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From "Jingyun Tian (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-19290) Reduce zk request when doing split log
Date Tue, 21 Nov 2017 10:29:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-19290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16260541#comment-16260541
] 

Jingyun Tian commented on HBASE-19290:
--------------------------------------

{code}
343	    int expectedTasksPerRS = (numTasks / availableRSs) + ((numTasks % availableRSs ==
0) ? 0 : 1);
344	    expectedTasksPerRS = Math.max(1, expectedTasksPerRS); // at least be one
{code}
Since expectedTasksPerRS only relay on availableRSs and numTasks, I think it is better to
move them to getAvailableRSs() and change a name?

> Reduce zk request when doing split log
> --------------------------------------
>
>                 Key: HBASE-19290
>                 URL: https://issues.apache.org/jira/browse/HBASE-19290
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: binlijin
>            Assignee: binlijin
>         Attachments: HBASE-19290.master.001.patch, HBASE-19290.master.002.patch, HBASE-19290.master.003.patch
>
>
> We observe once the cluster has 1000+ nodes and when hundreds of nodes abort and doing
split log, the split is very very slow, and we find the regionserver and master wait on the
zookeeper response, so we need to reduce zookeeper request and pressure for big cluster.
> (1) Reduce request to rsZNode, every time calculateAvailableSplitters will get rsZNode's
children from zookeeper, when cluster is huge, this is heavy. This patch reduce the request.

> (2) When the regionserver has max split tasks running, it may still trying to grab task
and issue zookeeper request, we should sleep and wait until we can grab tasks again.  



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