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Distcp should have forrest documentation
----------------------------------------

Key: HADOOP-2984
URL: https://issues.apache.org/jira/browse/HADOOP-2984
Project: Hadoop Core
Issue Type: Task
Components: util
Reporter: Owen O'Malley


We really should have a page on how to use distcp.

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  • Robert Chansler (JIRA) at Jun 9, 2008 at 5:32 pm
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

    Robert Chansler updated HADOOP-2984:
    ------------------------------------

    Priority: Blocker (was: Major)
    Fix Version/s: 0.18.0
    Assignee: Chris Douglas
    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0


    We really should have a page on how to use distcp.
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  • Chris Douglas (JIRA) at Jun 10, 2008 at 3:46 am
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

    Chris Douglas updated HADOOP-2984:
    ----------------------------------

    Attachment: 2984-0.patch

    First draft
    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch


    We really should have a page on how to use distcp.
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  • Chris Douglas (JIRA) at Jun 10, 2008 at 3:48 am
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

    Chris Douglas updated HADOOP-2984:
    ----------------------------------

    Status: Patch Available (was: Open)
    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch


    We really should have a page on how to use distcp.
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  • Chris Douglas (JIRA) at Jun 10, 2008 at 3:50 am
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

    Chris Douglas updated HADOOP-2984:
    ----------------------------------

    Attachment: 2984-0.patch
    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch


    We really should have a page on how to use distcp.
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  • Chris Douglas (JIRA) at Jun 10, 2008 at 3:50 am
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

    Chris Douglas updated HADOOP-2984:
    ----------------------------------

    Attachment: (was: 2984-0.patch)
    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch


    We really should have a page on how to use distcp.
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  • Hadoop QA (JIRA) at Jun 10, 2008 at 5:20 am
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12603775#action_12603775 ]

    Hadoop QA commented on HADOOP-2984:
    -----------------------------------

    -1 overall. Here are the results of testing the latest attachment
    http://issues.apache.org/jira/secure/attachment/12383727/2984-0.patch
    against trunk revision 665937.

    +1 @author. The patch does not contain any @author tags.

    -1 tests included. The patch doesn't appear to include any new or modified tests.
    Please justify why no tests are needed for this patch.

    +1 javadoc. The javadoc tool did not generate any warning messages.

    +1 javac. The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs. The patch does not introduce any new Findbugs warnings.

    -1 release audit. The applied patch generated 203 release audit warnings (more than the trunk's current 201 warnings).

    +1 core tests. The patch passed core unit tests.

    +1 contrib tests. The patch passed contrib unit tests.

    Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2627/testReport/
    Release audit warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2627/artifact/trunk/current/releaseAuditDiffWarnings.txt
    Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2627/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
    Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2627/artifact/trunk/build/test/checkstyle-errors.html
    Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2627/console

    This message is automatically generated.
    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch


    We really should have a page on how to use distcp.
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  • Chris Douglas (JIRA) at Jun 10, 2008 at 6:40 pm
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

    Chris Douglas updated HADOOP-2984:
    ----------------------------------

    Attachment: 2984-1.patch

    Looks like I picked up an earlier draft without the license; trying again.
    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch, 2984-1.patch


    We really should have a page on how to use distcp.
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  • Chris Douglas (JIRA) at Jun 10, 2008 at 6:42 pm
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

    Chris Douglas updated HADOOP-2984:
    ----------------------------------

    Status: Patch Available (was: Open)
    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch, 2984-1.patch


    We really should have a page on how to use distcp.
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  • Chris Douglas (JIRA) at Jun 10, 2008 at 6:42 pm
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12603970#action_12603970 ]

    chris.douglas edited comment on HADOOP-2984 at 6/10/08 11:40 AM:
    -----------------------------------------------------------------

    I changed the name of the file, and might have missed the license somehow... trying again.

    was (Author: chris.douglas):
    Looks like I picked up an earlier draft without the license; trying again.
    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch, 2984-1.patch


    We really should have a page on how to use distcp.
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  • Chris Douglas (JIRA) at Jun 10, 2008 at 6:42 pm
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

    Chris Douglas updated HADOOP-2984:
    ----------------------------------

    Status: Open (was: Patch Available)
    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch, 2984-1.patch


    We really should have a page on how to use distcp.
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  • Hadoop QA (JIRA) at Jun 10, 2008 at 8:16 pm
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12604016#action_12604016 ]

    Hadoop QA commented on HADOOP-2984:
    -----------------------------------

    -1 overall. Here are the results of testing the latest attachment
    http://issues.apache.org/jira/secure/attachment/12383764/2984-1.patch
    against trunk revision 666056.

