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[HBASE-7478] Create a multi-threaded responder - HBase - [issue]
...Currently, we have multi-threaded readers and handlers, but a single threaded responder which is a bottleneck.ipc.server.reader.count  : number of reader threads to read data off the wi...
http://issues.apache.org/jira/browse/HBASE-7478    Author: Karthik Ranganathan, 2013-01-25, 16:37
[HBASE-6423] Writes should not block reads on blocking updates to memstores - HBase - [issue]
...We have a big data use case where we turn off WAL and have a ton of reads and writes. We found that:1. flushing a memstore takes a while (GZIP compression)2. incoming writes cause the new me...
http://issues.apache.org/jira/browse/HBASE-6423    Author: Karthik Ranganathan, 2012-12-18, 02:19
[HBASE-6583] Enhance Hbase load test tool to automatically create column families if not present - HBase - [issue]
...The load test tool currently disables the table and applies any changes to the cf descriptor if any, but does not create the cf if not present....
http://issues.apache.org/jira/browse/HBASE-6583    Author: Karthik Ranganathan, 2012-12-03, 21:47
[HBASE-7026] Make metrics collection in StoreScanner.java more efficient - HBase - [issue]
...Per the benchmarks I ran, the following block of code seems to be inefficient:StoreScanner.java:public synchronized boolean next(List<KeyValue> outResult, int limit,    ...
http://issues.apache.org/jira/browse/HBASE-7026    Author: Karthik Ranganathan, 2012-11-17, 16:45
[HBASE-7163] Low-hanging perf  improvements in HBase client - HBase - [issue]
...1. Change cachedRegionsLocations in HConnectionManager from SoftValueSortedMap to ConcurrentSkipListMap:This change saves 15% CPU on the client side per profiling. In using the ConcurrentSki...
http://issues.apache.org/jira/browse/HBASE-7163    Author: Karthik Ranganathan, 2012-11-16, 06:42
[HBASE-7105] RS throws NPE on forcing compaction from HBase shell on a single bulk imported file. - HBase - [issue]
...In StoreFile, we have:private AtomicBoolean majorCompaction = null;In StoreFile.open(), we do:b = metadataMap.get(MAJOR_COMPACTION_KEY);if (b != null) {  // init majorCompaction va...
http://issues.apache.org/jira/browse/HBASE-7105    Author: Karthik Ranganathan, 2012-11-06, 19:20
[HBASE-7100] Allow multiple connections from HBaseClient to each remote endpoint - HBase - [issue]
...Allowing multiple connections gives a huge boost while benchmarking performance. In a production setup, many nodes query a single regionserver. But one connection is not enough for a single ...
http://issues.apache.org/jira/browse/HBASE-7100    Author: Karthik Ranganathan, 2012-11-05, 23:40
[HBASE-7068] Create a Get benchmark - HBase - [issue]
http://issues.apache.org/jira/browse/HBASE-7068    Author: Karthik Ranganathan, 2012-10-29, 23:47
[HBASE-7067] HBase Get perf improvements - HBase - [issue]
...Umbrella task for improving Get performance....
http://issues.apache.org/jira/browse/HBASE-7067    Author: Karthik Ranganathan, 2012-10-29, 23:47
[HBASE-7029] Result array serialization improvements - HBase - [issue]
...The Result[] is very inefficiently serialized - there are 2 for loops over each result and we instantiate every object.A better way is to make it a data block, and use delta block encoding t...
http://issues.apache.org/jira/browse/HBASE-7029    Author: Karthik Ranganathan, 2012-10-22, 22:31
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