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https://issues.apache.org/jira/browse/HDFS-9040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14900554#comment-14900554
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Walter Su commented on HDFS-9040:
---------------------------------
If it's a "append()" recovery, of course we should NOT truncate any data.(Or
truncate last stripe of *parity* blocks to make outputstream easier. We can
discuss it later.)
If it's a "recovery" recovery, truncate last stripe is not a bad choice, even
if no corrupted replica. So after lease reclaimed by other client, he doesn't
have to worry last stripe parity re-encoding)
> Erasure coding: Refactor DFSStripedOutputStream (Move Namenode RPC Requests
> to Coordinator)
> -------------------------------------------------------------------------------------------
>
> Key: HDFS-9040
> URL: https://issues.apache.org/jira/browse/HDFS-9040
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Walter Su
> Attachments: HDFS-9040-HDFS-7285.002.patch,
> HDFS-9040-HDFS-7285.003.patch, HDFS-9040.00.patch, HDFS-9040.001.wip.patch,
> HDFS-9040.02.bgstreamer.patch
>
>
> The general idea is to simplify error handling logic.
> Proposal 1:
> A BlockGroupDataStreamer to communicate with NN to allocate/update block, and
> StripedDataStreamer s only have to stream blocks to DNs.
> Proposal 2:
> See below the
> [comment|https://issues.apache.org/jira/browse/HDFS-9040?focusedCommentId=14741388&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14741388]
> from [~jingzhao].
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