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https://issues.apache.org/jira/browse/HDFS-2753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13183626#comment-13183626
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Todd Lipcon commented on HDFS-2753:
-----------------------------------
The test adds blocks while the SBN is down. This makes them get queued up in
the block received list of that BPServiceActor.
When it restarts, the DN calls register(), followed by
reportReceivedDeletedBlocks(), followed by blockReport(). So the received
blocks always show up first.
If you comment out the fix, the test case reliably fails with the error you
described (stuck in safemode).
> Standby namenode stuck in safemode during a failover
> ----------------------------------------------------
>
> Key: HDFS-2753
> URL: https://issues.apache.org/jira/browse/HDFS-2753
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha, name-node
> Affects Versions: HA branch (HDFS-1623)
> Reporter: Hari Mankude
> Assignee: Hari Mankude
> Attachments: HDFS-2753.patch, hdfs-2753.txt
>
>
> Write traffic initiated from the client. Manual failover is done by killing
> NN and converting a different standby to active. NN is restarted as standby.
> The restarted standby stays in safemode forever. More information in the
> description.
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