Yuanbo Liu created HDFS-11293:
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Summary: FsDatasetImpl throws ReplicaAlreadyExistsException in a
wrong situation
Key: HDFS-11293
URL: https://issues.apache.org/jira/browse/HDFS-11293
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Yuanbo Liu
Assignee: Yuanbo Liu
Priority: Critical
In {{FsDatasetImpl#createTemporary}}, we use {{volumeMap}} to get replica info
by block pool id. But in this situation:
{code}
datanode A => {DISK, SSD}, datanode B => {DISK, ARCHIVE}.
1. the same block replica exists in A[DISK] and B[DISK].
2. the block pool id of datanode A and datanode B are the same.
{code}
Then we start to change the file's storage policy and move the block replica in
the cluster. Very likely we have to move block from B[DISK] to A[SSD], at this
time, datanode A throws ReplicaAlreadyExistsException and it's not a correct
behavior.
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