    +1 @author. The patch does not contain any @author tags.

    -1 tests included. The patch doesn't appear to include any new or modified tests.
    Please justify why no tests are needed for this patch.

    +1 javadoc. The javadoc tool did not generate any warning messages.

    +1 javac. The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs. The patch does not introduce any new Findbugs warnings.

    -1 release audit. The applied patch generated 202 release audit warnings (more than the trunk's current 201 warnings).

    +1 core tests. The patch passed core unit tests.

    +1 contrib tests. The patch passed contrib unit tests.

    Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2632/testReport/
    Release audit warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2632/artifact/trunk/current/releaseAuditDiffWarnings.txt
    Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2632/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
    Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2632/artifact/trunk/build/test/checkstyle-errors.html
    Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2632/console

    This message is automatically generated.
    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch, 2984-1.patch


    We really should have a page on how to use distcp.
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  • Tsz Wo (Nicholas), SZE (JIRA) at Jun 11, 2008 at 10:31 pm
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12604367#action_12604367 ]

    Tsz Wo (Nicholas), SZE commented on HADOOP-2984:
    ------------------------------------------------

    - Provide the full class name for DispCp once in the beginning for the document.

    - Add a line to explain the command name distcp

    - Some examples have long single line commands. These long single line commands got wrapped up in the docoument, especially in the pdf. It is good to use \ to break the long command into several lines. e.g.
    Use
    {noformat}
    hadoop distcp \
    hdfs://nn1:8020/foo/a \
    hdfs://nn1:8020/foo/b \
    hdfs://nn2:8020/bar/foo
    {noformat}
    instead of
    {noformat}
    hadoop distcp hdfs://nn1:8020/foo/a hdfs://nn1:8020/foo/b hdfs://nn2:8020/bar/foo
    {noformat}

    - I think it is more clear to add a command prompt for shell commands
    e.g.
    {noformat}
    bash$ hadoop distcp ...
    {noformat}

    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch, 2984-1.patch


    We really should have a page on how to use distcp.
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  • Tsz Wo (Nicholas), SZE (JIRA) at Jun 11, 2008 at 10:51 pm
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12604367#action_12604367 ]

    szetszwo edited comment on HADOOP-2984 at 6/11/08 3:49 PM:
    -------------------------------------------------------------------------

    - Provide the full class name of DispCp in the beginning of the document.

    - Add a line to explain the name distcp

    - Some examples have long-single-line-commands. These long-single-line-commands got wrapped up in the document, especially in the pdf. It is good to use \ to break the long command into several lines. e.g.
    Use
    {noformat}
    hadoop distcp \
    hdfs://nn1:8020/foo/a \
    hdfs://nn1:8020/foo/b \
    hdfs://nn2:8020/bar/foo
    {noformat}
    instead of
    {noformat}
    hadoop distcp hdfs://nn1:8020/foo/a hdfs://nn1:8020/foo/b hdfs://nn2:8020/bar/foo
    {noformat}

    - I think it is more clear to add a command prompt for shell commands
    e.g.
    {noformat}
    bash$ hadoop distcp ...
    {noformat}


    was (Author: szetszwo):
    - Provide the full class name for DispCp once in the beginning for the document.

