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[HBASE-6981] multiple commit logs per region server - HBase - [issue]
...For write dominated workloads, the fact that we have only 1 commit log per server  artificially limits the aggregate throughput to that of one disk (this is especially true if we do tru...
http://issues.apache.org/jira/browse/HBASE-6981    Author: Kannan Muthukkaruppan, 2014-08-07, 17:16
[HBASE-2478] Experiment with alternate settings for io.bytes.per.checksum for HFiles - HBase - [issue]
...HDFS keeps a separate "checksum" file for every  block. By default, io.bytes.per.checksum is set at 512, and the checksums are 4 bytes... i.e. for every 512 bytes of data in the block w...
http://issues.apache.org/jira/browse/HBASE-2478    Author: Kannan Muthukkaruppan, 2014-07-19, 01:43
[HBASE-3300] force delete option for use cases that explicitly set version/timestamp - HBase - [issue]
...Background: For use cases that explicitly set versions, after a delete, it is not possible to insert values with older versions. So for example if you did a puts (v1) and delete (@ v2), subs...
http://issues.apache.org/jira/browse/HBASE-3300    Author: Kannan Muthukkaruppan, 2014-07-19, 01:31
[HBASE-3276] delete followed by a put with the same timestamp - HBase - [issue]
...[Note: This issue is relevant only for cases that don't use the default "time" based versions, but provide/manage versions explicitly.]The fix for HBASE-1485 ensures th...
http://issues.apache.org/jira/browse/HBASE-3276    Author: Kannan Muthukkaruppan, 2014-07-19, 01:31
[HBASE-2966] HBase client stuck on org.apache.zookeeper.ClientCnxn.submitRequest(ClientCnxn.java:1278) holding regionLockObject lock - HBase - [issue]
...We noticed in one case the HBase client program got stuck on Zookeeper.exists() call.One of the threads was stuck here on the ZK call while holding an HBase level lock (regionLockObject in l...
http://issues.apache.org/jira/browse/HBASE-2966    Author: Kannan Muthukkaruppan, 2014-07-17, 00:03
[HBASE-4433] avoid extra next (potentially a seek) if done with column/row - HBase - [issue]
...[Noticed this in 89, but quite likely true of trunk as well.]When we are done with the requested column(s) the code still does an extra next() call before it realizes that it is actu...
http://issues.apache.org/jira/browse/HBASE-4433    Author: Kannan Muthukkaruppan, 2013-10-27, 05:13
[HBASE-3443] ICV optimization to look in memstore first and then store files (HBASE-3082) does not work when deletes are in the mix - HBase - [issue]
...For incrementColumnValue() HBASE-3082 adds an optimization to check memstores first, and only if not present in the memstore then check the store files. In the presence of deletes, the above...
http://issues.apache.org/jira/browse/HBASE-3443    Author: Kannan Muthukkaruppan, 2013-09-18, 23:13
[HBASE-6217] reduce overhead of maintaing get/next size metric - HBase - [issue]
...[Forked off this specific issue as a separate JIRA from HBASE-6066].Reduce overhead of "size metric" maintained in StoreScanner.next().if (metric != null) {     HRegio...
http://issues.apache.org/jira/browse/HBASE-6217    Author: Kannan Muthukkaruppan, 2013-05-04, 00:21
[HBASE-3967] Support deletes in HFileOutputFormat based bulk import mechanism - HBase - [issue]
...During bulk imports, it'll be useful to be able to do delete mutations (either to delete data that already exists in HBase or was inserted earlier during this run of the import). For example...
http://issues.apache.org/jira/browse/HBASE-3967    Author: Kannan Muthukkaruppan, 2013-04-09, 07:29
[HBASE-5292] getsize per-CF metric incorrectly counts compaction related reads as well - HBase - [issue]
...The per-CF "getsize" metric's intent was to track bytes returned (to HBase clients) per-CF. Note: We already have metrics to track # of HFileBlock's read for compaction vs. non-compaction ca...
http://issues.apache.org/jira/browse/HBASE-5292    Author: Kannan Muthukkaruppan, 2013-04-07, 05:33
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