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[HBASE-4755] HBase based block placement in DFS - HBase - [issue]
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...The feature as is only useful for HBase clusters that care about data locality on regionservers, but this feature can also enable a lot of nice features down the road.The basic idea is as fo...
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http://issues.apache.org/jira/browse/HBASE-4755
Author: Karthik Ranganathan,
2013-06-20, 03:52
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[HBASE-3149] Make flush decisions per column family - HBase - [issue]
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...Today, the flush decision is made using the aggregate size of all column families. When large and small column families co-exist, this causes many small flushes of the smaller CF. We need to...
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http://issues.apache.org/jira/browse/HBASE-3149
Author: Karthik Ranganathan,
2013-06-11, 02:00
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[HBASE-5355] Compressed RPC's for HBase - HBase - [issue]
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...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...
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http://issues.apache.org/jira/browse/HBASE-5355
Author: Karthik Ranganathan,
2013-06-05, 00:27
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[HBASE-6874] Implement prefetching for scanners - HBase - [issue]
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...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...
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http://issues.apache.org/jira/browse/HBASE-6874
Author: Karthik Ranganathan,
2013-05-25, 08:07
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[HBASE-7477] Remove Proxy instance from HBase RPC - HBase - [issue]
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...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 ...
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http://issues.apache.org/jira/browse/HBASE-7477
Author: Karthik Ranganathan,
2013-04-30, 23:32
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[HBASE-6770] Allow scanner setCaching to specify size instead of number of rows - HBase - [issue]
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...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 ...
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http://issues.apache.org/jira/browse/HBASE-6770
Author: Karthik Ranganathan,
2013-04-25, 19:04
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[HBASE-6923] Create scanner benchmark - HBase - [issue]
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...Create a simple program to benchmark performance/throughput of scanners, and print some results at the end....
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http://issues.apache.org/jira/browse/HBASE-6923
Author: Karthik Ranganathan,
2013-04-25, 19:03
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[HBASE-5783] Faster HBase bulk loader - HBase - [issue]
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...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...
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http://issues.apache.org/jira/browse/HBASE-5783
Author: Karthik Ranganathan,
2013-03-24, 05:17
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[HBASE-7478] Create a multi-threaded responder - HBase - [issue]
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...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...
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http://issues.apache.org/jira/browse/HBASE-7478
Author: Karthik Ranganathan,
2013-01-25, 16:37
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[HBASE-6423] Writes should not block reads on blocking updates to memstores - HBase - [issue]
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...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...
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http://issues.apache.org/jira/browse/HBASE-6423
Author: Karthik Ranganathan,
2012-12-18, 02:19
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