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[HBASE-7266] [89-fb] Using pread for non-compaction read request - HBase - [issue]
...There are 2 kinds of read operations in HBase: pread and seek+read.Pread, positional read, is stateless and create a new connection between the DFSClient and DataNode for each operation. Whi...
http://issues.apache.org/jira/browse/HBASE-7266    Author: Liyin Tang, 2013-09-11, 18:04
[HBASE-5032] Add other DELETE type information into the delete bloom filter to optimize the time range query - HBase - [issue]
...To speed up time range scans we need to seek to the maximum timestamp of the requested range,instead of going to the first KV of the (row, column) pair and iterating from there. If we don't ...
http://issues.apache.org/jira/browse/HBASE-5032    Author: Liyin Tang, 2013-08-07, 19:12
[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
RE: Does HBase RegionServer benefit from OS Page Cache - HBase - [mail # user]
...Hi Enis, Good ideas ! And hbase community is driving on these 2 items. 1) [HBASE-7404]: L1/L2 block cache 2) [HBASE-5263] Preserving cached data on compactions through cache-on-write   ...
   Author: Liyin Tang, 2013-03-25, 19:18
[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
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