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https://issues.apache.org/jira/browse/HBASE-3438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12987593#action_12987593
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Wayne commented on HBASE-3438:
------------------------------
We now assume this is caused by a memstore flush. See
https://issues.apache.org/jira/browse/HBASE-3483.
> Cluster Wide Pauses
> -------------------
>
> Key: HBASE-3438
> URL: https://issues.apache.org/jira/browse/HBASE-3438
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.89.20100924
> Environment: CentOS 5.5, 10 Nodes, 24GB RAM, 4 1TB Disks, 8GB Heap
> Reporter: Wayne
>
> Under heavy write load the entire cluster seems to pause with all nodes
> pausing writes/reads for several seconds at a time. This seems to be worse
> with larger region sizes. One possible explanation is that a single node gets
> caught/paused/stuck during a split and that all other nodes are waiting on
> that one node so it looks like a cluster wide pause.
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