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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4300) TransferFsImage.downloadEditsToStorage should use a tmp file for destination
Date Tue, 14 May 2013 14:07:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13657070#comment-13657070
] 

Hudson commented on HDFS-4300:
------------------------------

Integrated in Hadoop-Mapreduce-trunk #1425 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1425/])
    HDFS-4300. TransferFsImage.downloadEditsToStorage should use a tmp file for destination.
Contributed by Andrew Wang. (Revision 1481987)

     Result = SUCCESS
atm : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1481987
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/CheckpointFaultInjector.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NNStorage.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/SecondaryNameNode.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/TransferFsImage.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestCheckpoint.java

                
> TransferFsImage.downloadEditsToStorage should use a tmp file for destination
> ----------------------------------------------------------------------------
>
>                 Key: HDFS-4300
>                 URL: https://issues.apache.org/jira/browse/HDFS-4300
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.0.2-alpha
>            Reporter: Todd Lipcon
>            Assignee: Andrew Wang
>            Priority: Critical
>             Fix For: 2.0.5-beta
>
>         Attachments: hdfs-4300-1.patch, hdfs-4300-2.patch, hdfs-4300-3.patch, hdfs-4300-4.patch,
hdfs-4300-5.patch
>
>
> Currently, in TransferFsImage.downloadEditsToStorage, we download the edits file directly
to its finalized path. So, if the transfer fails in the middle, a half-written file is left
and cannot be distinguished from a correct file. So, future checkpoints by the 2NN will fail,
since the file is truncated in the middle -- but it won't ever download a good copy because
it thinks it already has the proper file.

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