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[HBASE-5987] HFileBlockIndex improvement - HBase - [issue]
...Recently we find out a performance problem that it is quite slow when multiple requests are reading the same block of data or index. From the profiling, one of the causes is the IdLock conte...
http://issues.apache.org/jira/browse/HBASE-5987    Author: Liyin Tang, 2012-11-05, 01:35
[HBASE-6968] Several HBase write perf improvement - HBase - [issue]
...Here are 2 hbase write performance improvements recently:1) Avoid creating HBaseConfiguraiton object for each HLog. Every time when creating a HBaseConfiguraiton object, it would parse the x...
http://issues.apache.org/jira/browse/HBASE-6968    Author: Liyin Tang, 2012-10-27, 00:46
[HBASE-6858] Fix the incorrect BADVERSION checking in the recoverable zookeeper - HBase - [issue]
...Thanks for Stack and Kaka's reporting that there is a bug in the recoverable zookeeper when handling BADVERSION exception for setData(). It shall compare the ID payload of the data in zk wit...
http://issues.apache.org/jira/browse/HBASE-6858    Author: Liyin Tang, 2012-10-17, 01:31
[HBASE-3857] Change the HFile Format - HBase - [issue]
...In order to support HBASE-3763 and HBASE-3856, we need to change the format of the HFile. The new format proposal is attached here. Thanks for Mikhail Bautin for the documentation....
http://issues.apache.org/jira/browse/HBASE-3857    Author: Liyin Tang, 2012-10-10, 16:08
[HBASE-3731] NPE in HTable.getRegionsInfo() - HBase - [issue]
...In HTable.getRegionInfo<code>HRegionInfo info = Writables.getHRegionInfo(            rowResult.getValue(HConstants.CATALOG_FAMILY,    ...
http://issues.apache.org/jira/browse/HBASE-3731    Author: Liyin Tang, 2012-09-27, 23:26
[HBASE-3663] The starvation problem in current load balance algorithm - HBase - [issue]
...This is an interesting starvation case. There are 2 conditions to trigger this problem.Condition1: r/s - r/(s+1) << 1 Let r: the number of regionsLet s: the number of serversCondition2...
http://issues.apache.org/jira/browse/HBASE-3663    Author: Liyin Tang, 2012-09-21, 04:05
[HBASE-5403] Checkpoint the compressed HLog - HBase - [issue]
...Let's assume that HBase replication can be based on replaying the HLog in the replica cluster.The replica process could be crash during the replay. Obviously, the replica process need a way ...
http://issues.apache.org/jira/browse/HBASE-5403    Author: Liyin Tang, 2012-08-31, 19:36
[HBASE-4001] when region has been OPENING for too long, the master should not reassign region - HBase - [issue]
...When the region server R1 and data node D1 running in the same machine and let's assuem this machine pub into repair,the master will try to reassign all the regions in the region server to o...
http://issues.apache.org/jira/browse/HBASE-4001    Author: Liyin Tang, 2012-08-29, 00:03
[HBASE-6673] Clear up the invalid ResultScanner in the ThriftServerRunner - HBase - [issue]
...Clear up the invalid ResultScanner in the ThriftServerRunner...
http://issues.apache.org/jira/browse/HBASE-6673    Author: Liyin Tang, 2012-08-28, 05:44
[HBASE-6235] Reset the max and min for the time varying metrics - HBase - [issue]
...The max and min values for time varying metrics are not reset to 0 correctly. The fix is to reset them during the JMX refresh time....
http://issues.apache.org/jira/browse/HBASE-6235    Author: Liyin Tang, 2012-06-19, 01:23
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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