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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3438) Cluster Wide Pauses
Date Wed, 12 Jan 2011 20:04:47 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12980891#action_12980891

Jonathan Gray commented on HBASE-3438:

Can you add instrumentation in your clients?  Is there something in common with the operation
they get blocked on?  (same row or same region, perhaps)

> 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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