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https://issues.apache.org/jira/browse/HDFS-2177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13068530#comment-13068530
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Aaron T. Myers commented on HDFS-2177:
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bq. Arpit had written a test which reliably reproduces this on a 10 node
cluster. I'm trying to reproduce this on a single node cluster but haven't been
successful so far.
I'm surprised cluster size would be a factor, given that this is an NN/2NN-only
issue.
Ideally you would create a test case using the unit test framework in the
project. This might make it easier to formulate said test case since you could
precisely control the timing/interleaving of NN and 2NN interactions using
mockito, etc. I suspect creating a test to reliably exercise this case on a
running cluster will be very difficult.
> Restarting the namenode when the secondary namenode is checkpointing seems to
> remove everything from /
> ------------------------------------------------------------------------------------------------------
>
> Key: HDFS-2177
> URL: https://issues.apache.org/jira/browse/HDFS-2177
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 0.23.0
> Reporter: Ravi Prakash
> Assignee: Ravi Prakash
> Priority: Blocker
> Fix For: 0.23.0
>
>
> This was again discovered by Arpit Gupta! Restarting the namenode when the
> secondary namenode is checkpointing seems to remove everything from /
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