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From "Bob Hansen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10672) libhdfs++: reorder directories in src/main/libhdfspp/examples, and add C++ version of cat tool
Date Fri, 29 Jul 2016 11:28:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15399164#comment-15399164
] 

Bob Hansen commented on HDFS-10672:
-----------------------------------

This is a better arrangement than what was in before, [~anatoli.shein].  Thanks.

In the C++ cat:
* The last_bytes_read parameter should be set to sizeof(buf) each time.  That makes this a
very messy and error-prone API; buf_size and bytes_read should be different parameters.  Let's
fix it as part of this bug.
* We need to fix ownership issues with the IOService.  Filed HDFS-10704 to capture that.
* We should have a no-args FileSystem::New.  Filed HDFS-10705 to capture that.
* We should distinguish between normal end-of-file failures to read and "there was an error"
status.  What should we expect when we get to EOF?  We should document that in the headers.

When the C cat was originally written, we didn't have configuration parsing in libhdfs++.
 Now that we do, should we get rid of the URI stuff in the cat examples and just check that
they have a properly configured config directory (with a nice message with how to set HADOOP_CONF_DIR
if they don't)?  I think it will make this example much simpler and cleaner, if less useful
(let's put the useful one in the utility app).


> libhdfs++: reorder directories in src/main/libhdfspp/examples, and add C++ version of
cat tool
> ----------------------------------------------------------------------------------------------
>
>                 Key: HDFS-10672
>                 URL: https://issues.apache.org/jira/browse/HDFS-10672
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: Anatoli Shein
>            Assignee: Anatoli Shein
>         Attachments: HDFS-10672.HDFS-8707.000.patch, HDFS-10672.HDFS-8707.001.patch
>
>
> src/main/libhdfspp/examples should be structured like examples/language/utility instead
of examples/utility/language for easier access by different developers.
> Additionally implementing C++ version of cat tool.



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