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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17302) the region flush request disappeared from flushQueue
Date Tue, 13 Dec 2016 14:20:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15745274#comment-15745274
] 

Hadoop QA commented on HBASE-17302:
-----------------------------------

| (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 14s {color} | {color:blue}
Docker mode activated. {color} |
| {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:red}-1{color} | {color:red} test4tests {color} | {color:red} 0m 0s {color} | {color:red}
The patch doesn't appear to include any new or modified tests. Please justify why no new tests
are needed for this patch. Also please list what manual steps were performed to verify this
patch. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 2m 55s {color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 36s {color} |
{color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 46s {color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 15s {color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m 47s {color} |
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| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 28s {color} |
{color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 46s {color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 38s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 38s {color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 47s {color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 15s {color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m 0s {color}
| {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green} 26m 37s {color}
| {color:green} Patch does not cause any errors with Hadoop 2.6.1 2.6.2 2.6.3 2.6.4 2.6.5
2.7.1 2.7.2 2.7.3 or 3.0.0-alpha1. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m 59s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 28s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 92m 29s {color} | {color:green}
hbase-server in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 14s {color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 131m 32s {color} | {color:black}
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|| Subsystem || Report/Notes ||
| Docker | Client=1.12.3 Server=1.12.3 Image:yetus/hbase:8d52d23 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12842980/HBASE-17302-branch-master-v1.patch
|
| JIRA Issue | HBASE-17302 |
| Optional Tests |  asflicense  javac  javadoc  unit  findbugs  hadoopcheck  hbaseanti  checkstyle
 compile  |
| uname | Linux 80c11875587d 3.13.0-93-generic #140-Ubuntu SMP Mon Jul 18 21:21:05 UTC 2016
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 / adb319f |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
|  Test Results | https://builds.apache.org/job/PreCommit-HBASE-Build/4889/testReport/ |
| modules | C: hbase-server U: hbase-server |
| Console output | https://builds.apache.org/job/PreCommit-HBASE-Build/4889/console |
| Powered by | Apache Yetus 0.3.0   http://yetus.apache.org |


This message was automatically generated.



> the region flush request disappeared from flushQueue
> ----------------------------------------------------
>
>                 Key: HBASE-17302
>                 URL: https://issues.apache.org/jira/browse/HBASE-17302
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 2.0.0, 0.98.23, 1.2.4
>            Reporter: Guangxu Cheng
>         Attachments: HBASE-17302-branch-1.2-v1.patch, HBASE-17302-branch-master-v1.patch
>
>
> Region has too many store files delaying flush up to blockingWaitTime ms, and the region
flush request is requeued into the flushQueue.
> When the region flush request is requeued into the flushQueue frequently, the request
is inexplicably disappeared sometimes. 
> But regionsInQueue still contains the information of the region request, which leads
to new flush request can not be inserted into the flushQueue.
> Then, the region will not do flush anymore.
> In order to locate the problem, I added a lot of log in the code.
> {code:title=MemStoreFlusher.java|borderStyle=solid}
> private boolean flushRegion(final HRegion region, final boolean emergencyFlush) {
> long startTime = 0;
> synchronized (this.regionsInQueue) {
>   FlushRegionEntry fqe = this.regionsInQueue.remove(region);
>   // Use the start time of the FlushRegionEntry if available
>   if (fqe != null) {
> 	startTime = fqe.createTime;
>   }
>   if (fqe != null && emergencyFlush) {
> 	// Need to remove from region from delay queue.  When NOT an
> 	// emergencyFlush, then item was removed via a flushQueue.poll.
> 	flushQueue.remove(fqe);
>  }
> }
> {code}
> When encountered emergencyFlush, the region flusher will be removed from the flushQueue.
> By comparing the flushQueue content before and after remove, RegionA should have been
removed, it is possible to remove RegionB.
> {code:title=MemStoreFlusher.java|borderStyle=solid}
> public boolean equals(Object obj) {
>   if (this == obj) {
> 	return true;
>   }
>   if (obj == null || getClass() != obj.getClass()) {
> 	return false;
>   }
>   Delayed other = (Delayed) obj;
>   return compareTo(other) == 0;
> }
> {code}
> FlushRegionEntry in achieving the equals function, only comparison of the delay time,
if different regions of the same delay time, it is possible that A wrong B.



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