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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10714) Issue in handling checksum errors in write pipeline when fault DN is LAST_IN_PIPELINE
Date Tue, 02 Aug 2016 04:12:20 GMT
Brahma Reddy Battula created HDFS-10714:
-------------------------------------------

             Summary: Issue in handling checksum errors in write pipeline when fault DN is
LAST_IN_PIPELINE
                 Key: HDFS-10714
                 URL: https://issues.apache.org/jira/browse/HDFS-10714
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Brahma Reddy Battula


We had come across one issue, where write is failed even 7 DN’s are available due to network
fault at one datanode which is LAST_IN_PIPELINE. It will be similar to HDFS-6937 .

Scenario : (DN3 has N/W Fault and Min repl=2).

Write pipeline:
DN1->DN2->DN3  => DN3 Gives ERROR_CHECKSUM ack. And so DN2 marked as bad
DN1->DN4-> DN3 => DN3 Gives ERROR_CHECKSUM ack. And so DN4 is marked as bad
….
And so on ( all the times DN3 is LAST_IN_PIPELINE) ... Continued till no more datanodes to
construct the pipeline.




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