Xiaoqiao He created HDFS-15397:
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Summary: Blocks recovery could overwhelm KDC when using Kerberos
for authentication
Key: HDFS-15397
URL: https://issues.apache.org/jira/browse/HDFS-15397
Project: Hadoop HDFS
Issue Type: Improvement
Components: datanode
Reporter: Xiaoqiao He
It could overwhelm KDC if enable Kerberos for authentication when there are
large number of blocks are triggered to recovery.
Consider killing one running application which opens large number files and
writing, it will trigger block recovery, If `recoverblocks` commands are not
under control, there will be huge number pairs between two DataNode need to
auth when recovery, then it will overwhelm KDC if we enable Kerberos for
authentication.
I would like to attach more information about the corner case.
Technically, we should control the concurrency when there are large number
blocks need to recovery IMO.
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