-passing+deep-store+requirement+for+Realtime+segment+completion#BypassingdeepstorerequirementforRealtimesegmentcompletion-Failurecasesandhandling";>By-passing
deep-store requirement for Realtime segment completion:Failure cases and
handling</a>
+ */
+ public void uploadToSegmentStoreIfMissing(TableConfig tableConfig) {
+ String realtimeTableName = tableConfig.getTableName();
+ if (_isStopping) {
+ LOGGER.info("Skipped fixing segment store copy of LLC segments for table
{}, because segment manager is stopping.", realtimeTableName);
Review comment:
Make sense.
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