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https://issues.apache.org/jira/browse/HDFS-4128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13592320#comment-13592320
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Daryn Sharp commented on HDFS-4128:
-----------------------------------
+1 Looks good, will commit shortly.
> 2NN gets stuck in inconsistent state if edit log replay fails in the middle
> ---------------------------------------------------------------------------
>
> Key: HDFS-4128
> URL: https://issues.apache.org/jira/browse/HDFS-4128
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.0.2-alpha
> Reporter: Todd Lipcon
> Assignee: Kihwal Lee
> Attachments: hdfs-4128.b023.patch, hdfs-4128.patch, hdfs-4128.patch
>
>
> We saw the following issue in a cluster:
> - The 2NN downloads an edit log segment:
> {code}
> 2012-10-29 12:30:57,433 INFO org.apache.hadoop.hdfs.server.namenode.FSImage:
> Reading /xxxxxxx/current/edits_0000000000049136809-0000000000049176162
> expecting start txid #49136809
> {code}
> - It fails in the middle of replay due to an OOME:
> {code}
> 2012-10-29 12:31:21,021 ERROR
> org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader: Encountered exception
> on operation AddOp [length=0, path=/xxxxxxxx
> java.lang.OutOfMemoryError: Java heap space
> {code}
> - Future checkpoints then fail because the prior edit log replay only got
> halfway through the stream:
> {code}
> 2012-10-29 12:32:21,214 INFO org.apache.hadoop.hdfs.server.namenode.FSImage:
> Reading /xxxxx/current/edits_0000000000049176163-0000000000049177224
> expecting start txid #49144432
> 2012-10-29 12:32:21,216 ERROR
> org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode: Exception in
> doCheckpoint
> java.io.IOException: There appears to be a gap in the edit log. We expected
> txid 49144432, but got txid 49176163.
> {code}
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