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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-611) Heartbeats times from Datanodes increase when there are plenty of blocks to delete
Date Wed, 28 Oct 2009 21:40:59 GMT

     [ https://issues.apache.org/jira/browse/HDFS-611?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zheng Shao updated HDFS-611:
----------------------------

    Attachment: HDFS-611.branch-19.patch

This patch adds a new class BlockFileDeleter, which delete block files asynchronously using
one ThreadPoolExecutor for each volume. BlockFileDeleter is used internally in FSDataset.


> 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: Zheng Shao
>         Attachments: HDFS-611.branch-19.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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