Vinayakumar B created HDFS-11708:
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Summary: positional read will fail if replicas moved to different
DNs after stream is opened
Key: HDFS-11708
URL: https://issues.apache.org/jira/browse/HDFS-11708
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs-client
Affects Versions: 2.7.3
Reporter: Vinayakumar B
Assignee: Vinayakumar B
Priority: Critical
Scenario:
1. File was written to DN1, DN2 with RF=2
2. File stream opened to read and kept. Block Locations are [DN1,DN2]
3. One of the replica (DN2) moved to another datanode (DN3) due to datanode
dead/balancing/etc.
4. Latest block locations in NameNode will be DN1 and DN3.
5. DN1 went down, but not yet detected as dead in NameNode.
6. Client start reading using positional read api "read(pos, buf[], offset,
length)"
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