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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6527) Edit log corruption due to defered INode removal
Date Mon, 16 Jun 2014 18:36:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14032747#comment-14032747
] 

Hadoop QA commented on HDFS-6527:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12650582/HDFS-6527.v4.patch
  against trunk revision .

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

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

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

    {color:green}+1 javadoc{color}.  There were no new javadoc 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-hdfs-project/hadoop-hdfs.

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

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/7133//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/7133//console

This message is automatically generated.

> Edit log corruption due to defered INode removal
> ------------------------------------------------
>
>                 Key: HDFS-6527
>                 URL: https://issues.apache.org/jira/browse/HDFS-6527
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.4.0
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Blocker
>         Attachments: HDFS-6527.branch-2.4.patch, HDFS-6527.trunk.patch, HDFS-6527.v2.patch,
HDFS-6527.v3.patch, HDFS-6527.v4.patch
>
>
> We have seen a SBN crashing with the following error:
> {panel}
> \[Edit log tailer\] ERROR namenode.FSEditLogLoader:
> Encountered exception on operation AddBlockOp
> [path=/xxx,
> penultimateBlock=NULL, lastBlock=blk_111_111, RpcClientId=,
> RpcCallId=-2]
> java.io.FileNotFoundException: File does not exist: /xxx
> {panel}
> This was caused by the deferred removal of deleted inodes from the inode map. Since getAdditionalBlock()
acquires FSN read lock and then write lock, a deletion can happen in between. Because of deferred
inode removal outside FSN write lock, getAdditionalBlock() can get the deleted inode from
the inode map with FSN write lock held. This allow addition of a block to a deleted file.
> As a result, the edit log will contain OP_ADD, OP_DELETE, followed by
>  OP_ADD_BLOCK.  This cannot be replayed by NN, so NN doesn't start up or SBN crashes.



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