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From "Carlos Valiente (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4707) Improvements to Hadoop Thrift bindings
Date Fri, 21 Nov 2008 21:35:44 GMT
Improvements to Hadoop Thrift bindings
--------------------------------------

                 Key: HADOOP-4707
                 URL: https://issues.apache.org/jira/browse/HADOOP-4707
             Project: Hadoop Core
          Issue Type: Improvement
          Components: contrib/thiftfs
    Affects Versions: 0.20.0
         Environment: Tested under Linux x86-64
            Reporter: Carlos Valiente
            Priority: Minor
             Fix For: 0.20.0
         Attachments: hadoopfs_thrift.diff

I have made the following changes to hadoopfs.thrift:

#  Added namespaces for Python, Perl and C++.

# Renamed parameters and struct members to camelCase versions to keep them consistent (in
particular FileStatus{blockReplication,blockSize} vs FileStatus.{block_replication,blocksize}).

# Renamed ThriftHadoopFileSystem to FileSystem. From the perspective of a Perl/Python/C++
user, 1) it is already clear that we're using Thrift, and 2) the fact that we're dealing with
Hadoop is already explicit in the namespace.  The usage of generated code is more compact
and (in my opinion) clearer:
{quote}
        *Perl*:
        use HadoopFS;

        my $client = HadoopFS::FileSystemClient->new(..);

         _instead of:_

        my $client = HadoopFS::ThriftHadoopFileSystemClient->new(..);

        *Python*:

        from hadoopfs import FileSystem

        client = FileSystem.Client(..)

        _instead of_

        from hadoopfs import ThriftHadoopFileSystem

        client = ThriftHadoopFileSystem.Client(..)

        (See also the attached diff [^scripts_hdfs_py.diff] for the
         new version of 'scripts/hdfs.py').

        *C++*:

        hadoopfs::FileSystemClient client(..);

         _instead of_:

        hadoopfs::ThriftHadoopFileSystemClient client(..);
{quote}

# Renamed ThriftHandle to FileHandle: As in 3, it is clear that we're dealing with a Thrift
object, and its purpose (to act as a handle for file operations) is clearer.

# Renamed ThriftIOException to IOException, to keep it simpler, and consistent with MalformedInputException.

# Added explicit version tags to fields of ThriftHandle/FileHandle, Pathname, MalformedInputException
and ThriftIOException/IOException, to improve compatibility of existing clients with future
versions of the interface which might add new fields to those objects (like stack traces for
the exception types, for instance).

Those changes are reflected in the attachment [^hadoopfs_thrift.diff].

Changes in generated Java, Python, Perl and C++ code are also attached in [^gen.diff]. They
were generated by a Thrift checkout from trunk
([http://svn.apache.org/repos/asf/incubator/thrift/trunk/]) as of revision
719697, plus the following Perl-related patches:

* [https://issues.apache.org/jira/browse/THRIFT-190]
* [https://issues.apache.org/jira/browse/THRIFT-193]
* [https://issues.apache.org/jira/browse/THRIFT-199]

The Thrift jar file [^libthrift.jar] built from that Thrift checkout is also attached, since
it's needed to run the Java Thrift server.

I have also added a new target to src/contrib/thriftfs/build.xml to build the Java bindings
needed for org.apache.hadoop.thriftfs.HadoopThriftServer.java (see attachment [^build_xml.diff]
and modified HadoopThriftServer.java to make use of the new bindings (see attachment [^HadoopThriftServer_java.diff]).

The jar file [^lib/hadoopthriftapi.jar] is also included, although it can be regenerated from
the stuff under 'gen-java' and the new 'compile-gen' Ant target.

The whole changeset is also included as [^all.diff].

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