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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9932) Name node crashes due to improper synchronization in RetryCache
Date Wed, 04 Sep 2013 18:02:54 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13758073#comment-13758073
] 

Hadoop QA commented on HADOOP-9932:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12601409/HADOOP-9932.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  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:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-common-project/hadoop-common.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/3059//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/3059//console

This message is automatically generated.
                
> Name node crashes due to improper synchronization in RetryCache
> ---------------------------------------------------------------
>
>                 Key: HADOOP-9932
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9932
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Kihwal Lee
>            Priority: Blocker
>         Attachments: HADOOP-9932.patch
>
>
> In LightWeightCache#evictExpiredEntries(), the precondition check can fail. [~patwhitey2007]
ran a HA failover test and it occurred while the SBN was catching up with edits during a transition
to active. This caused NN to terminate.
> Here is my theory: If an RPC handler calls waitForCompletion() and it happens to remove
the head of the queue in get(), it will race with evictExpiredEntries() frrom put().

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