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From "Prakash Khemani (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-5618) SplitLogManager - prevent unnecessary attempts to resubmits
Date Mon, 26 Mar 2012 21:50:29 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Prakash Khemani updated HBASE-5618:

    Attachment: 0001-HBASE-5618-SplitLogManager-prevent-unnecessary-attem.patch

update "heartbeat time" as soon as possible and as often as one can.
> 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
>         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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