Uma Maheswara Rao G created HDFS-15625:
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Summary: Namenode trashEmptier should not init ViewFs on startup
Key: HDFS-15625
URL: https://issues.apache.org/jira/browse/HDFS-15625
Project: Hadoop HDFS
Issue Type: Sub-task
Components: namenode, viewfs
Affects Versions: 3.4.0
Reporter: Uma Maheswara Rao G
Assignee: Uma Maheswara Rao G
Currently on NN startup, Namenode starts trash emptier.
As part of HDFS-15450 we already fixed it by setting fs.hdfs.impl config in NN.
But as part of other JIRAs we seem to be reverted that change.
If I remember correctly, the issue in HDFS-15450 was about NN can't init
ViewFsOverloadScheme because, NN always sets it's RPC address in fs.defaultFS.
So, in HA case, user configured uri would always be a logical uri. So, NN could
not start it as it can't init because it can't find any mount points with that
changed fs.defaultFS authority. However that issues sorted out as for HDFS we
recommend to use ViewHDFS and it will auto set a fallback mountpoint if no
mount points configured.
However, we still need that changes needed back as initing
ViewHDFS/ViewFSOverloadScheme would be costly when it has more mount points.
Initing this mount based fs in trashEmptier is unnecessary.
With this JIRA I will just bring back similar functionality back.
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