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Date: Sat, 6 Jun 2009 00:20:07 -0700 (PDT)
From: "dhruba borthakur (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-4707) Improvements to Hadoop Thrift
 bindings
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    [ https://issues.apache.org/jira/browse/HADOOP-4707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12716845#action_12716845 ] 

dhruba borthakur commented on HADOOP-4707:
------------------------------------------

Thsi patch allows the hdfs-thrift server to run inside the NN. This is a good thing. However, some administrators might like to keep running the hdfs-thrift server separately from the namenode (as it currently stands in trunk)... the reason being that the NN is already a big memory hog and allowing the hdfs-thrift server to share the same address space could introduce new resource bottlenecks in the NN that could impact the whole cluster stability. Do you agree?

> 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
>            Assignee: Todd Lipcon
>            Priority: Minor
>         Attachments: all.diff, BlockManager.java, build_xml.diff, DefaultBlockManager.java, DFSBlockManager.java, gen.diff, hadoop-4707-31c331.patch.gz, HADOOP-4707-55c046a.txt, hadoop-4707-6bc958.txt, hadoop-4707-867f26.txt.gz, HADOOP-4707.diff, HADOOP-4707.patch, HADOOP-4707.patch, hadoopfs_thrift.diff, hadoopthriftapi.jar, HadoopThriftServer.java, HadoopThriftServer_java.diff, hdfs.py, hdfs_py_venky.diff, libthrift.jar, libthrift.jar, libthrift.jar, libthrift.jar
>
>
> 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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