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[HBASE-5509] MR based copier for copying HFiles (trunk version) - HBase - [issue]
...This copier is a modification of the distcp tool in HDFS. It does the following:1. List out all the regions in the HBase cluster for the required table2. Write the above out to a file3. Each...
http://issues.apache.org/jira/browse/HBASE-5509    Author: Karthik Ranganathan, 2014-03-14, 00:56
[HBASE-6925] Change socket write size from 8K to 64K for HBaseServer - HBase - [issue]
...Creating a JIRA for this, but the change is trivial: change NIO_BUFFER_LIMIT from 8K to 64K in HBaseServer. This seems to increase scan throughput....
http://issues.apache.org/jira/browse/HBASE-6925    Author: Karthik Ranganathan, 2013-09-18, 22:21
[HBASE-5355] Compressed RPC's for HBase - HBase - [issue]
...Some application need ability to do large batched writes and reads from a remote MR cluster. These eventually get bottlenecked on the network. These results are also pretty compressible some...
http://issues.apache.org/jira/browse/HBASE-5355    Author: Karthik Ranganathan, 2013-06-05, 00:27
[HBASE-6874] Implement prefetching for scanners - HBase - [issue]
...I did some quick experiments by scanning data that should be completely in memory and found that adding pre-fetching increases the throughput by about 50% from 26MB/s to 39MB/s.The idea is t...
http://issues.apache.org/jira/browse/HBASE-6874    Author: Karthik Ranganathan, 2013-05-25, 08:07
[HBASE-7477] Remove Proxy instance from HBase RPC - HBase - [issue]
...Currently, we use HBaseRPC.getProxy() to get an Invoker object to serialize the RPC parameters. This is pretty inefficient as it uses reflection to lookup the current method name.The aim is ...
http://issues.apache.org/jira/browse/HBASE-7477    Author: Karthik Ranganathan, 2013-04-30, 23:32
[HBASE-6770] Allow scanner setCaching to specify size instead of number of rows - HBase - [issue]
...Currently, we have the following api's to customize the behavior of scans:setCaching() - how many rows to cache on client to speed up scanssetBatch() - max columns per row to return per row ...
http://issues.apache.org/jira/browse/HBASE-6770    Author: Karthik Ranganathan, 2013-04-25, 19:04
[HBASE-6923] Create scanner benchmark - HBase - [issue]
...Create a simple program to benchmark performance/throughput of scanners, and print some results at the end....
http://issues.apache.org/jira/browse/HBASE-6923    Author: Karthik Ranganathan, 2013-04-25, 19:03
[HBASE-5783] Faster HBase bulk loader - HBase - [issue]
...We can get a 3x to 4x gain based on a prototype demonstrating this approach in effect (hackily) over the MR bulk loader for very large data sets by doing the following:1. Do direct multi-put...
http://issues.apache.org/jira/browse/HBASE-5783    Author: Karthik Ranganathan, 2013-03-24, 05:17
[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
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