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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
Date Tue, 09 May 2017 06:56:04 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Douglas updated HDFS-6984:
--------------------------------
    Attachment: HDFS-6984.010.patch

No worries; thanks for the thorough review, Andrew.

I'll run this through Jenkins again, fix up snapshots, and we can finish this.

> In Hadoop 3, make FileStatus serialize itself via protobuf
> ----------------------------------------------------------
>
>                 Key: HDFS-6984
>                 URL: https://issues.apache.org/jira/browse/HDFS-6984
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Colin P. McCabe
>            Assignee: Colin P. McCabe
>              Labels: BB2015-05-TBR
>         Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch, HDFS-6984.003.patch, HDFS-6984.004.patch,
HDFS-6984.005.patch, HDFS-6984.006.patch, HDFS-6984.007.patch, HDFS-6984.008.patch, HDFS-6984.009.patch,
HDFS-6984.010.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier.  Originally, we used this to serialize
it and send it over the wire.  But in Hadoop 2 and later, we have the protobuf {{HdfsFileStatusProto}}
which serves to serialize this information.  The protobuf form is preferable, since it allows
us to add new fields in a backwards-compatible way.  Another issue is that already a lot of
subclasses of FileStatus don't override the Writable methods of the superclass, breaking the
interface contract that read(status.write) should be equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so that we
don't have to deal with these issues.  It's probably too late to do this in Hadoop 2, since
user code may be relying on the existing FileStatus serialization there.



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