[jira] [Commented] (HBASE-24956) ConnectionManager#locateRegionInMeta waits for user region lock indefinitely.

["Bharath Vissapragada (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-24956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17185500#comment-17185500 ] 

Bharath Vissapragada commented on HBASE-24956:
----------------------------------------------

The code has been heavily refactored in the other branches but it'd be good to double check if this applies (in some other form) to other branches (master/branch-2).

> ConnectionManager#locateRegionInMeta waits for user region lock indefinitely.
> -----------------------------------------------------------------------------
>
>                 Key: HBASE-24956
>                 URL: https://issues.apache.org/jira/browse/HBASE-24956
>             Project: HBase
>          Issue Type: Bug
>          Components: Client
>    Affects Versions: 1.3.2, 1.7.0
>            Reporter: Rushabh Shah
>            Assignee: Rushabh Shah
>            Priority: Major
>
> One of our customers experienced high latencies (in order of 3-4 minutes) for point lookup query (We use phoenix on top of hbase).
> We have different threads sharing the same hconnection.  Looks like multiple threads are stuck at the same place. [https://github.com/apache/hbase/blob/branch-1.3/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionManager.java#L1282] 
> We have set the following configuration parameters to ensure query fails with a reasonable SLAs:
> 1. hbase.client.meta.operation.timeout
> 2. hbase.client.operation.timeout
> 3. hbase.client.scanner.timeout.period
> But since  userRegionLock can wait for lock indefinitely the call will not fail within SLA.



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