[jira] [Created] (KUDU-1950) TS runs out of FDs for WALs when running many tablets

["David Alves (JIRA)" <ji...@apache.org>]

David Alves created KUDU-1950:
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             Summary: TS runs out of FDs for WALs when running many tablets
                 Key: KUDU-1950
                 URL: https://issues.apache.org/jira/browse/KUDU-1950
             Project: Kudu
          Issue Type: Improvement
          Components: consensus, fs, tserver
    Affects Versions: 1.2.0
            Reporter: David Alves


A user was recently complaining that his TS ran out of FDs when he had many tablets and that most were being used by WALs.

While this was a bit of a non-usual setup - a lot of un-replicated tablets on a single TS - we're likely to hit this problem as we increase density and try and have many more tablets per tablet server.

The report was that each tablet would use 3 fd's for the WAL. Ultimately we'll likely need some solution akin to the what we've done for the FBM/LBM regarding having an LRU cache of fds for the WAL too.




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