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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-611) Heartbeats times from Datanodes increase when there are plenty of blocks to delete
Date Thu, 05 Nov 2009 20:24:32 GMT

    [ https://issues.apache.org/jira/browse/HDFS-611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12774062#action_12774062
] 

Konstantin Shvachko commented on HDFS-611:
------------------------------------------

It is better to keep the whole implementation in one place rather than sread it between classes.
That makes it modifications easier.
When you decide to move AsyncDiskService to common you can move current implementation of
it and create a new class DataNodeAsyncDiskService, which either extends AsyncDiskService
or encapsulates it, whatever is better.

> 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: 0.20.2, 0.21.0, 0.22.0
>
>         Attachments: HDFS-611.branch-19.patch, HDFS-611.branch-19.v2.patch, HDFS-611.branch-20.patch,
HDFS-611.branch-20.v2.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
>
>
> 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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