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https://issues.apache.org/jira/browse/MAPREDUCE-3323?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Azuryy(Chijiong) updated MAPREDUCE-3323:
----------------------------------------
Description:
We put some file into Distributed Cache, but sometimes, only Map or Reduce use
thses cached files, not useful for both. but TaskTracker always download cached
files from HDFS, if there are some little bit big files in cache, it's time
expensive.
so, this patch add some new API in the DistributedCache.java as follow:
addArchiveToClassPathForMap
addArchiveToClassPathForReduce
addFileToClassPathForMap
addFileToClassPathForReduce
addCacheFileForMap
addCacheFileForReduce
addCacheArchiveForMap
addCacheArchiveForReduce
New API doesn't affect original interface. but they are specified for only map
or reduce, not both of them.
But if you do need cache file during both map and reduce, then use original
interface.
> Distributed Cache for Map or Reduce or Both
> -------------------------------------------
>
> Key: MAPREDUCE-3323
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3323
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Azuryy(Chijiong)
>
> We put some file into Distributed Cache, but sometimes, only Map or Reduce
> use thses cached files, not useful for both. but TaskTracker always download
> cached files from HDFS, if there are some little bit big files in cache, it's
> time expensive.
> so, this patch add some new API in the DistributedCache.java as follow:
> addArchiveToClassPathForMap
> addArchiveToClassPathForReduce
> addFileToClassPathForMap
> addFileToClassPathForReduce
> addCacheFileForMap
> addCacheFileForReduce
> addCacheArchiveForMap
> addCacheArchiveForReduce
> New API doesn't affect original interface. but they are specified for only
> map or reduce, not both of them.
> But if you do need cache file during both map and reduce, then use original
> interface.
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