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https://issues.apache.org/jira/browse/HDFS-4859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13669982#comment-13669982
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Kihwal Lee commented on HDFS-4859:
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Thank you for the clarification. Fortunately I have a little bit of experience
in Linux kernel, storage and fault-tolerance, so I was able to digest what you
have described so far. Although you do not recommend the NFS + manual failover,
I now understand you are not against a FJM improvement that could benefit
existing installations as part of continuing support. I don't believe addition
of this feature will be interpreted as a promotion or encouragement, since
QJM+ZKFC is clearly newer, more capable and users like your customers are happy
with it.
> Add timeout in FileJournalManager
> ---------------------------------
>
> Key: HDFS-4859
> URL: https://issues.apache.org/jira/browse/HDFS-4859
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ha, namenode
> Affects Versions: 2.0.4-alpha
> Reporter: Kihwal Lee
>
> Due to absence of explicit timeout in FileJournalManager, error conditions
> that incur long delay (usually until driver timeout) can make namenode
> unresponsive for long time. This directly affects NN's failure detection
> latency, which is critical in HA.
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