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https://issues.apache.org/jira/browse/HDFS-12914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16859272#comment-16859272
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star commented on HDFS-12914:
-----------------------------
Yes client refers to datanode. DN get REGISTER command after the startup of NN
and make fullblock report every 6 hours. It's ok to send other rpc request to
NameNode after its first REGISTER command. No need to register again just in
case of full block lease id expiration. Feel free to ignore this if doesn't
make sense to you.
{code:java}
I think `client` you mentioned is Datanode, right? If one datanode not register
and send some other RPC request to NameNode, it should get
RegisterCommand.REGISTER and try to re-register. It seems a normal flow.
Thanks Íñigo Goiri and star again. HDFS-12914.007.patch please take another
kindly review.
{code}
> Block report leases cause missing blocks until next report
> ----------------------------------------------------------
>
> Key: HDFS-12914
> URL: https://issues.apache.org/jira/browse/HDFS-12914
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.8.0, 2.9.2
> Reporter: Daryn Sharp
> Assignee: Santosh Marella
> Priority: Critical
> Attachments: HDFS-12914-branch-2.001.patch,
> HDFS-12914-trunk.00.patch, HDFS-12914-trunk.01.patch, HDFS-12914.005.patch,
> HDFS-12914.006.patch, HDFS-12914.007.patch
>
>
> {{BlockReportLeaseManager#checkLease}} will reject FBRs from DNs for
> conditions such as "unknown datanode", "not in pending set", "lease has
> expired", wrong lease id, etc. Lease rejection does not throw an exception.
> It returns false which bubbles up to {{NameNodeRpcServer#blockReport}} and
> interpreted as {{noStaleStorages}}.
> A re-registering node whose FBR is rejected from an invalid lease becomes
> active with _no blocks_. A replication storm ensues possibly causing DNs to
> temporarily go dead (HDFS-12645), leading to more FBR lease rejections on
> re-registration. The cluster will have many "missing blocks" until the DNs
> next FBR is sent and/or forced.
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