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[HBASE-6066] some low hanging read path improvement ideas - HBase - [issue]
...I was running some single threaded scan performance tests for a table with small sized rows that is fully cached. Some observations...We seem to be doing several wasteful iterations over and...
http://issues.apache.org/jira/browse/HBASE-6066    Author: Kannan Muthukkaruppan, 2013-04-04, 22:16
[HBASE-4443] optimize/avoid seeking to "previous" block when key you are interested in is the first one of a block - HBase - [issue]
...This issue primarily affects cases when you are storing large blobs, i.e. when blocks contain small number of keys, and the chances of the key you are looking for being the first block of a ...
http://issues.apache.org/jira/browse/HBASE-4443    Author: Kannan Muthukkaruppan, 2013-03-24, 00:59
[HBASE-3907] make it easier to add per-CF metrics; add some key per-CF metrics to start with - HBase - [issue]
...Add plumbing needed to add various types of per ColumnFamily metrics. And to start with add a bunch per-CF metrics such as:1) Blocks read, cache hit, avg time of read for a column family.2) ...
http://issues.apache.org/jira/browse/HBASE-3907    Author: Kannan Muthukkaruppan, 2013-02-26, 19:24
[HBASE-6980] Parallel Flushing Of Memstores [89-fb] - HBase - [issue]
...For write dominated workloads, single threaded memstore flushing is an unnecessary bottleneck. With a single flusher thread, we are basically not setup to take advantage of the aggregate thr...
http://issues.apache.org/jira/browse/HBASE-6980    Author: Kannan Muthukkaruppan, 2013-02-09, 06:54
[HBASE-7011] log rolling and cache flushing should be able to proceed in parallel - HBase - [issue]
...Today, during a memstore flush (snapshot of memstore + flushing to disk), log rolling cannot happen. This seems like a bad design, and an unnecessary restriction. Possible reasons cited for ...
http://issues.apache.org/jira/browse/HBASE-7011    Author: Kannan Muthukkaruppan, 2013-01-25, 20:23
[HBASE-2283] row level atomicity - HBase - [issue]
...The flow during a HRegionServer.put() seems to be the following. [For now, let's just consider single row Put containing edits to multiple column families/columns.HRegionServer.put() does a:...
http://issues.apache.org/jira/browse/HBASE-2283    Author: Kannan Muthukkaruppan, 2012-12-15, 07:49
[HBASE-2861] regionserver's logsyncer thread hangs on DFSClient$DFSOutputStream.waitForAckedSeqno - HBase - [issue]
...During loads into HBase, we are noticing that a RS is sometimes getting stuck.The logSyncer thread:at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.waitForAckedSeqno(DFSClient.java:3367)&...
http://issues.apache.org/jira/browse/HBASE-2861    Author: Kannan Muthukkaruppan, 2012-11-03, 00:16
[HBASE-6728] [89-fb] prevent OOM possibility due to per connection responseQueue being unbounded - HBase - [issue]
...The per connection responseQueue is an unbounded queue. The request handler threads today try to send the response in line, but if things start to backup, the response is sent via a per conn...
http://issues.apache.org/jira/browse/HBASE-6728    Author: Kannan Muthukkaruppan, 2012-10-24, 19:06
[HBASE-6727] [89-fb] allow HBaseServers's callqueue to be better configurable to avoid OOMs - HBase - [issue]
...The callQueue size (where requests get queued up if all handlers are busy) is a LinkedBlockingQueue of size 100 * number_of_handlers. So, with say 300 handler threads, the call queue can hav...
http://issues.apache.org/jira/browse/HBASE-6727    Author: Kannan Muthukkaruppan, 2012-10-21, 01:01
[HBASE-5104] Provide a reliable intra-row pagination mechanism - HBase - [issue]
...Addendum:Doing pagination (retrieving at most "limit" number of KVs at a particular "offset") is currently supported via the ColumnPaginationFilter. However, it is not a very clean way of su...
http://issues.apache.org/jira/browse/HBASE-5104    Author: Kannan Muthukkaruppan, 2012-10-04, 22:52
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