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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1501) Block reports from all datanodes arrive at the namenode within a small band of time
Date Wed, 20 Jun 2007 18:51:26 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12506628
] 

Hadoop QA commented on HADOOP-1501:
-----------------------------------

+1

http://issues.apache.org/jira/secure/attachment/12360084/randomBlockReportInterval.patch applied
and successfully tested against trunk revision r548794.

Test results:   http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/312/testReport/
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/312/console

> Block reports from all datanodes arrive at the namenode within a small band of time
> -----------------------------------------------------------------------------------
>
>                 Key: HADOOP-1501
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1501
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: randomBlockReportInterval.patch
>
>
> I have a 2000 node cluster and the block report interval is set to 1 hour. Most block
report arrive within a few minutes of one another. For example, I have seen block reports
from all 2000 nodes arrive within 5 minutes of one another. This causes CPU overload on the
namenode, causing dropped calls in Call queue.
> My proposal is to make the datanode send a block report as soon as the datanode starts.
Then, it waits for a random time between 0 to 1 hour (the configured value) before sending
the nect block report. From then on, block reports from that datanode are sent once every
1 hour (the configured value).

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