    - Add a line to explain the command name distcp

    - Some examples have long single line commands. These long single line commands got wrapped up in the docoument, especially in the pdf. It is good to use \ to break the long command into several lines. e.g.
    Use
    {noformat}
    hadoop distcp \
    hdfs://nn1:8020/foo/a \
    hdfs://nn1:8020/foo/b \
    hdfs://nn2:8020/bar/foo
    {noformat}
    instead of
    {noformat}
    hadoop distcp hdfs://nn1:8020/foo/a hdfs://nn1:8020/foo/b hdfs://nn2:8020/bar/foo
    {noformat}

    - I think it is more clear to add a command prompt for shell commands
    e.g.
    {noformat}
    bash$ hadoop distcp ...
    {noformat}

    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch, 2984-1.patch


    We really should have a page on how to use distcp.
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  • Tsz Wo (Nicholas), SZE (JIRA) at Jun 11, 2008 at 11:15 pm
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12604374#action_12604374 ]

    Tsz Wo (Nicholas), SZE commented on HADOOP-2984:
    ------------------------------------------------

    BTW, there are some unrelated changes of docs/hadoop-default.html in the patch.
    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch, 2984-1.patch


    We really should have a page on how to use distcp.
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  • Chris Douglas (JIRA) at Jun 13, 2008 at 8:42 pm
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

    Chris Douglas updated HADOOP-2984:
    ----------------------------------

    Attachment: 2984-2.patch

    bq. Provide the full class name of DispCp in the beginning of the document.

    Since this is a guide to users of distcp and not developers, I left this out.

    bq. Add a line to explain the name distcp
    bq. Some examples have long-single-line-commands. These long-single-line-commands got wrapped up in the document, especially in the pdf. It is good to use \ to break the long command into several lines
    bq. I think it is more clear to add a command prompt for shell commands

    Good ideas; done.

    Thanks for the review
    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch, 2984-1.patch, 2984-2.patch


    We really should have a page on how to use distcp.
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  • Koji Noguchi (JIRA) at Jun 13, 2008 at 11:02 pm
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12605001#action_12605001 ]

    Koji Noguchi commented on HADOOP-2984:
    --------------------------------------

    +1.

    bq. It's also worth noting that if another client is still writing to a source file, the copy will likely fail.

    Maybe also mention,
    * if any source files are deleted after distcp has started, mappers would fail (with file not found).
    * If speculative execution is turned on as 'final', behavior of distcp is undefined.

    bq. It's worth giving some examples of -update and -overwrite.

    I always had trouble with these options.
    Could you show how the target directory structures look like after the distcp?
    (with and without -update/overwrite option)



    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch, 2984-1.patch, 2984-2.patch


    We really should have a page on how to use distcp.
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  • Chris Douglas (JIRA) at Jun 13, 2008 at 11:52 pm
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

    Chris Douglas updated HADOOP-2984:
    ----------------------------------

    Attachment: 2984-3.patch

    Incorporated Koji's feedback
    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch, 2984-1.patch, 2984-2.patch, 2984-3.patch


    We really should have a page on how to use distcp.
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  • Chris Douglas (JIRA) at Jun 14, 2008 at 12:40 am
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

    Chris Douglas updated HADOOP-2984:
    ----------------------------------

    Resolution: Fixed
    Hadoop Flags: [Reviewed]
    Status: Resolved (was: Patch Available)

    I just committed this.
    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch, 2984-1.patch, 2984-2.patch, 2984-3.patch


    We really should have a page on how to use distcp.
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  • Hudson (JIRA) at Jun 16, 2008 at 10:40 pm
    [ https://issues.apache.org/jira/browse/HADOOP-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12605432#action_12605432 ]

    Hudson commented on HADOOP-2984:
    --------------------------------

    Integrated in Hadoop-trunk #520 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/520/])
    Distcp should have forrest documentation
    ----------------------------------------

    Key: HADOOP-2984
    URL: https://issues.apache.org/jira/browse/HADOOP-2984
    Project: Hadoop Core
    Issue Type: Task
    Components: util
    Reporter: Owen O'Malley
    Assignee: Chris Douglas
    Priority: Blocker
    Fix For: 0.18.0

    Attachments: 2984-0.patch, 2984-1.patch, 2984-2.patch, 2984-3.patch


    We really should have a page on how to use distcp.
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