Details
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Bug
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Status: Patch Available
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Major
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Resolution: Unresolved
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None
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Description
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.