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https://issues.apache.org/jira/browse/HDFS-9040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14742796#comment-14742796
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Walter Su commented on HDFS-9040:
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bq. preallocate GS when NN creates a new striped block group
(FSN#createNewBlock). For each new striped block group we can reserve
NUM_PARITY_BLOCKS GS's. Then steps 1~3 in the above sequence can be saved.
Good idea Zhe. I have a concern that every time {{createBlockOutputStream}}
requires a fresh blockToken. (It doesn't matter token expires during streaming.)
> Erasure coding: A BlockGroupDataStreamer to rule all internal blocks streamers
> ------------------------------------------------------------------------------
>
> Key: HDFS-9040
> URL: https://issues.apache.org/jira/browse/HDFS-9040
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Walter Su
> Assignee: Walter Su
> Attachments: HDFS-9040.00.patch, HDFS-9040.001.wip.patch
>
>
> A {{BlockGroupDataStreamer}} to communicate with NN to allocate/update block,
> and {{StripedDataStreamer}} s only have to stream blocks to DNs.
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