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https://issues.apache.org/jira/browse/HDFS-13688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16742910#comment-16742910
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He Xiaoqiao commented on HDFS-13688:
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Thanks all for great work here.
I am confused about the new API #msync, from the design docs it introduces an
RPC call msync to ensure consistent read. IIUC application upon HDFS has to
adapt the new API if open 'Consistent Read' feature, this changes involve
complex works since there are more and more engine run on HDFS, I believe it is
a gigantic project if all compute engines to match this change. So my question
is any plan to restrain data consistent checking in DFSClient only? If I missed
something or understood incorrectly please correct me. Thanks again.
> 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
> Fix For: HDFS-12943, 3.3.0
>
> Attachments: HDFS-13688-HDFS-12943.001.patch,
> HDFS-13688-HDFS-12943.002.patch, HDFS-13688-HDFS-12943.002.patch,
> HDFS-13688-HDFS-12943.003.patch, HDFS-13688-HDFS-12943.004.patch,
> HDFS-13688-HDFS-12943.005.patch, 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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