[hbase] Refactor classes into Client, Master, and Regionserver packages
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Key: HADOOP-2684
URL: https://issues.apache.org/jira/browse/HADOOP-2684
Project: Hadoop
Issue Type: Improvement
Components: contrib/hbase
Reporter: Bryan Duxbury
Assignee: Bryan Duxbury
Priority: Minor
Fix For: 0.17.0
I've been crawling around the HBase codebase for a little while now, and I
think I have a proposal that would make it easer to find your way around in the
codebase in general.
I think that we should make three new packages below org.apache.hadoop.hbase,
client, master, and regionserver. The client package would contain HTable,
client-side scanning stuff, HBaseAdmin, the MapReduce-related stuff, the shell,
REST and Thrift. The master package would contain HMaster, maybe Leases, any
other classes that belong to master. The regionserver package would contain
HRegionServer, HRegion, HStore and all its subclasses (HStoreFile, etc).
Whatever is left over should be stuff that's pretty common to all the
sub-packages, so we can either leave that in the hbase package, or push it down
into a common subpackage.
This would make it much easier for new contributors to decide where to look for
stuff, as well as make it more obvious what the architectural divisions of the
system are. To boot, it would allow us to reorganize our tests into similar
subpackages, which has the advantage of allowing us to think about, for
instance, client tests passing/failing as a group, rather than scattered
alphabetically throughout the entire suite.
This idea would probably erase HADOOP-2518, or at least change the goal to
factor HStore down into o.a.h.h.regionserver.store.
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