[
https://issues.apache.org/jira/browse/CRUNCH-679?focusedWorklogId=204700&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-204700
]
ASF GitHub Bot logged work on CRUNCH-679:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 26/Feb/19 19:33
Start Date: 26/Feb/19 19:33
Worklog Time Spent: 10m
Work Description: noslowerdna commented on pull request #20: CRUNCH-679:
Improvements for usage of DistCp
URL: https://github.com/apache/crunch/pull/20
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
Issue Time Tracking
-------------------
Worklog Id: (was: 204700)
Time Spent: 10m
Remaining Estimate: 0h
> Improvements for usage of DistCp
> --------------------------------
>
> Key: CRUNCH-679
> URL: https://issues.apache.org/jira/browse/CRUNCH-679
> Project: Crunch
> Issue Type: Improvement
> Components: Core
> Reporter: Andrew Olson
> Assignee: Josh Wills
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> As a follow-up to CRUNCH-660 and CRUNCH-675, a handful of corrections and
> improvements have been identified during testing.
> * We need to preserve preferred part names, e.g. part-m-00000. Currently the
> DistCp support in Crunch does not make use of the FileTargetImpl#getDestFile
> method, and would therefore create destination file names like out0-m-00000,
> which are problematic when there are multiple map-only jobs writing to the
> same target path. This can be achieved by providing a custom CopyListing
> implementation that is capable of dynamically renaming target paths based on
> a given mapping. Unfortunately a substantial amount of code duplication from
> the original SimpleCopyListing class is currently required in order to inject
> the necessary logic for modifying the sequence file entry keys. HADOOP-16147
> has been opened to allow it to be simplified in the future.
> * The handleOutputs implementation in HFileTarget is essentially identical to
> the one in FileTargetImpl that it overrides. We can remove it and just share
> the same code.
> * It could be useful to add a property for configuring the max DistCp task
> bandwidth, as the default (100 MB/s per task) may be too high for certain
> environments.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
