Sangjin Lee created HADOOP-9639:
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Summary: truly shared cache for jars (jobjar/libjar)
Key: HADOOP-9639
URL: https://issues.apache.org/jira/browse/HADOOP-9639
Project: Hadoop Common
Issue Type: New Feature
Components: filecache
Affects Versions: 2.0.4-alpha
Reporter: Sangjin Lee
Currently there is the distributed cache that enables you to cache jars and
files so that attempts from the same job can reuse them. However, sharing is
limited with the distributed cache because it is normally on a per-job basis.
On a large cluster, sometimes copying of jobjars and libjars becomes so
prevalent that it consumes a large portion of the network bandwidth, not to
speak of defeating the purpose of "bringing compute to where data is". This is
wasteful because in most cases code doesn't change much across many jobs.
I'd like to propose and discuss feasibility of introducing a truly shared cache
so that multiple jobs from multiple users can share and cache jars. This JIRA
is to open the discussion.
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