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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5590) Block ID and generation stamp may be reused when persistBlocks is set to false
Date Tue, 03 Dec 2013 00:38:36 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13837154#comment-13837154
] 

Hadoop QA commented on HDFS-5590:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12616620/HDFS-5590.000.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:red}-1 eclipse:eclipse{color}.  The patch failed to build with eclipse:eclipse.

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

        {color:red}-1 release audit{color}.  The applied patch generated 1 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/5614//testReport/
Release audit warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/5614//artifact/trunk/patchprocess/patchReleaseAuditProblems.txt
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/5614//console

This message is automatically generated.

> Block ID and generation stamp may be reused when persistBlocks is set to false
> ------------------------------------------------------------------------------
>
>                 Key: HDFS-5590
>                 URL: https://issues.apache.org/jira/browse/HDFS-5590
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.2.0
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-5590.000.patch, HDFS-5590.001.patch
>
>
> In a cluster with non-HA setup and dfs.persist.blocks set to false, we may have data
loss in the following case:
> # client creates file1 and requests a block from NN and get blk_id1_gs1
> # client writes blk_id1_gs1 to DN
> # NN is restarted and because persistBlocks is false, blk_id1_gs1 may not be persisted
in disk
> # another client creates file2 and NN will allocate a new block using the same block
id blk_id1_gs1 since block ID and generation stamp are both increased sequentially.
> Now we may have two versions (file1 and file2) of the blk_id1_gs1 (same id, same gs)
in the system. It will case data loss.



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