[jira] [Created] (HDFS-11708) positional read will fail if replicas moved to different DNs after stream is opened

["Vinayakumar B (JIRA)" <ji...@apache.org>]

Vinayakumar B created HDFS-11708:
------------------------------------

             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)"



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)

---------------------------------------------------------------------
To unsubscribe, e-mail: hdfs-dev-unsubscribe@hadoop.apache.org
For additional commands, e-mail: hdfs-dev-help@hadoop.apache.org