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https://issues.apache.org/jira/browse/HDFS-16509?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaoqiao He resolved HDFS-16509.
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Fix Version/s: 3.4.0
Hadoop Flags: Reviewed
Resolution: Fixed
Committed to trunk. Thanks [~cndaimin] for your contributions.
> Fix decommission UnsupportedOperationException: Remove unsupported
> ------------------------------------------------------------------
>
> Key: HDFS-16509
> URL: https://issues.apache.org/jira/browse/HDFS-16509
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 3.3.1, 3.3.2
> Reporter: daimin
> Assignee: daimin
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Time Spent: 2h 50m
> Remaining Estimate: 0h
>
> We encountered an "UnsupportedOperationException: Remove unsupported" error
> when some datanodes were in decommission. The reason of the exception is that
> datanode.getBlockIterator() returns an Iterator does not support remove,
> however DatanodeAdminDefaultMonitor#processBlocksInternal invokes it.remove()
> when a block not found, e.g, the file containing the block is deleted.
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