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https://issues.apache.org/jira/browse/HDFS-15900?focusedWorklogId=568726&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-568726
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ASF GitHub Bot logged work on HDFS-15900:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 19/Mar/21 01:42
Start Date: 19/Mar/21 01:42
Worklog Time Spent: 10m
Work Description: hdaikoku opened a new pull request #2787:
URL: https://github.com/apache/hadoop/pull/2787
https://issues.apache.org/jira/browse/HDFS-15900
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Issue Time Tracking
-------------------
Worklog Id: (was: 568726)
Remaining Estimate: 0h
Time Spent: 10m
> RBF: empty blockpool id on dfsrouter caused by UNAVAILABLE NameNode
> -------------------------------------------------------------------
>
> Key: HDFS-15900
> URL: https://issues.apache.org/jira/browse/HDFS-15900
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: rbf
> Affects Versions: 3.3.0
> Reporter: Harunobu Daikoku
> Assignee: Harunobu Daikoku
> Priority: Major
> Attachments: image.png
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> We observed that when a NameNode becomes UNAVAILABLE, the corresponding
> blockpool id in MembershipStoreImpl#activeNamespaces on dfsrouter
> unintentionally sets to empty, its initial value.
> !image.png|height=250!
> As a result of this, concat operations through dfsrouter fail with the
> following error as it cannot resolve the block id in the recognized active
> namespaces.
> {noformat}
> Caused by:
> org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.RemoteException):
> Cannot locate a nameservice for block pool BP-...
> {noformat}
> A possible fix is to ignore UNAVAILABLE NameNode registrations, and set
> proper namespace information obtained from available NameNode registrations
> when constructing the cache of active namespaces.
>
> [https://github.com/apache/hadoop/blob/rel/release-3.3.0/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/store/impl/MembershipStoreImpl.java#L207-L221]
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