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https://issues.apache.org/jira/browse/HDFS-13688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16545898#comment-16545898
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Chen Liang commented on HDFS-13688:
-----------------------------------
I was rebasing the patch, and I found that one of my tests failed. After
looking into it, it seems that it was caused by that in the final committed
version of HDFS-12976, {{isObserverState}} has changed. It gets called on
initialization of {{ObserverReadProxyProvider}}. In current new
{{isObserverState}} call, it makes an RPC call to every NameNode. As a side
effect, this RPC call will also set up client side state id. In which case,
even for a fresh client, it will have state id set after
{{ObserverReadProxyProvider}} gets created, so there is no longer the need to
explicitly making a call to set state id for fresh clients. I will post another
patch to reflect this change.
> Introduce msync API call
> ------------------------
>
> Key: HDFS-13688
> URL: https://issues.apache.org/jira/browse/HDFS-13688
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Chen Liang
> Assignee: Chen Liang
> Priority: Major
> Attachments: HDFS-13688-HDFS-12943.WIP.002.patch,
> HDFS-13688-HDFS-12943.WIP.patch
>
>
> As mentioned in the design doc in HDFS-12943, to ensure consistent read, we
> need to introduce an RPC call {{msync}}. Specifically, client can issue a
> msync call to Observer node along with a transactionID. The msync will only
> return when the Observer's transactionID has caught up to the given ID. This
> JIRA is to add this API.
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