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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2013/01/10 19:10:13 UTC

[jira] [Updated] (HBASE-4274) RS should periodically ping its HLog pipeline even if no writes are arriving

     [ https://issues.apache.org/jira/browse/HBASE-4274?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack updated HBASE-4274:
-------------------------

         Priority: Major  (was: Critical)
    Fix Version/s:     (was: 0.96.0)

Marking down to major and moving out of 0.96.  Bring back in if folks want RS to die quickly when HDFS goes out from under HBase (It does seem like general tendency though is to go the other direction, and try and ride over an HDFS outage if possible).
                
> RS should periodically ping its HLog pipeline even if no writes are arriving
> ----------------------------------------------------------------------------
>
>                 Key: HBASE-4274
>                 URL: https://issues.apache.org/jira/browse/HBASE-4274
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver, wal
>    Affects Versions: 0.92.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>
> If you restart HDFS underneath HBase, when HBase isn't taking any write load, the region servers won't "notice" that there's any problem until the next time they take a write, at which point they will abort (because the pipeline is gone from beneath them). It would be better if they wrote some garbage to their HLog once every few seconds as a sort of keepalive, so they will aggressively abort as soon as there's an issue.

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