Brahma Reddy Battula created HDFS-10714:
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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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