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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4707) Improvements to Hadoop Thrift bindings
Date Fri, 17 Apr 2009 21:42:15 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4707?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HADOOP-4707:
--------------------------------

    Attachment: HADOOP-4707-55c046a.txt

Attached is a patch with some further improvements:
* datenodeUp/datanodeDown now take a storage ID, and the thriftPorts maps from DatanodeID
instances to ints
* Uses thrift enums now for DatanodeReportType and DatanodeState
* Reran thrift with newest trunk thrift for all languages (looked like some languages hadn't
been re-run recently)
* Depends on HADOOP-5640 for:
** Restarting the namenode while DN is still up now properly triggers datanodeUp messages
from DNs after they've re-registered at the NN
* Few misc fixes:
** DatanodePlugin 'register' member is now volatile since it's accessed by multiple threads
without synchronization
** typo: THRFIT -> THRIFT
** PluginBase has been refactored to a containment relationship instead of a subclassing relationship,
so hence renamed to ThriftPluginServer
** When connecting to the NN thrift service, if it's configured as 0.0.0.0, use NameNode.getAddress
to figure out what the external IP it's actually listening on is.


> 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: Carlos Valiente
>            Priority: Minor
>         Attachments: all.diff, BlockManager.java, build_xml.diff, DefaultBlockManager.java,
DFSBlockManager.java, gen.diff, HADOOP-4707-55c046a.txt, 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
>
>
> 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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