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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 Fri, 26 May 2017 17:20:04 GMT

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

Chris Douglas updated HDFS-6984:
--------------------------------
    Release Note: FileStatus and FsPermission Writable serialization is deprecated and its
implementation (incompatibly) replaced with protocol buffers. The FsPermissionProto record
moved from hdfs.proto to acl.proto. HdfsFileStatus is now a subtype of FileStatus. FsPermissionExtension
with its associated flags for ACLs, encryption, and erasure coding has been deprecated; users
should query these attributes on the FileStatus object directly.

> 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-6984.011.patch, HDFS-6984.012.patch, HDFS-6984.013.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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