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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9239) DataNode Lifeline Protocol: an alternative protocol for reporting DataNode liveness
Date Wed, 14 Oct 2015 09:09:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14956523#comment-14956523
] 

Steve Loughran commented on HDFS-9239:
--------------------------------------

Does this actually need RPC? Or could some UDP packet be submitted, with the recipient doing
an initial auth check of the sender, then queuing it to update the internal state. After all,
this is intended to be one-way announcements

> 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
>
>
> 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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