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https://issues.apache.org/jira/browse/HDFS-5868?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Buddy updated HDFS-5868:
------------------------

    Attachment: HDFS-5868-branch-2.patch

> Make hsync implementation pluggable
> -----------------------------------
>
>                 Key: HDFS-5868
>                 URL: https://issues.apache.org/jira/browse/HDFS-5868
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 2.2.0
>            Reporter: Buddy
>         Attachments: HDFS-5868-branch-2.patch
>
>
> The current implementation of hsync in BlockReceiver only works if the output 
> streams are instances of FileOutputStream. Therefore, there is currently no 
> way for a FSDatasetSpi plugin to implement hsync if it is not using standard 
> OS files.
> One possible solution is to push the implementation of hsync into the 
> ReplicaOutputStreams class. This class is constructed by the 
> ReplicaInPipeline which is constructed by the FSDatasetSpi plugin, therefore 
> it can be extended. Instead of directly calling sync on the output stream, 
> BlockReceiver would call ReplicaOutputStream.sync.  The default 
> implementation of sync in ReplicaOutputStream would be the same as the 
> current implementation in BlockReceiver. 



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