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Date: Mon, 7 Nov 2011 23:30:53 +0000 (UTC)
From: "Amr Awadallah (Commented) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-611) Heartbeats times from Datanodes
 increase when there are plenty of blocks to delete
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    [ https://issues.apache.org/jira/browse/HDFS-611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13145942#comment-13145942 ] 

Amr Awadallah commented on HDFS-611:
------------------------------------

I am out of office on a business trip for next couple of days. I will
be slower than usual in responding to emails. If this is urgent then
please call my cell phone (or send an SMS), otherwise I will reply to
your email next week when I get back.

Thanks for your patience,

-- amr

                
> Heartbeats times from Datanodes increase when there are plenty of blocks to delete
> ----------------------------------------------------------------------------------
>
>                 Key: HDFS-611
>                 URL: https://issues.apache.org/jira/browse/HDFS-611
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 0.20.1, 0.21.0, 0.22.0
>            Reporter: dhruba borthakur
>            Assignee: Zheng Shao
>             Fix For: 0.21.0
>
>         Attachments: HDFS-611-branch-0.20-security.patch, HDFS-611.branch-19.patch, HDFS-611.branch-19.v2.patch, HDFS-611.branch-20.patch, HDFS-611.branch-20.v2.patch, HDFS-611.branch-20.v6.patch, HDFS-611.trunk.patch, HDFS-611.trunk.v2.patch, HDFS-611.trunk.v3.patch, HDFS-611.trunk.v4.patch, HDFS-611.trunk.v5.patch, HDFS-611.trunk.v6.patch
>
>
> I am seeing that when we delete a large directory that has plenty of blocks, the heartbeat times from datanodes increase significantly from the normal value of 3 seconds to as large as 50 seconds or so. The heartbeat thread in the Datanode deletes a bunch of blocks sequentially, this causes the heartbeat times to increase.

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