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[HBASE-3719] Workload has to drain before hlog can be rolled - HBase - [issue]
...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...
http://issues.apache.org/jira/browse/HBASE-3719    Author: dhruba borthakur, 2014-12-30, 17:38
[HBASE-3718] Improve 'get' performance when row resides in memstore - HBase - [issue]
...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...
http://issues.apache.org/jira/browse/HBASE-3718    Author: dhruba borthakur, 2014-12-29, 19:52
[HBASE-3588] Proposal to optimize ReadWriteConsistencyControl - HBase - [issue]
...The ReadWriteConsistencyControl (RWCC) mechanism facilitates making a set of memstore updates atomically visible to readers. Also, the rwcc.completeMemstoreInsert() blocks till the memstore ...
http://issues.apache.org/jira/browse/HBASE-3588    Author: dhruba borthakur, 2014-07-19, 02:12
[HBASE-3833] ability to support includes/excludes list in Hbase - HBase - [issue]
...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 ...
http://issues.apache.org/jira/browse/HBASE-3833    Author: dhruba borthakur, 2014-06-21, 04:05
[HBASE-3504] HLog performance improvement - HBase - [issue]
...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....
http://issues.apache.org/jira/browse/HBASE-3504    Author: dhruba borthakur, 2014-01-26, 22:35
[HBASE-3787] Increment is non-idempotent but client retries RPC - HBase - [issue]
...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...
http://issues.apache.org/jira/browse/HBASE-3787    Author: dhruba borthakur, 2013-12-11, 19:26
[HBASE-5313] Restructure hfiles layout for better compression - HBase - [issue]
...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...
http://issues.apache.org/jira/browse/HBASE-5313    Author: dhruba borthakur, 2013-08-23, 00:43
[HBASE-4658] Put attributes are not exposed via the ThriftServer - HBase - [issue]
...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....
http://issues.apache.org/jira/browse/HBASE-4658    Author: dhruba borthakur, 2013-07-12, 13:49
[HBASE-5074] support checksums in HBase block cache - HBase - [issue]
...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...
http://issues.apache.org/jira/browse/HBASE-5074    Author: dhruba borthakur, 2013-03-27, 03:46
[HBASE-5640] bulk load runs slowly than before - HBase - [issue]
...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...
http://issues.apache.org/jira/browse/HBASE-5640    Author: dhruba borthakur, 2013-01-16, 17:54
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB