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https://issues.apache.org/jira/browse/HDFS-9239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16844457#comment-16844457
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Feng Yuan commented on HDFS-9239:
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Hi [~cnauroth], there is still block issue.
org.apache.hadoop.hdfs.server.datanode.BPServiceActor.LifelineSender#sendLifeline
bpos.getBlockPoolId readLock，but processcommand hold the writeLock
> 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
> Priority: Major
> Fix For: 2.8.0, 3.0.0-alpha1
>
> 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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