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Posted to common-dev@hadoop.apache.org by "stack (JIRA)" <ji...@apache.org> on 2007/09/15 05:33:32 UTC
[jira] Updated: (HADOOP-1903) [hbase] Possible data loss if
Exception happens between snapshot and flush to disk.
[ https://issues.apache.org/jira/browse/HADOOP-1903?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
stack updated HADOOP-1903:
--------------------------
Assignee: stack
Priority: Minor (was: Major)
Summary: [hbase] Possible data loss if Exception happens between snapshot and flush to disk. (was: [hbase] Data loss if Exception happens between snapshot and flush to disk.)
> [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
> Reporter: stack
> Assignee: stack
> Priority: Minor
>
> 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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