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https://issues.apache.org/jira/browse/HADOOP-2657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12576059#action_12576059
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dhruba borthakur commented on HADOOP-2657:
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Maybe you missed the "return" at the end of that code block. This block avoids
calling flushInternal if no new data has been written since the last flush
call. Am I missing something?
> 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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