[jira] [Updated] (HADOOP-9565) Add a Blobstore interface to add to blobstore FileSystems

["Thomas Demoor (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-9565?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thomas Demoor updated HADOOP-9565:
----------------------------------
    Attachment: HADOOP-9565-004.patch

004 introduces an objectStore-aware FileOutputCommitter: it writes directly to the outputPath if in-progress/failed writes are not visible on the object store.

[~jnp], [~anu], [~cnauroth] and [~jghoman]: this is the approach I think HDFS-7240 can easily use this to avoid the "rename issue".

The implementation optios were constrained by the fact that FileOutputCommitter has a stable public interface:
* implementing the changes by subclassing was not possible
* the public / protected methods could not be changed. Often they are also static (for use in MR1), further limiting options.

Some smaller stylistic changes (checkstyle, etc.) to the code in 003.patch

> Add a Blobstore interface to add to blobstore FileSystems
> ---------------------------------------------------------
>
>                 Key: HADOOP-9565
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9565
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs, fs/s3, fs/swift
>    Affects Versions: 2.6.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>              Labels: BB2015-05-TBR
>         Attachments: HADOOP-9565-001.patch, HADOOP-9565-002.patch, HADOOP-9565-003.patch, HADOOP-9565-004.patch
>
>
> We can make the fact that some {{FileSystem}} implementations are really blobstores, with different atomicity and consistency guarantees, by adding a {{Blobstore}} interface to add to them. 
> This could also be a place to add a {{Copy(Path,Path)}} method, assuming that all blobstores implement at server-side copy operation as a substitute for rename.



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