[jira] [Commented] (DRILL-4681) ChannelClosedException causes all queries which are communicating on that channel to fail

["Deneche A. Hakim (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-4681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15287630#comment-15287630 ] 

Deneche A. Hakim commented on DRILL-4681:
-----------------------------------------

[~rkins] can you explain what you mean by "even though the fragments themselves eventually run to completion" ?

My understanding is that Drill will fail all fragments that were sending batches through the closed channel and didn't yet receive an ACK, so those batches are assumed to be lost.

> ChannelClosedException causes all queries which are communicating on that channel to fail 
> ------------------------------------------------------------------------------------------
>
>                 Key: DRILL-4681
>                 URL: https://issues.apache.org/jira/browse/DRILL-4681
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Flow, Execution - RPC
>    Affects Versions: 1.7.0
>            Reporter: Rahul Challapalli
>
> commit # : 09b262776e965ea17a6a863801f7e1ee3e5b3d5a
> Below is what I am describing:
>     1. One of the fragments cause a channel closed exception (due to an OOM or some other condition)
>     2. Drill fails all other fragments which are running at that time even though the fragments themselves eventually run to completion. At a high concurrency this could lead a lot of query failures.



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