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