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From "Weiwei Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12329) Ozone: Ratis: Readonly calls in XceiverClientRatis should use sendReadOnly
Date Fri, 15 Sep 2017 04:17:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16167302#comment-16167302
] 

Weiwei Yang commented on HDFS-12329:
------------------------------------

I see, SCM node manager has some lag on reporting DN states, check the state from datanode
side makes sense in this case. I am +1 on the v2 patch. 2 minor comments on the logging,

LOG.info("sendCommand {} {}", isReadOnlyRequest, request);
>>
LOG.debug("sendCommand: {}, read only requst: {}", request, isReadOnlyRequest);

LOG.info("reply {} {}", isReadOnlyRequest, reply);
>>
LOG.debug("reply: {}, read only request: {}", reply, isReadOnlyRequest);

Thanks

> Ozone: Ratis: Readonly calls in XceiverClientRatis should use sendReadOnly
> --------------------------------------------------------------------------
>
>                 Key: HDFS-12329
>                 URL: https://issues.apache.org/jira/browse/HDFS-12329
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>    Affects Versions: HDFS-7240
>            Reporter: Mukul Kumar Singh
>            Assignee: Mukul Kumar Singh
>              Labels: OzonePostMerge
>             Fix For: HDFS-7240
>
>         Attachments: HDFS-12329-HDFS-7240.001.patch, HDFS-12329-HDFS-7240.002.patch
>
>
> Currently both write and readonly calls in Ratis use RaftClient.send which enqueues the
the request to the raft log and is processed later when the log entry is consumed.
> Readonly call can be optimized by using RaftClient.sendReadOnly which will directly query
the RaftServer for a particular request.
> This jira will be used to discuss this issue.



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