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Date: Mon, 21 Aug 2017 11:45:00 +0000 (UTC)
From: "Steve Loughran (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-14402) roll out StreamCapabilities
 across output streams of all filesystems
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archived-at: Mon, 21 Aug 2017 11:45:07 -0000


    [ https://issues.apache.org/jira/browse/HADOOP-14402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16135064#comment-16135064 ] 

Steve Loughran commented on HADOOP-14402:
-----------------------------------------

+I'm not doing anything about declaring new capabilities, not here

> roll out StreamCapabilities across output streams of all filesystems
> --------------------------------------------------------------------
>
>                 Key: HADOOP-14402
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14402
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs, fs/adl, fs/azure, fs/oss, fs/s3, fs/swift
>    Affects Versions: 3.0.0-alpha4
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>
> HDFS-11644 added a way to probe streams for capabilities, with dfsoutput stream implementing some. 
> We should roll this out to all our output streams, with capabilities to define
> * is metadata in sync with flushed data (HDFS: no)
> * does LocalFileSystem really do a sync/flush (as I don't think any subclass of ChecksumFS does, so {{FSOutputSummer}} should declare this in its capabilities
> * are intermediate writes visible *at all*? 
> * Is close() potentially a long operation (for object stores, yes, on a case-by-case basis)
> We'll need useful names for these options, obviously, tests, etc etc


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