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https://issues.apache.org/jira/browse/KUDU-2117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16144142#comment-16144142
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Andrew Wong commented on KUDU-2117:
-----------------------------------
See Todd's comment:
bq. More than just switching to the WAL dir, we may want to allow striping
across all of the disks, given that many users don't have SSDs. Striping across
12 spinning disks gives a 12x speedup vs trying to fit them all into one.
> Spread metadata across multiple data directories
> ------------------------------------------------
>
> Key: KUDU-2117
> URL: https://issues.apache.org/jira/browse/KUDU-2117
> Project: Kudu
> Issue Type: Bug
> Components: fs, tablet, tserver
> Affects Versions: 1.6.0
> Reporter: Andrew Wong
> Assignee: Andrew Wong
> Fix For: 1.6.0
>
>
> Tablet metadata and consensus metadata are placed in the first configured
> data directory. This is an issue, as every write to these metadata incurs an
> fsync and this stresses the first disk considerably more than the others
> One way around this is to spread metadata across multiple data directories. A
> natural choice would be to place them in a directory within the tablet's disk
> group. In this way, the data/metadata can be completely localized to the disk
> group, which has the added benefit of making the risk of disk failures easier
> to assess per tablet.
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