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https://issues.apache.org/jira/browse/HDFS-15278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17087409#comment-17087409
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Yang Yun commented on HDFS-15278:
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Thanks [~liuml07] for the review.
Yes, our use case can be satisfied if enable the
CreateFlag::IGNORE_CLIENT_LOCALITY, Thanks! The pain is that all user have to
change their code with this flag.
Currently, this feature is triggered only by setReplication to 1. With history
chosen information, I think the it's more easy to implement the creating 1
replica file.
Update to patch HDFS-15278.003.patch, define the sequentialBlocksDispersed as
final.
> After execute ‘-setrep 1’, make sure that blocks of the file are dispersed
> across different datanodes
> -----------------------------------------------------------------------------------------------------
>
> Key: HDFS-15278
> URL: https://issues.apache.org/jira/browse/HDFS-15278
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Yang Yun
> Assignee: Yang Yun
> Priority: Minor
> Attachments: HDFS-15278.001.patch, HDFS-15278.002.patch,
> HDFS-15278.003.patch
>
>
> After execute ‘-setrep 1’, many of blocks of the file may locate on same
> machine. Especially the file is written on one datanode machine. That causes
> data hot spots and is hard to fix if this machine is down.
> Add a chosen history to make sure that blocks of the file are dispersed
> across different datanodes.
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