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Date: Sat, 21 Jul 2012 12:48:38 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <646955260.85929.1342874918702.JavaMail.jiratomcat@issues-vm>
Subject: [jira] [Commented] (HDFS-3597) SNN can fail to start on upgrade
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    [ https://issues.apache.org/jira/browse/HDFS-3597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419825#comment-13419825 ] 

Hudson commented on HDFS-3597:
------------------------------

Integrated in Hadoop-Hdfs-trunk #1111 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1111/])
    HDFS-3597. SNN fails to start after DFS upgrade. Contributed by Andy Isaacson. (Revision 1363899)

     Result = FAILURE
todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1363899
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/CheckpointSignature.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/test/java/org/apache/hadoop/hdfs/server/namenode/TestSecondaryNameNodeUpgrade.java

                
> SNN can fail to start on upgrade
> --------------------------------
>
>                 Key: HDFS-3597
>                 URL: https://issues.apache.org/jira/browse/HDFS-3597
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.0.0-alpha
>            Reporter: Andy Isaacson
>            Assignee: Andy Isaacson
>            Priority: Minor
>             Fix For: 3.0.0, 2.2.0-alpha
>
>         Attachments: hdfs-3597-2.txt, hdfs-3597-3.txt, hdfs-3597-4.txt, hdfs-3597.txt
>
>
> When upgrading from 1.x to 2.0.0, the SecondaryNameNode can fail to start up:
> {code}
> 2012-06-16 09:52:33,812 ERROR org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode: Exception in doCheckpoint
> java.io.IOException: Inconsistent checkpoint fields.
> LV = -40 namespaceID = 64415959 cTime = 1339813974990 ; clusterId = CID-07a82b97-8d04-4fdd-b3a1-f40650163245 ; blockpoolId = BP-1792677198-172.29.121.67-1339813967723.
> Expecting respectively: -19; 64415959; 0; ; .
> at org.apache.hadoop.hdfs.server.namenode.CheckpointSignature.validateStorageInfo(CheckpointSignature.java:120)
> at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.doCheckpoint(SecondaryNameNode.java:454)
> at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.doWork(SecondaryNameNode.java:334)
> at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode$2.run(SecondaryNameNode.java:301)
> at org.apache.hadoop.security.SecurityUtil.doAsLoginUserOrFatal(SecurityUtil.java:438)
> at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.run(SecondaryNameNode.java:297)
> at java.lang.Thread.run(Thread.java:662)
> {code}
> The error check we're hitting came from HDFS-1073, and it's intended to verify that we're connecting to the correct NN.  But the check is too strict and considers "different metadata version" to be the same as "different clusterID".
> I believe the check in {{doCheckpoint}} simply needs to explicitly check for and handle the update case.

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