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[HBASE-2459] Use finer-grain locking in HConnectionManager - HBase - [issue]
...Currently we synchronize within HConnectionManager.locateRegionInMeta() when looking up the cached location (and querying meta if not cached).  We use the same lock for every user-space...
http://issues.apache.org/jira/browse/HBASE-2459    Author: Jonathan Gray, 2014-01-26, 22:07
[HBASE-1501] Benchmark Tool for 0.20 API - HBase - [issue]
...I wrote a set of classes to aid in benchmarking puts, gets, and scans for various table schemas and patterns.We can turn this in to something as part of contrib down the road, but for now th...
http://issues.apache.org/jira/browse/HBASE-1501    Author: Jonathan Gray, 2014-01-26, 19:49
[HBASE-1177] Delay when client is located on the same node as the regionserver - HBase - [issue]
...During testing of HBASE-80, we uncovered a strange 40ms delay for random reads.  We ran a series of tests and found that it only happens when the client is on the same node as the RS an...
http://issues.apache.org/jira/browse/HBASE-1177    Author: Jonathan Gray, 2013-06-20, 22:57
[HBASE-2549] Review Trackers (column, delete, etc) on Trunk after 2248 goes in for correctness and optimal earlying-out - HBase - [issue]
...Once we move to all Scans, the trackers could use a refresh.  There are often times where we return, for example, a MatchCode.SKIP (which just goes to the next KV not including the curr...
http://issues.apache.org/jira/browse/HBASE-2549    Author: Jonathan Gray, 2013-04-15, 23:46
[HBASE-2832] Priorities and multi-threading for MemStore flushing - HBase - [issue]
...Similar to HBASE-1476 and HBASE-2646 which are for compactions, but do this for flushes.Flushing when we hit the normal flush size is a low priority flush.  Other types of flushes (heap...
http://issues.apache.org/jira/browse/HBASE-2832    Author: Jonathan Gray, 2013-04-15, 23:44
[HBASE-3341] Increment Row-Level Group Commit via Coprocessors - HBase - [issue]
...A specialized group commit for increment operations to deal with hot rows, built with coprocessors....
http://issues.apache.org/jira/browse/HBASE-3341    Author: Jonathan Gray, 2013-04-15, 23:32
[HBASE-2970] Meta blocks should be given their own priority bucket in block cache - HBase - [issue]
...Bloom filters are currently using the LRU block cache.  They are being treated as normal data blocks, however, it would be advantageous if we could treat me separately and give them the...
http://issues.apache.org/jira/browse/HBASE-2970    Author: Jonathan Gray, 2013-04-15, 23:26
[HBASE-2500] Block indexes and meta blocks should be put into the LRU - HBase - [issue]
...Currently we are not tracking the heap usage of block indexes.  We're just relying on the fact that we leave a large percentage of total heap as part of "everything else" not in memstor...
http://issues.apache.org/jira/browse/HBASE-2500    Author: Jonathan Gray, 2013-04-15, 23:25
[HBASE-3171] Drop ROOT and instead store META location(s) directly in ZooKeeper - HBase - [issue]
...Rather than storing the ROOT region location in ZooKeeper, going to ROOT, and reading the META location, we should just store the META location directly in ZooKeeper.The purpose of the root ...
http://issues.apache.org/jira/browse/HBASE-3171    Author: Jonathan Gray, 2013-04-09, 16:52
[HBASE-4697] Block cache reference should not be static - HBase - [issue]
...After the introduction of CacheConfig, over in HBASE-4641 we dealt with a bug of the block cache being instantiated in the master.  A short-term fix was done there.This is the real fix....
http://issues.apache.org/jira/browse/HBASE-4697    Author: Jonathan Gray, 2013-02-26, 06:20
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