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https://issues.apache.org/jira/browse/HBASE-3438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12981744#action_12981744
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Wayne commented on HBASE-3438:
------------------------------
After 2 more days of testing I think I can confirm your assumption. When we are
writing to multiple tables we never see cluster wide pauses. This is a slow
split in conjunction with meta table updates that cause all workers to be stuck
on a hot region. Why would a split take 10 seconds and what can be done to
minimize this pause?
> 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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