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Posted to issues@hbase.apache.org by "Andrew Purtell (JIRA)" <ji...@apache.org> on 2011/08/29 10:31:37 UTC

[jira] [Commented] (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:comment-tabpanel&focusedCommentId=13092698#comment-13092698 ] 

Andrew Purtell commented on HBASE-4274:
---------------------------------------

Doesn't HBASE-4222 already address this? It takes a different approach, and arguably a better one. No need to abort if a new HLog pipeline can be established.

> 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
>            Priority: Critical
>             Fix For: 0.92.0
>
>
> 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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