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[HBASE-5776] HTableMultiplexer - HBase - [issue]
...There is a known issue in HBase client that single slow/dead region server could slow down the multiput operations across all the region servers. So the HBase client will be as slow as the s...
http://issues.apache.org/jira/browse/HBASE-5776    Author: Liyin Tang, 2012-12-28, 19:17
[HBASE-7444] [89-fb] Update the default user name in MiniHBaseCluster - HBase - [issue]
...Currently we are using $username.hrs.$index as default user name in MiniHBaseCluster, which actually is not a legal user name....
http://issues.apache.org/jira/browse/HBASE-7444    Author: Liyin Tang, 2012-12-27, 19:35
[HBASE-7416]  [89-fb] Tier compaction with fixed boundary option - HBase - [issue]
...Currently, in tier compaction the aged-based algorithm considers HFile's age in disk relative to the current time, thus the tiers are actually shifting along the time. In order to best use o...
http://issues.apache.org/jira/browse/HBASE-7416    Author: Liyin Tang, 2012-12-22, 01:23
[HBASE-7348] [89-fb] Add some statistics from DFSClient to RegionServerMetrics - HBase - [issue]
...DFSClient actually collected a number of useful statistics such as bytesLocalRead, bytesLocalRackRead and so on. So this diff is going to merge these metrics into the RegionServerMetrics....
http://issues.apache.org/jira/browse/HBASE-7348    Author: Liyin Tang, 2012-12-13, 19:32
[HBASE-7276] [89-fb] Optimize the read/write requests metrics in the RegionServer level - HBase - [issue]
...In HBase, each RegionServer will host a set of Regions and both of them keep track of the read/write requests metrics. So total number of read/write requests among all the Regions shall be e...
http://issues.apache.org/jira/browse/HBASE-7276    Author: Liyin Tang, 2012-12-04, 23:18
[HBASE-7267] [89-fb] Only create the dummy hfile for the compaction if necessary. - HBase - [issue]
...In HBASE-6059, it introduced a new behavior that the compaction would create the HFileWriter no mater whether there is any key/value as the output or not. This new behavior actually is confl...
http://issues.apache.org/jira/browse/HBASE-7267    Author: Liyin Tang, 2012-12-04, 21:06
[HBASE-7275] [89-fb] Fixing some minor bugs in 89-fb branch - HBase - [issue]
...[89-fb] Fixing some minor bugs in 89-fb branch based on the findBugs report...
http://issues.apache.org/jira/browse/HBASE-7275    Author: Liyin Tang, 2012-12-04, 20:04
[HBASE-7164] [89-fb] Using HFileOutputFormat as MapOutputFormat - HBase - [issue]
...Add one more option in TableMapReduceUtil to initialize a Map only job which takes TableInputFormat as MapInputFormat and HFileOutputFormat as MapOutputFormat....
http://issues.apache.org/jira/browse/HBASE-7164    Author: Liyin Tang, 2012-11-15, 00:08
[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
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