Add in-memory caching of data
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Key: HADOOP-1398
URL: https://issues.apache.org/jira/browse/HADOOP-1398
Project: Hadoop
Issue Type: New Feature
Components: contrib/hbase
Reporter: Jim Kellerman
Priority: Minor
Bigtable provides two in-memory caches: one for row/column data and one for
disk block caches.
The size of each cache should be configurable, data should be loaded lazily,
and the cache managed by an LRU mechanism.
One complication of the block cache is that all data is read through a
SequenceFile.Reader which ultimately reads data off of disk via a RPC proxy for
ClientProtocol. This would imply that the block caching would have to be pushed
down to either the DFSClient or SequenceFile.Reader
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