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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2657) Enhancements to DFSClient to support flushing data at any point in time
Date Fri, 07 Mar 2008 01:14:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12575999#action_12575999
] 

Raghu Angadi commented on HADOOP-2657:
--------------------------------------

with flush5.patch : Not sure if we need lines 2312 through 2334 in DFSClient.java. i.e. every
thing seems to be ok even if we just delete them.

> Enhancements to DFSClient to support flushing data at any point in time
> -----------------------------------------------------------------------
>
>                 Key: HADOOP-2657
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2657
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: flush.patch, flush2.patch, flush3.patch, flush4.patch, flush5.patch
>
>
> The HDFS Append Design (HADOOP-1700) requires that there be a public API to flush data
written to a HDFS file that can be invoked by an application. This API (popularly referred
to a fflush(OutputStream)) will ensure that data written to the DFSOutputStream is flushed
to datanodes and any required metadata is persisted on Namenode.
> This API has to handle the case when the client decides to flush after writing data that
is not a exact multiple of io.bytes.per.checksum.

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