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Posted to issues@kudu.apache.org by "Andrew Wong (JIRA)" <ji...@apache.org> on 2017/08/28 18:08:00 UTC

[jira] [Created] (KUDU-2117) Spread metadata across multiple data directories

Andrew Wong created KUDU-2117:
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             Summary: 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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