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https://issues.apache.org/jira/browse/HDFS-13872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16598047#comment-16598047
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Erik Krogen commented on HDFS-13872:
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I like the idea of marking only certain methods. I've attached a v000 patch
which only adds the {{AlignmentContext}} if the provided method is annotated
with a new annotation, {{AlignmentContext.NeedsAlignment}}. This can't be a
part of {{ReadOnly}} since that is HDFS-specific and {{AlignmentContext}} is
generic.
v000 patch doesn't contain tests or actually annotate any methods with this
yet, just posting for comments.
> Only some protocol methods should perform msync wait
> ----------------------------------------------------
>
> Key: HDFS-13872
> URL: https://issues.apache.org/jira/browse/HDFS-13872
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Erik Krogen
> Priority: Major
> Attachments: HDFS-13872-HDFS-12943.000.patch
>
>
> Currently the implementation of msync added in HDFS-13767 waits until the
> server has caught up to the client-specified transaction ID regardless of
> what the inbound RPC is. This particularly causes problems for
> ObserverReadProxyProvider (see HDFS-13779) when we try to fetch the state
> from an observer/standby; this should be a quick operation, but it has to
> wait for the node to catch up to the most current state. I initially thought
> all {{HAServiceProtocol}} methods should thus be excluded from the wait
> period, but actually I think the right approach is that _only_
> {{ClientProtocol}} methods should be subjected to the wait period. I propose
> that we can do this via an annotation on client protocol which can then be
> checked within {{ipc.Server}}.
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