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[HBASE-3125] Allow HFile's bytes per checksum to be configured - HBase - [issue]
...It could be desirable to have a non-default bytes per checksum at the HDFS level.  This change requires some HDFS-side changes....
http://issues.apache.org/jira/browse/HBASE-3125    Author: Jonathan Gray, 2014-06-08, 23:04
[HBASE-3123] ZKW constructor should not always create nodes and should be more amenable to general usage - HBase - [issue]
...The constructor in ZooKeeperWatcher does too much.  It does things like create the layout in ZK.  It's probably not harmful but it's unnecessary.  It should ensure that the ba...
http://issues.apache.org/jira/browse/HBASE-3123    Author: Jonathan Gray, 2014-06-08, 23:03
[HBASE-2702] Add client API to expose bloom filter check - HBase - [issue]
...There may be some valid use cases where a user wants to check for existence of a given row or row+col using bloom filters but without performing the Get if the bloom gets a hit....
http://issues.apache.org/jira/browse/HBASE-2702    Author: Jonathan Gray, 2014-06-08, 22:57
[HBASE-4812] GC benchmarking and analysis tools - HBase - [issue]
...One of the challenges of debugging GC issues is that it can take a long time to reproduce GC pauses.  Isolating the LRU block cache and benchmarking it independently can more easily cau...
http://issues.apache.org/jira/browse/HBASE-4812    Author: Jonathan Gray, 2014-05-22, 01:18
[HBASE-3324] LRU block cache configuration improvements - HBase - [issue]
...The block cache has lots of configuration parameters but they aren't using Configuration like they should.It would also be nice to have a better way of doing hit ratios, like a rolling windo...
http://issues.apache.org/jira/browse/HBASE-3324    Author: Jonathan Gray, 2014-05-18, 05:08
[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
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