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From "Thejas M Nair (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-14263) Log message when HS2 query is waiting on compile lock
Date Fri, 22 Jul 2016 17:33:21 GMT

    [ https://issues.apache.org/jira/browse/HIVE-14263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15389882#comment-15389882
] 

Thejas M Nair commented on HIVE-14263:
--------------------------------------

Regarding tryLock. tryLock() doesn't honor the waiting queue, ie it jumps in middle of the
queue. So even if there are 10 other threads blocked on the lock call, a newer query might
get the lock. Giving priority to ones that have been waiting longer would result in more predictable
behavior for user.

Regagrding "lock acquired" message, for queries that don't immediately return results or print
another message, the users (and hadoop admins) are likely to suspect that it is still stuck
at waiting for lock. But it might be stuck somewhere else (maybe an issue with yarn for example).
Hopefully, the cases where query waits on the compile lock won't be that common.


> Log message when HS2 query is waiting on compile lock
> -----------------------------------------------------
>
>                 Key: HIVE-14263
>                 URL: https://issues.apache.org/jira/browse/HIVE-14263
>             Project: Hive
>          Issue Type: Bug
>          Components: HiveServer2
>            Reporter: Thejas M Nair
>            Assignee: Tao Li
>         Attachments: HIVE-14263.1.patch
>
>




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