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From "Sean Busbey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11644) Support for querying outputstream capabilities
Date Thu, 03 Aug 2017 21:00:06 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16113479#comment-16113479
] 

Sean Busbey commented on HDFS-11644:
------------------------------------

{quote}
In the meantime, I have a question for hbase. As StreamCapabilities is bind to an OutputStream,
Hbase needs to firstly open a file for write (i.e., getting the output stream, before it can
query the capabilities. Would this satisfy the needs from hbase side?
{quote}

Yeah that's fine I think. I'll come complain if implementing use of it makes me change my
mind. ;)

> 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: 2.9.0, 3.0.0-alpha4
>
>         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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