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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4356) BlockReaderLocal should use passed file descriptors rather than paths
Date Thu, 03 Jan 2013 22:24:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13543352#comment-13543352
] 

Colin Patrick McCabe commented on HDFS-4356:
--------------------------------------------

This is the final subtask of HDFS-347.  It modifies {{BlockReaderLocal}} and {{DataXceiver}}
to use the domain socket abstractions.  It adds {{OpRequestShortCircuitAccessProto}} to {{hadoop-hdfs-project/hadoop-hdfs/src/main/proto/datatransfer.proto}}.

BlockReader gets a new method, {{available}}, which is used to determine how much data is
probably available from the {{BlockReader}} without performing network I/O.  It's a heuristic.
 This replaces a hard-coded check against TCP_WINDOW_SIZE in {{DFSClient.java}}.

{{DomainSocketFactory}} is a new class which manages creating UNIX domain sockets.  This includes
managing the blacklists of non-working domain sockets and tracking whether UNIX domain sockets
are configured and available.

The tests which inherit from {{TestParallelReadUtil}} now rely on the {{\@Test}} functions
declared in the superclass, rather than duplicating that code.  There are also a few new derived
classes like {{TestParallelUnixDomainRead}} and {{TestParallelShortCircuitReadNoChecksum}}.
                
> BlockReaderLocal should use passed file descriptors rather than paths
> ---------------------------------------------------------------------
>
>                 Key: HDFS-4356
>                 URL: https://issues.apache.org/jira/browse/HDFS-4356
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, hdfs-client, performance
>    Affects Versions: 2.0.3-alpha
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: 04-cumulative.patch
>
>
> {{BlockReaderLocal}} should use file descriptors passed over UNIX domain sockets rather
than paths.  We also need some configuration options for these UNIX domain sockets.

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