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[HBASE-4528] The put operation can release the rowlock before sync-ing the Hlog - HBase - [issue]
...This allows for better throughput when there are hot rows. A single row update improves from 100 puts/sec/server to 5000 puts/sec/server....
http://issues.apache.org/jira/browse/HBASE-4528    Author: dhruba borthakur, 2012-09-05, 01:31
[HBASE-3855] Performance degradation of memstore because reseek is linear - HBase - [issue]
...The scanner use reseek to find the next row (or next column) as part of a scan. The reseek code iterates over a Set to position itself at the right place. If there are many thousands of kvs ...
http://issues.apache.org/jira/browse/HBASE-3855    Author: dhruba borthakur, 2012-07-07, 14:56
[HBASE-4487] The increment operation can release the rowlock before sync-ing the Hlog - HBase - [issue]
...This allows for better throughput when there are hot rows.I have seen this change make a single row update improve from 400 increments/sec/server to 4000 increments/sec/server....
http://issues.apache.org/jira/browse/HBASE-4487    Author: dhruba borthakur, 2012-06-15, 02:41
[HBASE-3899] enhance HBase RPC to support free-ing up server handler threads even if response is not ready - HBase - [issue]
...In the current implementation, the server handler thread picks up an item from the incoming callqueue, processes it and then wraps the response as a Writable and sends it back to the IPC ser...
http://issues.apache.org/jira/browse/HBASE-3899    Author: dhruba borthakur, 2012-05-11, 06:29
[HBASE-4989] Metrics to measure sequential reads and random reads separately - HBase - [issue]
...HBase does sequential reads for compactions and positional random reads for satisfying user's queries. It would be nice if we can measure their latencies separately. It is mostly the random ...
http://issues.apache.org/jira/browse/HBASE-4989    Author: dhruba borthakur, 2012-05-10, 18:12
[HBASE-5473] Metrics does not push pread time - HBase - [issue]
...The RegionServerMetrics is not pushing the pread times to the MetricsRecord...
http://issues.apache.org/jira/browse/HBASE-5473    Author: dhruba borthakur, 2012-05-10, 18:10
[HBASE-5295] Improve the Thrift API  to switch on/off writing to wal for Mutations - HBase - [issue]
...The thrift api currently does not support switching off updating wal for Puts/Deletes. Support it....
http://issues.apache.org/jira/browse/HBASE-5295    Author: dhruba borthakur, 2012-05-10, 18:10
[HBASE-5014] PutSortReducer should adhere to memory limits - HBase - [issue]
...The PutSortReduce class has a configurable threshold to flush partial sorted data for large rows. However, it was not using the size of the key in the calculation of overall memory used....
http://issues.apache.org/jira/browse/HBASE-5014    Author: dhruba borthakur, 2012-05-10, 18:10
[HBASE-5538] A metric to measure the size of the response queue in the hbase rpc server - HBase - [issue]
...The HbaseServer queues responses to client (if the client is slow). Expose a metric that records the size of the response queue....
http://issues.apache.org/jira/browse/HBASE-5538    Author: dhruba borthakur, 2012-05-10, 18:10
[HBASE-5560] Avoid RegionServer GC caused by timed-out calls - HBase - [issue]
...The HBaseRpcServer queues up rpc responses if the socket connection to the client is not yet ready to receive data. Calls are queued here until a 15 minute timeout occurs. I am able to gener...
http://issues.apache.org/jira/browse/HBASE-5560    Author: dhruba borthakur, 2012-05-10, 18:08
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