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https://issues.apache.org/jira/browse/HDFS-11644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16002411#comment-16002411
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Steve Loughran commented on HDFS-11644:
---------------------------------------
yeah, looks good to me.
I'm going to try and submit my PoC for something related to this for
HADOOP-9565; again string based, though I'm thinking of explicitly returning
{{Option<Boolean>}} to allow the call to return yes, no and "don't know". The
current proto just reuses all the XML /contract/*/xml files used in testing the
FS contracts so that we can reuse that list of FS behaviours
> 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
>
>
> 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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