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https://issues.apache.org/jira/browse/HADOOP-12482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14983102#comment-14983102
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Hadoop QA commented on HADOOP-12482:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 7s
{color} | {color:blue} docker + precommit patch detected. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m 0s
{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m
0s {color} | {color:green} The patch appears to include 1 new or modified test
files. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 3m
35s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 4m 24s
{color} | {color:green} trunk passed with JDK v1.8.0_60 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 4m 8s
{color} | {color:green} trunk passed with JDK v1.7.0_79 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
14s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m
13s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m
37s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 55s
{color} | {color:green} trunk passed with JDK v1.8.0_60 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 2s
{color} | {color:green} trunk passed with JDK v1.7.0_79 {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m
23s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 4m 18s
{color} | {color:green} the patch passed with JDK v1.8.0_60 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 4m 18s
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 4m 7s
{color} | {color:green} the patch passed with JDK v1.7.0_79 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 4m 7s
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
14s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m
14s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m
0s {color} | {color:green} Patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m
45s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 52s
{color} | {color:green} the patch passed with JDK v1.8.0_60 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 0s
{color} | {color:green} the patch passed with JDK v1.7.0_79 {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 6m 37s
{color} | {color:green} hadoop-common in the patch passed with JDK v1.8.0_60.
{color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 6m 31s {color}
| {color:red} hadoop-common in the patch failed with JDK v1.7.0_79. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
24s {color} | {color:green} Patch does not generate ASF License warnings.
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 44m 39s {color}
| {color:black} {color} |
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|| Reason || Tests ||
| JDK v1.7.0_79 Failed junit tests | hadoop.security.TestShellBasedIdMapping |
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|| Subsystem || Report/Notes ||
| Docker | Client=1.7.1 Server=1.7.1
Image:test-patch-base-hadoop-date2015-10-30 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12769820/HADOOP-12482.003.patch
|
| JIRA Issue | HADOOP-12482 |
| Optional Tests | asflicense javac javadoc mvninstall unit findbugs
checkstyle compile |
| uname | Linux 8d99547a218b 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed
Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality |
/home/jenkins/jenkins-slave/workspace/PreCommit-HADOOP-Build/patchprocess/apache-yetus-e77b1ce/precommit/personality/hadoop.sh
|
| git revision | trunk / 45d3967 |
| Default Java | 1.7.0_79 |
| Multi-JDK versions | /usr/lib/jvm/java-8-oracle:1.8.0_60
/usr/lib/jvm/java-7-openjdk-amd64:1.7.0_79 |
| findbugs | v3.0.0 |
| unit |
https://builds.apache.org/job/PreCommit-HADOOP-Build/7980/artifact/patchprocess/patch-unit-hadoop-common-project_hadoop-common-jdk1.7.0_79.txt
|
| unit test logs |
https://builds.apache.org/job/PreCommit-HADOOP-Build/7980/artifact/patchprocess/patch-unit-hadoop-common-project_hadoop-common-jdk1.7.0_79.txt
|
| JDK v1.7.0_79 Test Results |
https://builds.apache.org/job/PreCommit-HADOOP-Build/7980/testReport/ |
| modules | C: hadoop-common-project/hadoop-common U:
hadoop-common-project/hadoop-common |
| Max memory used | 227MB |
| Powered by | Apache Yetus http://yetus.apache.org |
| Console output |
https://builds.apache.org/job/PreCommit-HADOOP-Build/7980/console |
This message was automatically generated.
> Race condition in JMX cache update
> ----------------------------------
>
> Key: HADOOP-12482
> URL: https://issues.apache.org/jira/browse/HADOOP-12482
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.7.1
> Reporter: Tony Wu
> Assignee: Tony Wu
> Attachments: HADOOP-12482.001.patch, HADOOP-12482.002.patch,
> HADOOP-12482.003.patch
>
>
> updateJmxCache() was updated in HADOOP-11301. However the patch introduced a
> race condition. In updateJmxCache() function in MetricsSourceAdapter.java:
> {code:java}
> private void updateJmxCache() {
> boolean getAllMetrics = false;
> synchronized (this) {
> if (Time.now() - jmxCacheTS >= jmxCacheTTL) {
> // temporarilly advance the expiry while updating the cache
> jmxCacheTS = Time.now() + jmxCacheTTL;
> if (lastRecs == null) {
> getAllMetrics = true;
> }
> } else {
> return;
> }
> if (getAllMetrics) {
> MetricsCollectorImpl builder = new MetricsCollectorImpl();
> getMetrics(builder, true);
> }
> updateAttrCache();
> if (getAllMetrics) {
> updateInfoCache();
> }
> jmxCacheTS = Time.now();
> lastRecs = null; // in case regular interval update is not running
> }
> }
> {code}
> Notice that getAllMetrics is set to true when:
> # jmxCacheTTL has passed
> # lastRecs == null
> lastRecs is set to null in the same function, but gets reassigned by
> getMetrics().
> However getMetrics() can be called from a different thread:
> # MetricsSystemImpl.onTimerEvent()
> # MetricsSystemImpl.publishMetricsNow()
> Consider the following sequence:
> # updateJmxCache() is called by getMBeanInfo() from a thread getting cached
> info.
> ** lastRecs is set to null.
> # metrics sources is updated with new value/field.
> # getMetrics() is called by publishMetricsNow() or onTimerEvent() from a
> different thread getting the latest metrics.
> ** lastRecs is updated (!= null).
> # jmxCacheTTL passed.
> # updateJmxCache() is called again via getMBeanInfo().
> ** However because lastRecs is already updated (!= null), getAllMetrics will
> not be set to true. So updateInfoCache() is not called and getMBeanInfo()
> returns the old cached info.
> We ran into this issue on a cluster where a new metric did not get published
> until much later.
> The case can be made worse by a periodic call to getMetrics() (driven by an
> external program or script). In such case getMBeanInfo() may never be able to
> retrieve the new record.
> The desired behavior should be that updateJmxCache() will guarantee to call
> updateInfoCache() once after jmxCacheTTL, if lastRecs has been set to null by
> updateJmxCache() itself.
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