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Posted to common-dev@hadoop.apache.org by "Luke Lu (JIRA)" <ji...@apache.org> on 2009/01/17 00:49:59 UTC
[jira] Commented: (HADOOP-4379) In HDFS, sync() not yet guarantees
data available to the new readers
[ https://issues.apache.org/jira/browse/HADOOP-4379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12664739#action_12664739 ]
Luke Lu commented on HADOOP-4379:
---------------------------------
If TC3 is too hard in general. A TC2.5, like be able to open the file on the same machine to see the half block (after the fsync) would be nice. It would go a long way to make the transaction log work and make things restartable.
> In HDFS, sync() not yet guarantees data available to the new readers
> --------------------------------------------------------------------
>
> Key: HADOOP-4379
> URL: https://issues.apache.org/jira/browse/HADOOP-4379
> Project: Hadoop Core
> Issue Type: New Feature
> Components: dfs
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: dhruba borthakur
> Fix For: 0.19.1
>
> Attachments: 4379_20081010TC3.java, fsyncConcurrentReaders.txt
>
>
> In the append design doc (https://issues.apache.org/jira/secure/attachment/12370562/Appends.doc), it says
> * A reader is guaranteed to be able to read data that was 'flushed' before the reader opened the file
> However, this feature is not yet implemented. Note that the operation 'flushed' is now called "sync".
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