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From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-1694) Update statistics fail to complete when client disconnects
Date Tue, 03 Mar 2015 23:38:04 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-1694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14346014#comment-14346014
] 

James Taylor commented on PHOENIX-1694:
---------------------------------------

I suppose it depends on the client workload. If the UPDATE STATISTICS command is only queued
on the client, and the client disconnects, the work would be canceled. If the command has
started on the server, then it should just keep chugging along until finished (regardless
of what the client does, as the updates to the STATS table occur within the coprocessor).
Does this match what you observe? Also, note that upon completion on the server, the phoenix.stats.updateFrequency
time would need to expire before the server (and subsequently, the client) sees the stats.
I believe you could short-circuit this wait time by running another UPDATE STATISTICS command
(once the STATS table is populated).

We should support the ASYNC keyword perhaps for UPDATE STATISTICS.

> Update statistics fail to complete when client disconnects
> ----------------------------------------------------------
>
>                 Key: PHOENIX-1694
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-1694
>             Project: Phoenix
>          Issue Type: Bug
>    Affects Versions: 5.0.0, 4.3
>         Environment: HBase 0.98.10, Phoenix 4.3 branch
>            Reporter: Mujtaba Chohan
>            Assignee: James Taylor
>            Priority: Minor
>
> [~jamestaylor] You mentioned that after initiating _update statistics_ command even if
client disconnects, statistics would still get generated by server side process. 
> Just checked it this. As soon as client disconnects stats table population halts if client
disconnects any time after update statistics command is issued.



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