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Date: Wed, 28 Aug 2013 01:10:53 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12662211.1375819562149.44373.1377652253434@arcas>
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Subject: [jira] [Commented] (HDFS-5074) Allow starting up from an fsimage
 checkpoint in the middle of a segment
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    [ https://issues.apache.org/jira/browse/HDFS-5074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13751985#comment-13751985 ] 

Hadoop QA commented on HDFS-5074:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12600284/hdfs-5074.txt
  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 10 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}.  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-hdfs-project/hadoop-hdfs hadoop-hdfs-project/hadoop-hdfs/src/contrib/bkjournal.

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

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/4899//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/4899//console

This message is automatically generated.
                
> Allow starting up from an fsimage checkpoint in the middle of a segment
> -----------------------------------------------------------------------
>
>                 Key: HDFS-5074
>                 URL: https://issues.apache.org/jira/browse/HDFS-5074
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha, namenode
>    Affects Versions: 3.0.0, 2.1.0-beta
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-5074.txt
>
>
> We've seen the following behavior a couple times:
> - SBN is running and somehow encounters an error in the middle of replaying an edit log in the tailer (eg the JN it's reading from crashes)
> - SBN successfully has processed half of the edits in the segment it was reading.
> - SBN saves a checkpoint, which now falls in the middle of a segment, and then restarts
> Upon restart, the SBN will load this checkpoint which falls in the middle of a segment. {{selectInputStreams}} then fails when the SBN requests a mid-segment txid.
> We should handle this case by downloading the right segment and fast-forwarding to the correct txid.

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