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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 Wed, 04 Nov 2009 03:22:32 GMT

    [ https://issues.apache.org/jira/browse/HDFS-611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12773368#action_12773368
] 

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

I like AsyncDiskService. Not sure about MR usage but we can definitely add more data-node
operations under the class that require async operations.
Two things:
# It would look really good if you could move the deleteAsync() method together with the static
class ReplicaFileDeleteClass inside AsyncDiskService. I understand your motivation that you
want to keep AsyncDiskService independent of data-node connotations if the goal is to reuse
it in MR, but this could be done by simple factoring our the common base class if such usage
in MR will ever materialize.
# A nit: could you convert the comment for AsyncDiskService to JavaDoc comment by just adding
one more star.

Other than that the patch looks good. Test failure is related to HDFS-733.

> 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
>
>
> 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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