[jira] [Created] (KUDU-2359) tserver should allow starting with a small number of missing data dirs

["Todd Lipcon (JIRA)" <ji...@apache.org>]

Todd Lipcon created KUDU-2359:
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             Summary: tserver should allow starting with a small number of missing data dirs
                 Key: KUDU-2359
                 URL: https://issues.apache.org/jira/browse/KUDU-2359
             Project: Kudu
          Issue Type: Improvement
          Components: fs, tserver
            Reporter: Todd Lipcon


Often when a disk fails, its mount point will not come back up when the server is restarted. Currently, Kudu will respond to this by failing to restart with an error like:
F0314 18:23:39.353916 112051 tablet_server_main.cc:80] Check failed: _s.ok() Bad status: Already present: FS layout already exists; not overwriting existing layout. See https://kudu.apache.org/releases/1.8.0-SNAPSHOT/docs/troubleshooting.html: unable to create file system roots: FSManager roots already exist: /data/1/kudu,/data/2/kudu,/data/3/kudu,/data/5/kudu,/data/6/kudu,/data/7/kudu,/data/8/kudu,/data/1/kudu-wal

However, this defeats some of the advantages of the "allow single disk failure" work. One could use the update_data_dirs tool to remove the missing disk, but you'd also need to persistently change the configuration of the daemon, which is hard to do with a consistent configuration management.



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