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https://issues.apache.org/jira/browse/HADOOP-8705?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dhruv Kumar updated HADOOP-8705:
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Description:
Having a cache on mappers and reducers could be very useful for some use cases,
including but not limited to:
1. Iterative Map Reduce Programs: Some machine learning algorithms frequently
need access to invariant data (see Mahout) over each iteration of MapReduce
until convergence. A cache on such nodes could allow easy access to the hotset
of data without going all the way to the distributed cache.
2. Storing of intermediate map and reduce outputs in memory to reduce shuffling
time. This optimization has been discussed at length in Haloop
(http://www.ics.uci.edu/~yingyib/papers/HaLoop_camera_ready.pdf).
There are some other scenarios as well where having a cache could come in
handy.
It will be nice to have some sort of pluggable support for JSR 107 compliant
caches.
was:
Having a cache on mappers and reducers could be very useful for some use cases,
including but not limited to:
1. Iterative Map Reduce Programs: Some machine learning algorithms frequently
need access to invariant data (see Mahout) over each iteration of MapReduce
until convergence. A cache on such nodes could allow easy access to the hotset
of data without going all the way to the distributed cache.
2. Storing of intermediate map and reduce outputs in memory to reduce shuffling
time. This optimization has been discussed at length in Haloop
(http://www.ics.uci.edu/~yingyib/papers/HaLoop_camera_ready.pdf).
There are some other scenarios as well where having a cache could come in
handy.
It will be nice to have some sort of pluggable support for JSR 107 compliant
caches.
. Now that JSR 107 is a caching standard, it will be nice
> Add JSR 107 Caching support
> ----------------------------
>
> Key: HADOOP-8705
> URL: https://issues.apache.org/jira/browse/HADOOP-8705
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Dhruv Kumar
>
> Having a cache on mappers and reducers could be very useful for some use
> cases, including but not limited to:
> 1. Iterative Map Reduce Programs: Some machine learning algorithms frequently
> need access to invariant data (see Mahout) over each iteration of MapReduce
> until convergence. A cache on such nodes could allow easy access to the
> hotset of data without going all the way to the distributed cache.
> 2. Storing of intermediate map and reduce outputs in memory to reduce
> shuffling time. This optimization has been discussed at length in Haloop
> (http://www.ics.uci.edu/~yingyib/papers/HaLoop_camera_ready.pdf).
> There are some other scenarios as well where having a cache could come in
> handy.
> It will be nice to have some sort of pluggable support for JSR 107 compliant
> caches.
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