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[HBASE-9102] HFile block pre-loading for large sequential scan - HBase - [issue]
...The current HBase scan model cannot take full advantage of the aggrediate disk throughput, especially for the large sequential scan cases. And for the large sequential scan, it is easy to pr...
http://issues.apache.org/jira/browse/HBASE-9102    Author: Liyin Tang, 2013-08-02, 03:59
[HBASE-6930] [89-fb] Avoid acquiring the same row lock repeatedly - HBase - [issue]
...When processing the multiPut, multiMutations or multiDelete operations, each IPC handler thread tries to acquire a lock for each row key in these batches. If there are duplicated row keys in...
http://issues.apache.org/jira/browse/HBASE-6930    Author: Liyin Tang, 2013-06-27, 18:51
[HBASE-6136] Optimize the multi get to be executed in parallel. - HBase - [issue]
...Currently the multiAction will be executed by one IPC handler thread in the server side. It would be more efficient to optimize the multi get particularly to be executed in parallel since th...
http://issues.apache.org/jira/browse/HBASE-6136    Author: Liyin Tang, 2013-05-23, 04:35
[HBASE-6103] Optimize the HBaseServer to deserialize the data for each ipc connection in parallel - HBase - [issue]
...Currently HBaseServer is running with a single listener thread, which is responsible for accepting the connection, reading the data from network channel, deserializing the data into writable...
http://issues.apache.org/jira/browse/HBASE-6103    Author: Liyin Tang, 2013-01-16, 00:31
[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
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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