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https://issues.apache.org/jira/browse/HBASE-16142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15385950#comment-15385950
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Hadoop QA commented on HBASE-16142:
-----------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:green}+1{color} | {color:green} hbaseanti {color} | {color:green} 0m 
0s {color} | {color:green} Patch does not have any anti-patterns. {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} 6m 
39s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 47s 
{color} | {color:green} master passed with JDK v1.8.0 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 46s 
{color} | {color:green} master passed with JDK v1.7.0_80 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 1m 
5s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
21s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 2m 
45s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 51s 
{color} | {color:green} master passed with JDK v1.8.0 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 50s 
{color} | {color:green} master passed with JDK v1.7.0_80 {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 
59s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 11s 
{color} | {color:green} the patch passed with JDK v1.8.0 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 1m 11s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 46s 
{color} | {color:green} the patch passed with JDK v1.7.0_80 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 46s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 1m 
4s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
20s {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} hadoopcheck {color} | {color:green} 
38m 7s {color} | {color:green} Patch does not cause any errors with Hadoop 
2.4.0 2.4.1 2.5.0 2.5.1 2.5.2 2.6.1 2.6.2 2.6.3 2.7.1. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 3m 
23s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 58s 
{color} | {color:green} the patch passed with JDK v1.8.0 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 54s 
{color} | {color:green} the patch passed with JDK v1.7.0_80 {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 133m 25s 
{color} | {color:red} hbase-server in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 
32s {color} | {color:green} Patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 197m 33s {color} 
| {color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | 
hadoop.hbase.regionserver.TestRegionMergeTransactionOnCluster |
|   | hadoop.hbase.master.cleaner.TestSnapshotFromMaster |
|   | hadoop.hbase.mapreduce.TestLoadIncrementalHFilesSplitRecovery |
|   | hadoop.hbase.master.procedure.TestMasterFailoverWithProcedures |
|   | hadoop.hbase.regionserver.TestRegionServerMetrics |
|   | hadoop.hbase.client.TestBlockEvictionFromClient |
| Timed out junit tests | 
org.apache.hadoop.hbase.replication.regionserver.TestRegionReplicaReplicationEndpoint
 |
|   | 
org.apache.hadoop.hbase.replication.regionserver.TestReplicationWALReaderManager
 |
|   | org.apache.hadoop.hbase.replication.TestMultiSlaveReplication |
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|| Subsystem || Report/Notes ||
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12819041/HBASE-16142.master.003.patch
 |
| JIRA Issue | HBASE-16142 |
| Optional Tests |  asflicense  javac  javadoc  unit  findbugs  hadoopcheck  
hbaseanti  checkstyle  compile  |
| uname | Linux asf910.gq1.ygridcore.net 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-HBASE-Build/component/dev-support/hbase-personality.sh
 |
| git revision | master / 70f330d |
| Default Java | 1.7.0_80 |
| Multi-JDK versions |  /home/jenkins/tools/java/jdk1.8.0:1.8.0 
/home/jenkins/jenkins-slave/tools/hudson.model.JDK/JDK_1.7_latest_:1.7.0_80 |
| findbugs | v3.0.0 |
| unit | 
https://builds.apache.org/job/PreCommit-HBASE-Build/2685/artifact/patchprocess/patch-unit-hbase-server.txt
 |
| unit test logs |  
https://builds.apache.org/job/PreCommit-HBASE-Build/2685/artifact/patchprocess/patch-unit-hbase-server.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HBASE-Build/2685/testReport/ |
| modules | C: hbase-server U: hbase-server |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/2685/console |
| Powered by | Apache Yetus 0.2.1   http://yetus.apache.org |


This message was automatically generated.



> Trigger JFR session when under duress -- e.g. backed-up request queue count 
> -- and dump the recording to log dir
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-16142
>                 URL: https://issues.apache.org/jira/browse/HBASE-16142
>             Project: HBase
>          Issue Type: Task
>          Components: Operability
>            Reporter: stack
>            Assignee: Konstantin Ryakhovskiy
>            Priority: Minor
>              Labels: beginner
>         Attachments: HBASE-16142.master.001.patch, 
> HBASE-16142.master.002.patch, HBASE-16142.master.003.patch
>
>
> Chatting today w/ a mighty hbase operator on how to figure what is happening 
> during transitory latency spike or any other transitory 'weirdness' in a 
> server, the idea came up that a java flight recording during a spike would 
> include a pretty good picture of what is going on during the time of duress 
> (more ideal would be a trace of the explicit slow queries showing call stack 
> with timings dumped to a sink for later review; i.e. trigger an htrace when a 
> query is slow...).
> Taking a look, programmatically triggering a JFR recording seems doable, if 
> awkward (MBean invocations). There is even a means of specifying 'triggers' 
> based off any published mbean emission -- e.g. a query queue count threshold 
> -- which looks nice. See 
> https://community.oracle.com/thread/3676275?start=0&tstart=0 and 
> https://docs.oracle.com/javacomponents/jmc-5-4/jfr-runtime-guide/run.htm#JFRUH184
> This feature could start out as a blog post describing how to do it for one 
> server. A plugin on Canary that looks at mbean values and if over a 
> configured threshold, triggers a recording remotely could be next. Finally 
> could integrate a couple of triggers that fire when issue via the trigger 
> mechanism.
> Marking as beginner feature.



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