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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9239) DataNode Lifeline Protocol: an alternative protocol for reporting DataNode liveness
Date Fri, 04 Mar 2016 18:58:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15180374#comment-15180374
] 

Chris Nauroth commented on HDFS-9239:
-------------------------------------

The test failures are unrelated.  The remaining style warnings are not worth addressing. 
[~szetszwo], would you please take a look at patch v003 and my comments that go with it? 
Thank you.

> DataNode Lifeline Protocol: an alternative protocol for reporting DataNode liveness
> -----------------------------------------------------------------------------------
>
>                 Key: HDFS-9239
>                 URL: https://issues.apache.org/jira/browse/HDFS-9239
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: datanode, namenode
>            Reporter: Chris Nauroth
>            Assignee: Chris Nauroth
>         Attachments: DataNode-Lifeline-Protocol.pdf, HDFS-9239.001.patch, HDFS-9239.002.patch,
HDFS-9239.003.patch
>
>
> This issue proposes introduction of a new feature: the DataNode Lifeline Protocol.  This
is an RPC protocol that is responsible for reporting liveness and basic health information
about a DataNode to a NameNode.  Compared to the existing heartbeat messages, it is lightweight
and not prone to resource contention problems that can harm accurate tracking of DataNode
liveness currently.  The attached design document contains more details.



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