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https://issues.apache.org/jira/browse/HDFS-4347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13540651#comment-13540651
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Konstantin Shvachko commented on HDFS-4347:
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In the case {{waitCheckpointDone()}} will loop until the next checkpoint spewing
{code}
2012-12-28 15:37:13,664 INFO namenode.TestBackupNode
(TestBackupNode.java:waitCheckpointDone(117)) - Waiting checkpoint to
complete... checkpoint txid should increase above 10
2012-12-28 15:37:21,986 INFO namenode.TestBackupNode
(TestBackupNode.java:waitCheckpointDone(117)) - Waiting checkpoint to
complete... checkpoint txid should increase above 10
2012-12-28 15:37:22,987 INFO namenode.TestBackupNode
(TestBackupNode.java:waitCheckpointDone(117)) - Waiting checkpoint to
complete... checkpoint txid should increase above 10
{code}
Which will go on until the next checkpoint, which could be long depending on
configuration parameters.
The problem is that in {{testCheckpoint(StartupOption op)}} we
{{startBackupNode()}} twice and both times {{waitCheckpointDone()}} after that.
The difference is that in the first occurrence {{txid}} is calculated before
{{startBackupNode()}} and in the second it is calculated afterwards.
> TestBackupNode can go into infinite loop "Waiting checkpoint to complete."
> --------------------------------------------------------------------------
>
> Key: HDFS-4347
> URL: https://issues.apache.org/jira/browse/HDFS-4347
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode, test
> Affects Versions: 2.0.3-alpha
> Reporter: Konstantin Shvachko
>
> {{waitCheckpointDone()}} can loop forever if txid to wait for is calculated
> after {{startBackupNode()}}.
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