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[HBASE-3718] Improve 'get' performance when row resides in memstore
...The regionserver uses a ConcurrentSkipList to store the KVs in the memstore. Although the order complexity of a lookup is O, still the latency to lookup a specific key in the memstore is ver...
, 2014-12-29, 12:52
[HBASE-3588] Proposal to optimize ReadWriteConsistencyControl
...The ReadWriteConsistencyControl (RWCC) mechanism facilitates making a set of memstore updates atomically visible to readers. Also, the rwcc.completeMemstoreInsert() blocks till the memstore ...
, 2014-07-18, 18:12
[HBASE-3833] ability to support includes/excludes list in Hbase
...An HBase cluster currently does not have the ability to specify that the master should accept regionservers only from a specified list. This helps preventing administrative errors where the ...
, 2014-06-20, 20:05
[HBASE-3504] HLog performance improvement
...The HLog.updateLock protects the rolling of logs with concurrent writes to the HDFS log file. This is a scalability bottleneck for a workload that comprises mostly of counter-increments....
, 2014-01-26, 15:35
[HBASE-4658] Put attributes are not exposed via the ThriftServer
...The Put api also takes in a bunch of arbitrary attributes that an application can use to associate metadata with each put operation. This is not exposed via Thrift....
, 2013-07-12, 13:49
[HBASE-5074] support checksums in HBase block cache
...The current implementation of HDFS stores the data in one block file and the metadata(checksum) in another block file. This means that every read into the HBase block cache actually consumes...
, 2013-03-27, 03:46
[HBASE-5640] bulk load runs slowly than before
...I am loading data from an external system into hbase. There are many prints of the form. This is possibly a regression caused by a recent patch.....on different filesystem than destination s...
, 2013-01-16, 17:54
[HBASE-5419] FileAlreadyExistsException has moved from mapred to fs package
...The FileAlreadyExistsException has moved from org.apache.hadoop.mapred.FileAlreadyExistsException to org.apache.hadoop.fs.FileAlreadyExistsException. HBase is currently using a class that is...
, 2012-09-28, 12:44
[HBASE-4528] The put operation can release the rowlock before sync-ing the Hlog
...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....
, 2012-09-05, 01:31
[HBASE-4487] The increment operation can release the rowlock before sync-ing the Hlog
...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....
, 2012-06-15, 02:41
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