[jira] [Created] (HDFS-15900) RBF: empty blockpool id on dfsrouter caused by UNAVAILABLE NameNode

["Harunobu Daikoku (Jira)" <ji...@apache.org>]

Harunobu Daikoku created HDFS-15900:
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             Summary: 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
         Attachments: image.png

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! 

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 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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