[jira] [Assigned] (IMPALA-5473) Make diagnosing network issues easier

["Sahil Takiar (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-5473?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sahil Takiar reassigned IMPALA-5473:
------------------------------------

    Assignee:     (was: Michael Ho)

> Make diagnosing network issues easier
> -------------------------------------
>
>                 Key: IMPALA-5473
>                 URL: https://issues.apache.org/jira/browse/IMPALA-5473
>             Project: IMPALA
>          Issue Type: Task
>    Affects Versions: Impala 2.10.0
>            Reporter: Henry Robinson
>            Priority: Major
>
> With our current metrics in the profile, it's hard to debug queries that get slow throughput from their exchanges. 
> The following cases have different causes, but similar symptoms (e.g. a high {{InactiveTimer}} in the xchg profile):
> 1. Downstream sender does not produce rows quickly (perhaps because *its* child instances do not produce rows quickly).
> 2. Downstream sender can not _send_ rows quickly, perhaps because of network congestion.
> 3. Downstream sender does not start producing rows until some time after the upstream has started (captured by {{FirstBatchArrivalWaitTime}}).
> 4. Downstream sender does not close stream until some time after all rows are sent.
> We should try to improve these metrics so that all the information about who is slow, and why, is available clearly in the runtime profile. Distinguishing cases 1 and 2 is particularly important.



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