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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2981) Improve consistency of performance during heavy load
Date Fri, 10 Sep 2010 17:47:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12908117#action_12908117

Todd Lipcon commented on HBASE-2981:

Linked HBASE-2782 to add some QoS to META. We currently have a situation where if we have
some RS that's hosting META as well as some other region, and the other region gets blocked,
all of the handlers can fill up waiting for that region. Then all other clients end up getting
blocked from making progress since they can't reach META (or ROOT).

> Improve consistency of performance during heavy load
> ----------------------------------------------------
>                 Key: HBASE-2981
>                 URL: https://issues.apache.org/jira/browse/HBASE-2981
>             Project: HBase
>          Issue Type: Task
>          Components: regionserver
>            Reporter: Todd Lipcon
> Currently when running load tests like YCSB, we experience periods of complete cluster
inactivity while all clients are blocked on a single region which is unavailable.
> As discussed recently on the list, we should brainstorm some ideas for how to improve
the situation: the goal here is to (a) minimize the amount of time when a region is inaccessible,
and (b) minimize the impact that one inaccessible region has on other operations in the cluster.

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