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https://issues.apache.org/jira/browse/HDFS-13777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16574678#comment-16574678
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Ewan Higgs commented on HDFS-13777:
-----------------------------------
003
- Added patch with further test for showing that when a sync is complete, the
overreplication detection kicks in and thins the blocks so we have only the
required replicas (i.e. {{[DISK, DISK, DISK]}} -> {{[DISK, PROVIDED]}}.
- Add PROVIDED_ONLY storage policy which further demonstrates the above so
{{[DISK, DISK, DISK]}} becomes {{[PROVIDED]}}
> [PROVIDED Phase 2] Scheduler in the NN for distributing DNA_BACKUP work.
> ------------------------------------------------------------------------
>
> Key: HDFS-13777
> URL: https://issues.apache.org/jira/browse/HDFS-13777
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Ewan Higgs
> Assignee: Ewan Higgs
> Priority: Major
> Attachments: HDFS-13777-HDFS-12090.001.patch,
> HDFS-13777-HDFS-12090.002.patch, HDFS-13777-HDFS-12090.003.patch
>
>
> When the SyncService is running, it should periodically take snapshots, make
> a snapshotdiff, and then distribute DNA_BACKUP work to the Datanodes (See
> HDFS-13421). Upon completion of the work, the NN should update the AliasMap.
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