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https://issues.apache.org/jira/browse/HDFS-11644?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Wang reopened HDFS-11644:
--------------------------------

> Support for querying outputstream capabilities
> ----------------------------------------------
>
>                 Key: HDFS-11644
>                 URL: https://issues.apache.org/jira/browse/HDFS-11644
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: erasure-coding
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Andrew Wang
>            Assignee: Manoj Govindassamy
>              Labels: hdfs-ec-3.0-must-do
>             Fix For: 3.0.0-alpha3
>
>         Attachments: HDFS-11644.01.patch, HDFS-11644.02.patch, 
> HDFS-11644.03.patch, HDFS-11644-branch-2.01.patch
>
>
> FSDataOutputStream#hsync checks if a stream implements Syncable, and if so, 
> calls hsync. Otherwise, it just calls flush. This is used, for instance, by 
> YARN's FileSystemTimelineWriter.
> DFSStripedOutputStream extends DFSOutputStream, which implements Syncable. 
> However, DFSStripedOS throws a runtime exception when the Syncable methods 
> are called.
> We should refactor the inheritance structure so DFSStripedOS does not 
> implement Syncable.



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