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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7264) Tha last datanode in a pipeline should send a heartbeat when there is no traffic
Date Sun, 19 Oct 2014 01:31:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14176190#comment-14176190
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Tsz Wo Nicholas Sze commented on HDFS-7264:
-------------------------------------------

> Shouldn't we add the heartbeat packet to the front of the queue?

The queue is empty.  So it is the same.

> org.apache.hadoop.hdfs.TestLeaseRecovery2

I cannot reproduce the failure of TestLeaseRecovery2.  It seems not related.  

> Tha last datanode in a pipeline should send a heartbeat when there is no traffic
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-7264
>                 URL: https://issues.apache.org/jira/browse/HDFS-7264
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>         Attachments: h7264_20141017.patch
>
>
> When the client is writing slowly, the client will send a heartbeat to signal that the
connection is still alive.  This case works fine.
> However, when a client is writing fast but some of the datanodes in the pipeline are
busy, a PacketResponder may get a timeout since no ack is sent from the upstream datanode.
 We suggest that the last datanode in a pipeline should send a heartbeat when there is no
traffic.



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