[jira] [Commented] (IMPALA-14881) Scanner threads can have incorrect instance id with mt_dop=0

["Csaba Ringhofer (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IMPALA-14881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18071970#comment-18071970 ] 

Csaba Ringhofer commented on IMPALA-14881:
------------------------------------------

https://gerrit.cloudera.org/#/c/24174/

> Scanner threads can have incorrect instance id with mt_dop=0
> ------------------------------------------------------------
>
>                 Key: IMPALA-14881
>                 URL: https://issues.apache.org/jira/browse/IMPALA-14881
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Backend
>            Reporter: Csaba Ringhofer
>            Assignee: Csaba Ringhofer
>            Priority: Major
>
> IMPALA-6416 added automatic setting of instance id based on parent thread, but for scanner threads the parent thread can belong to an unrelated thread that releases a thread token.
> The problematic change:
> https://gerrit.cloudera.org/#/c/9053/9/be/src/exec/hdfs-scan-node.cc
> ThreadTokenAvailableCb can be called from outside the instance through as it is registered in ThreadResourcePool::AddThreadAvailableCb



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