daimin created HDFS-16509:
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Summary: 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: 3.3.2, 3.3.1
Reporter: daimin
Assignee: daimin
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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