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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9313) Possible NullPointerException in BlockManager if no excess replica can be chosen
Date Tue, 27 Oct 2015 16:36:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14976685#comment-14976685
] 

Hadoop QA commented on HDFS-9313:
---------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | pre-patch |  21m  6s | Pre-patch trunk has 1 extant Findbugs (version
3.0.0) warnings. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any @author tags.
|
| {color:green}+1{color} | tests included |   0m  0s | The patch appears to include 1 new
or modified test files. |
| {color:green}+1{color} | javac |   9m 11s | There were no new javac warning messages. |
| {color:green}+1{color} | javadoc |  12m  3s | There were no new javadoc warning messages.
|
| {color:green}+1{color} | release audit |   0m 27s | The applied patch does not increase
the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle |   1m 40s | There were no new checkstyle issues. |
| {color:green}+1{color} | whitespace |   0m  0s | The patch has no lines that end in whitespace.
|
| {color:green}+1{color} | install |   1m 48s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 40s | The patch built with eclipse:eclipse.
|
| {color:green}+1{color} | findbugs |   2m 55s | The patch does not introduce any new Findbugs
(version 3.0.0) warnings. |
| {color:green}+1{color} | native |   3m 42s | Pre-build of native portion |
| {color:red}-1{color} | hdfs tests |  55m  9s | Tests failed in hadoop-hdfs. |
| | | 108m 46s | |
\\
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|| Reason || Tests ||
| Failed unit tests | hadoop.hdfs.shortcircuit.TestShortCircuitCache |
|   | hadoop.hdfs.server.namenode.ha.TestBootstrapStandbyWithQJM |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12768993/HDFS-9313-2.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / bcb2386 |
| Pre-patch Findbugs warnings | https://builds.apache.org/job/PreCommit-HDFS-Build/13225/artifact/patchprocess/trunkFindbugsWarningshadoop-hdfs.html
|
| hadoop-hdfs test log | https://builds.apache.org/job/PreCommit-HDFS-Build/13225/artifact/patchprocess/testrun_hadoop-hdfs.txt
|
| Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/13225/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf900.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 |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/13225/console |


This message was automatically generated.

> Possible NullPointerException in BlockManager if no excess replica can be chosen
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-9313
>                 URL: https://issues.apache.org/jira/browse/HDFS-9313
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Ming Ma
>            Assignee: Ming Ma
>         Attachments: HDFS-9313-2.patch, HDFS-9313.patch
>
>
> HDFS-8647 makes it easier to reason about various block placement scenarios. Here is
one possible case where BlockManager won't be able to find the excess replica to delete: when
storage policy changes around the same time balancer moves the block. When this happens, it
will cause NullPointerException.
> {noformat}
> java.lang.NullPointerException
> 	at org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy.adjustSetsWithChosenReplica(BlockPlacementPolicy.java:156)
> 	at org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseReplicasToDelete(BlockPlacementPolicyDefault.java:978)
> {noformat}
> Note that it isn't found in any production clusters. Instead, it is found from new unit
tests. In addition, the issue has been there before HDFS-8647.



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