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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7271) Have a single executor for all zkWorkers in the assignment manager
Date Thu, 06 Dec 2012 18:39:10 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13511603#comment-13511603
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Ted Yu commented on HBASE-7271:
-------------------------------

Patch v2 looks good. Following can be addressed on commit.
{code}
+    int workers = conf.getInt("hbase.assignment.zkevent.workers", 20);
{code}
nit: why the increase in number of workers ?
{code}
+            // now that we have finished, let see if there is an event for the same region
in the
{code}
nit: 'let see' -> "let's see"

                
> Have a single executor for all zkWorkers in the assignment manager
> ------------------------------------------------------------------
>
>                 Key: HBASE-7271
>                 URL: https://issues.apache.org/jira/browse/HBASE-7271
>             Project: HBase
>          Issue Type: Bug
>          Components: master, Region Assignment
>    Affects Versions: 0.96.0
>            Reporter: nkeywal
>            Assignee: nkeywal
>             Fix For: 0.96.0
>
>         Attachments: 7271.v1.patch, 7271.v2.patch, 7271.v2.patch
>
>
> The current strategy is to have an array of monothreaded executor, and hash the zk path
to ensure that there are no two events on the same region executed in parallel  
> I think a single executor, as presented in the attached patch, is better because:
> - we're guaranteed to use all threads at any time
> - if managing one of the event takes longer that expected, the slowness is limited to
this region, and not to all regions that have the same hashed/moduloed code
> - For the nodeChildrenChanged, there is no need to choose randomly one of the worker
(or, once again, the risk to get stuck if one of the event takes time to be managed).

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