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https://issues.apache.org/jira/browse/HDFS-7467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14258172#comment-14258172
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Hari Sekhon commented on HDFS-7467:
-----------------------------------
There does need to be a way to figure out if a given file or directory of files
are using fallback storage.
There should also be a global method of seeing if any files are using fallback
storage as an indicator that there isn't enough SSD for example.
Adding this information to fsck seems like a sensible way to go - the main
question is how to represent that information concisely.
Are all storage policies in fallback storage equivalent to other storage
policies that this output can always be fully described by the percentages that
Tsz has suggested?
There should also be some warning messages as well in fsck for all files that
are unable to meet the requested ideal for their storage policy and are using
fallback storage, perhaps with a switch since that could become overly volumous
output.
Regards,
Hari Sekhon
http://www.linkedin.com/in/harisekhon
> Provide storage tier information for a directory via fsck
> ---------------------------------------------------------
>
> Key: HDFS-7467
> URL: https://issues.apache.org/jira/browse/HDFS-7467
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: balancer & mover
> Affects Versions: 2.6.0
> Reporter: Benoy Antony
> Assignee: Benoy Antony
> Attachments: HDFS-7467.patch
>
>
> Currently _fsck_ provides information regarding blocks for a directory.
> It should be augmented to provide storage tier information (optionally).
> The sample report could be as follows :
> {code}
> Storage Tier Combination # of blocks % of blocks
> DISK:1,ARCHIVE:2 340730 97.7393%
>
> ARCHIVE:3 3928 1.1268%
>
> DISK:2,ARCHIVE:2 3122 0.8956%
>
> DISK:2,ARCHIVE:1 748 0.2146%
>
> DISK:1,ARCHIVE:3 44 0.0126%
>
> DISK:3,ARCHIVE:2 30 0.0086%
>
> DISK:3,ARCHIVE:1 9 0.0026%
> {code}
>
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