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https://issues.apache.org/jira/browse/HDFS-14272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16767418#comment-16767418
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Erik Krogen commented on HDFS-14272:
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I don't see us handling this logic anywhere. I think we need to enhance the
checks in {{ObserverReadProxyProvider.ObserverReadInvocationHandler#invoke()}}
so that the very first command always goes to active, thus fetching the active
stateID. cc [~vagarychen] [~csun] [~shv]
> [SBN read] HDFS command line tools does not guarantee consistency
> -----------------------------------------------------------------
>
> Key: HDFS-14272
> URL: https://issues.apache.org/jira/browse/HDFS-14272
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: tools
> Environment: CDH6.1 (Hadoop 3.0.x) + Consistency Reads from Standby +
> SSL + Kerberos + RPC encryption
> Reporter: Wei-Chiu Chuang
> Assignee: Erik Krogen
> Priority: Major
>
> It is typical for integration tests to create some files and then check their
> existence. For example, like the following simple bash script:
> {code:java}
> # hdfs dfs -touchz /tmp/abc
> # hdfs dfs -ls /tmp/abc
> {code}
> The test executes HDFS bash command sequentially, but it may fail with
> Consistent Standby Read because the -ls does not find the file.
> Analysis: the second bash command, while launched sequentially after the
> first one, is not aware of the state id returned from the first bash command.
> So ObserverNode wouldn't wait for the the edits to get propagated, and thus
> fails.
> I've got a cluster where the Observer has tens of seconds of RPC latency, and
> this becomes very annoying. (I am still trying to figure out why this
> Observer has such a long RPC latency. But that's another story.)
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