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From "Andy Isaacson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8553) SNN can fail to start on upgrade
Date Wed, 04 Jul 2012 00:15:34 GMT
Andy Isaacson created HADOOP-8553:
-------------------------------------

             Summary: SNN can fail to start on upgrade
                 Key: HADOOP-8553
                 URL: https://issues.apache.org/jira/browse/HADOOP-8553
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 2.0.0-alpha
            Reporter: Andy Isaacson
            Assignee: Andy Isaacson
            Priority: Minor


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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