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https://issues.apache.org/jira/browse/HDFS-10714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15471097#comment-15471097
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Yongjun Zhang commented on HDFS-10714:
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Hi [~brahmareddy] and [~vinayrpet], Thanks for working on this.
When visiting this issue (per discussion in HDFS-6937),
{quote}
DN1->DN2->DN3 => DN3 Gives ERROR_CHECKSUM ack. And so DN2 marked as bad
{quote}
In HDFS-6937 case, if DN3 gives ERROR_CHECKSUM error, DN3 will be replaced. But
here DN2 got replaced. Would you please add some code snippet to explain how
that happened? thanks.
> 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
> Assignee: Brahma Reddy Battula
> Attachments: HDFS-10714-01-draft.patch
>
>
> 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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