Anoop Sam John
Stephen Yuan Jiang
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[HBASE-5313] Restructure hfiles layout for better compression
...A HFile block contain a stream of key-values. Can we can organize these kvs on the disk in a better way so that we get much greater compression ratios?One option (thanks Prakash) is to store...
, 2016-07-04, 13:52
[HBASE-3434] ability to increment a counter without reading original value from storage
...There are a bunch of applications that do read-modify-write operations on HBase constructs, e.g a counter; The counter value has to be read in from hdfs before it can be incremented. &...
, 2016-03-24, 22:17
[HBASE-3719] Workload has to drain before hlog can be rolled
...In the current implementation, the regionserver blocks new transactions from occuring when the HLog is rolled. Closing the existing HLog sometimes takes more than a few seconds and during th...
, 2014-12-30, 17:38
[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, 19:52
[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 ...
, 2014-07-19, 02:12
[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 ...
, 2014-06-21, 04:05
[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, 22:35
[HBASE-3787] Increment is non-idempotent but client retries RPC
...The HTable.increment() operation is non-idempotent. The client retries the increment RPC a few times (as specified by configuration) before throwing an error to the application. This makes i...
, 2013-12-11, 19:26
[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
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