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From "Wayne (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3438) Cluster Wide Pauses
Date Thu, 27 Jan 2011 14:56:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12987593#action_12987593
] 

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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