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From "Prakash Khemani (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5618) SplitLogManager - prevent unnecessary attempts to resubmits
Date Tue, 03 Apr 2012 21:52:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13245790#comment-13245790

Prakash Khemani commented on HBASE-5618:

sorry for the test failure. fixed and verified.
> SplitLogManager - prevent unnecessary attempts to resubmits
> -----------------------------------------------------------
>                 Key: HBASE-5618
>                 URL: https://issues.apache.org/jira/browse/HBASE-5618
>             Project: HBase
>          Issue Type: Improvement
>          Components: wal, zookeeper
>            Reporter: Prakash Khemani
>            Assignee: Prakash Khemani
>         Attachments: 0001-HBASE-5618-SplitLogManager-prevent-unnecessary-attem.patch,
> Currently once a watch fires that the task node has been updated (hearbeated) by the
worker, the splitlogmanager still quite some time before it updates the "last heard from"
time. This is because the manager currently schedules another getDataSetWatch() and only after
that finishes will it update the task's "last heard from" time.
> This leads to a large number of zk-BadVersion warnings when resubmission is continuously
attempted and it fails.
> Two changes should be made
> (1) On a resubmission failure because of BadVersion the task's lastUpdate time should
get upped.
> (2) The task's lastUpdate time should get upped as soon as the nodeDataChanged() watch
fires and without waiting for getDataSetWatch() to complete.

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