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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1903) [hbase] Possible data loss if Exception happens between snapshot and flush to disk.
Date Sun, 16 Sep 2007 12:13:32 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12527858
] 

Hudson commented on HADOOP-1903:
--------------------------------

Integrated in Hadoop-Nightly #239 (See [http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Nightly/239/])

> [hbase] Possible data loss if Exception happens between snapshot and flush to disk.
> -----------------------------------------------------------------------------------
>
>                 Key: HADOOP-1903
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1903
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/hbase
>            Reporter: stack
>            Assignee: stack
>            Priority: Minor
>             Fix For: 0.15.0
>
>         Attachments: 1903.patch
>
>
> There exists a little window during which we can lose data.  During a memcache flush,
we make an inmemory copy, a 'snapshot'.  The memcache is then zeroed and off we go again taking
updates.  Meantime, in background we are supposed to flush the snapshot to disk.  If this
process is interrupted -- e.g. the HDFS is yanked from under us or if an OOME occurs in this
thread -- then the content of the snapshot is lost.

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