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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5287) Provide option to skip updates of ephemeral state changes in Zookeeper
Date Mon, 27 Feb 2017 18:03:45 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15886231#comment-15886231
] 

ASF GitHub Bot commented on DRILL-5287:
---------------------------------------

Github user ppadma commented on a diff in the pull request:

    https://github.com/apache/drill/pull/758#discussion_r103271146
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/ExecConstants.java ---
    @@ -413,4 +413,8 @@
     
       String DYNAMIC_UDF_SUPPORT_ENABLED = "exec.udf.enable_dynamic_support";
       BooleanValidator DYNAMIC_UDF_SUPPORT_ENABLED_VALIDATOR = new BooleanValidator(DYNAMIC_UDF_SUPPORT_ENABLED,
true, true);
    +
    +  String ZK_QUERY_STATE_UPDATE_KEY = "drill.exec.zk.query.state.update";
    --- End diff --
    
    I changed it to QUERY_TRANSIENT_STATE_UPDATE_KEY  and exec.query.progress.update. Please
review the new diffs. 


> Provide option to skip updates of ephemeral state changes in Zookeeper
> ----------------------------------------------------------------------
>
>                 Key: DRILL-5287
>                 URL: https://issues.apache.org/jira/browse/DRILL-5287
>             Project: Apache Drill
>          Issue Type: Bug
>    Affects Versions: 1.9.0
>            Reporter: Padma Penumarthy
>            Assignee: Padma Penumarthy
>             Fix For: 1.10
>
>
> We put transient profiles in zookeeper and update state as query progresses and changes
states. It is observed that this adds latency of ~45msec for each update in the query execution
path. This gets even worse when high number of concurrent queries are in progress. For concurrency=100,
the average query response time even for short queries  is 8 sec vs 0.2 sec with these updates
disabled. For short lived queries in a high-throughput scenario, it is of no value to update
state changes in zookeeper. We need an option to disable these updates for short running operational
queries.



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