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https://issues.apache.org/jira/browse/HDFS-9261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14975896#comment-14975896
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Rakesh R commented on HDFS-9261:
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Thanks [~umamaheswararao] for the advice.
{{TestDFSStripedOutputStreamWithFailure#testMultipleDatanodeFailure56}} ->
dnIndexSuite 6, 7, 8, is covering all parity datanodes failures.
I've done minor updates. Attached new patch including debugging message. Please
review it again!
> Erasure Coding: Skip encoding the data cells if all the parity data streamers
> are failed for the current block group
> --------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-9261
> URL: https://issues.apache.org/jira/browse/HDFS-9261
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Rakesh R
> Assignee: Rakesh R
> Priority: Minor
> Attachments: HDFS-9261-00.patch, HDFS-9261-01.patch
>
>
> {{DFSStripedOutputStream}} will continue writing with minimum number
> (dataBlockNum) of live datanodes. It won't replace the failed datanodes
> immediately for the current block group. Consider a case where all the parity
> data streamers are failed, now it is unnecessary to encode the data block
> cells and generate the parity data. This is a corner case where it can skip
> {{writeParityCells()}} step.
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