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https://issues.apache.org/jira/browse/HDFS-14250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16758643#comment-16758643
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Erik Krogen commented on HDFS-14250:
------------------------------------
v000 patch LGTM, only minor nit is that I would probably switch the order of
these two lines, so that we give some time for the reader thread to advance
before asserting that it was blocked:
{code}
assertEquals(0, readStatus.get());
Thread.sleep(100);
{code}
> [Standby Reads] msync should sync with active NameNode to fetch the latest
> stateID
> ----------------------------------------------------------------------------------
>
> Key: HDFS-14250
> URL: https://issues.apache.org/jira/browse/HDFS-14250
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Chao Sun
> Assignee: Chao Sun
> Priority: Major
> Attachments: HDFS-14250.000.patch
>
>
> Currently the {{msync}} call is a dummy operation to observer without really
> syncing. Instead, it should:
> # Get the latest stateID from active NN.
> # Use the stateID to talk to observer NN and make sure it is synced.
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