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Date: Fri, 11 Sep 2009 01:17:57 -0700 (PDT)
From: "dhruba borthakur (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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=12754040#action_12754040 ] 

dhruba borthakur commented on HDFS-611:
---------------------------------------

> The datanode might remove blocks immediately from its in-memory lists that are used to generate block reports but the background thread could remove the actual block files

that will work too. will submit a patch soon.

> 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
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>
> 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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