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https://issues.apache.org/jira/browse/HDFS-684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12780996#action_12780996
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dhruba borthakur commented on HDFS-684:
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Is there a downside to crearting a HAR for every directory in the /raid
directory? This will imply that there will be one HAR for every data-set,
because a single data-set usually reside in one single directory.
If you create one RAID file for all files in a certain policy, and we RAID new
files eveyr hour based on that policy, then each of these iterations will have
to detele and recreate the entire HAR again, isn't it (I am assuming that you
cannot add/delete items to a previously created har file)
> Use HAR filesystem to merge parity files
> -----------------------------------------
>
> Key: HDFS-684
> URL: https://issues.apache.org/jira/browse/HDFS-684
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: contrib/raid
> Reporter: dhruba borthakur
> Assignee: Rodrigo Schmidt
>
> The HDFS raid implementation (HDFS-503) creates a parity file for every file
> that is RAIDed. This puts additional burden on the memory requirements of the
> namenode. It will be nice if the parity files are combined together using
> the HadoopArchive (har) format.
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