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https://issues.apache.org/jira/browse/HDFS-13880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16606386#comment-16606386
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Erik Krogen commented on HDFS-13880:
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Hey [~vagarychen], v002 looks really great!
* In the Javadoc for {{AlignmentContext#isCoordinatedCall()}}, there should be
an empty line between the body of text and the first {{@param}} tag.
* In {{ipc.Server}} L2537, we assume the request is Protobuf. I think it's
probably fine not to perform correctly if a {{Writable}} comes along, but we
should at least check that it is in fact using Protobuf (to avoid a
{{ClassCastException}}).
* It seems the test could be improved from its current state of being brittle
(time-dependent) and slow. I am thinking something like:
** Set the edit tail frequency very high to be sure it won't happen unless we
trigger it manually
** In thread A, submit the blocking call (msync needed)
** In thread B, wait a little, then manually trigger the edit tail
** Confirm that thread A was able to complete its call
* Why isn't {{getContentSummary}} coordinated?
> Add mechanism to allow certain RPC calls to bypass sync
> -------------------------------------------------------
>
> Key: HDFS-13880
> URL: https://issues.apache.org/jira/browse/HDFS-13880
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Chen Liang
> Assignee: Chen Liang
> Priority: Major
> Attachments: HDFS-13880-HDFS-12943.001.patch,
> HDFS-13880-HDFS-12943.002.patch, HDFS-13880-HDFS-12943.003.patch
>
>
> Currently, every single call to NameNode will be synced, in the sense that
> NameNode will not process it until state id catches up. But in certain cases,
> we would like to bypass this check and allow the call to return immediately,
> even when the server id is not up to date. One case could be the to-be-added
> new API in HDFS-13749 that request for current state id. Others may include
> calls that do not promise real time responses such as {{getContentSummary}}.
> This Jira is to add the mechanism to allow certain calls to bypass sync.
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