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Sangjin Lee commented on HADOOP-9639: ------------------------------------- [~stev...@iseran.com], thanks much for your valuable comments. I'm going to go over them and reply soon. Thanks again! > 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 > Assignee: Sangjin Lee > Attachments: shared_cache_design.pdf, shared_cache_design_v2.pdf, > shared_cache_design_v3.pdf, shared_cache_design_v4.pdf > > > 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. -- This message was sent by Atlassian JIRA (v6.1.4#6159)