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https://issues.apache.org/jira/browse/HBASE-19511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16290499#comment-16290499
]
Hadoop QA commented on HBASE-19511:
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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
9s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} ||
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 0m
0s{color} | {color:blue} Findbugs executables are not available. {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:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m
0s{color} | {color:green} The patch appears to include 4 new or modified test
files. {color} |
|| || || || {color:brown} master Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 4m
7s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
39s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
56s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} shadedjars {color} | {color:green} 4m
59s{color} | {color:green} branch has no errors when building our shaded
downstream artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
26s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 4m
13s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
37s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m
37s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 0m
55s{color} | {color:red} hbase-server: The patch generated 2 new + 73 unchanged
- 0 fixed = 75 total (was 73) {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} shadedjars {color} | {color:green} 4m
2s{color} | {color:green} patch has no errors when building our shaded
downstream artifacts. {color} |
| {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green}
17m 18s{color} | {color:green} Patch does not cause any errors with Hadoop
2.6.5 2.7.4 or 3.0.0-beta1. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
26s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 91m
37s{color} | {color:green} hbase-server in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
19s{color} | {color:green} The patch does not generate ASF License warnings.
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}126m 0s{color} |
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hbase:eee3b01 |
| JIRA Issue | HBASE-19511 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12902006/HBASE-19511.patch |
| Optional Tests | asflicense javac javadoc unit findbugs shadedjars
hadoopcheck hbaseanti checkstyle compile |
| uname | Linux 680e67b4c35b 4.4.0-43-generic #63-Ubuntu SMP Wed Oct 12
13:48:03 UTC 2016 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 / ba5f9ac380 |
| maven | version: Apache Maven 3.5.2
(138edd61fd100ec658bfa2d307c43b76940a5d7d; 2017-10-18T07:58:13Z) |
| Default Java | 1.8.0_151 |
| checkstyle |
https://builds.apache.org/job/PreCommit-HBASE-Build/10436/artifact/patchprocess/diff-checkstyle-hbase-server.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-HBASE-Build/10436/testReport/ |
| modules | C: hbase-server U: hbase-server |
| Console output |
https://builds.apache.org/job/PreCommit-HBASE-Build/10436/console |
| Powered by | Apache Yetus 0.6.0 http://yetus.apache.org |
This message was automatically generated.
> Splits causes blocks to be cached again and so such blocks cannot be evicted
> from bucket cache
> ----------------------------------------------------------------------------------------------
>
> Key: HBASE-19511
> URL: https://issues.apache.org/jira/browse/HBASE-19511
> Project: HBase
> Issue Type: Bug
> Components: BucketCache
> Affects Versions: 2.0.0-alpha-4
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Priority: Critical
> Fix For: 3.0.0, 2.0.0-beta-1
>
> Attachments: HBASE-19511.patch
>
>
> This is because of similar pattern as in
> https://issues.apache.org/jira/browse/HBASE-8547.
> It took a lot of time to debug this and the reason for
> TestBlockeEvictionFromClient was flaky due to this.
> When we create split files the index of the firstKey that we create could
> possibly be the same key as in the case of #testBlockRefCountAfterSplits().
> In such cases we were getting the same block to be cached again in the bucket
> cache. As part of HBASE-8547 such cases were being handled.
> {code}
> String msg = "Caching an already cached block: " + cacheKey;
> msg += ". This is harmless and can happen in rare cases (see
> HBASE-8547)";
> LOG.warn(msg);
> {code}
> But this is a tricky case where this log msg will be coming only when block
> with same cachekey was completely cached in the bucket cache. If there is a
> case where the block with the same cachekey was not yet completed written to
> bucket cache (by cache writer threads) this this log msg won't come but the
> ramCache key wil prevent the block from again getting cached.
> {code}
> if (ramCache.putIfAbsent(cacheKey, re) != null) {
> return;
> }
> {code}
> So when ever the block was getting cached once again and it is already in
> backingMap then we were doing a getBlock() to verify if the block is the same
> block. This was internallly adding to the refcount and so those blocks will
> never get removed from the bucket cache queue. ( there is no one to decrement
> the ref count on such cases).
> So I think for this rare cases it is better we do a copy of the block and
> then check if the block is same as the existing one. This should be harmless
> and should help us in doing proper ref counting
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