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[HBASE-6428] Pluggable Compaction policies - HBase - [issue]
...For some usecases is useful to allow more control over how KVs get compacted.For example one could envision storing old versions of a KV separate HFiles, which then rarely have to be touched...
http://issues.apache.org/jira/browse/HBASE-6428    Author: Lars Hofhansl, 2013-05-14, 01:20
[HBASE-6755] HRegion.internalObtainRowLock uses unecessary AtomicInteger - HBase - [issue]
...I was looking at HBase's implementation of locks and saw that is unnecessarily uses an AtomicInteger to obtain a unique lockid.The observation is that we only need a unique one and don't car...
http://issues.apache.org/jira/browse/HBASE-6755    Author: Lars Hofhansl, 2013-05-07, 19:46
[HBASE-5746] HFileDataBlockEncoderImpl uses wrong header size when reading HFiles with no checksums (0.96) - HBase - [issue]
http://issues.apache.org/jira/browse/HBASE-5746    Author: Lars Hofhansl, 2013-05-07, 15:54
[HBASE-5622] Improve efficiency of mapred vesion of RowCounter - HBase - [issue]
http://issues.apache.org/jira/browse/HBASE-5622    Author: Lars Hofhansl, 2013-05-02, 04:49
[HBASE-6116] Allow parallel HDFS writes for HLogs. - HBase - [issue]
...In HDFS-1783 I adapted Dhrubas changes to be used in Hadoop trunk.This issue will include the necessary reflection changes to optionally enable this for the WALs in HBase....
http://issues.apache.org/jira/browse/HBASE-6116    Author: Lars Hofhansl, 2013-05-01, 06:47
[HBASE-7755] Experiment with LAB in BlockEndcoding - HBase - [issue]
...I was looking at and profiling the BlockEncoding code to figure out how to make it faster. One issue that jumped out was we call ByteBuffer.allocate(...) for each single KV.As an experiment ...
http://issues.apache.org/jira/browse/HBASE-7755    Author: Lars Hofhansl, 2013-05-01, 06:43
[HBASE-8388] Use ROW bloom filter for scanning - HBase - [issue]
...Currently only ROWCOL BFs are used during the scanning process. It seems we could make use of ROW BFs in StoreFileScanner.requestSeek.See HBASE-8362 for background....
http://issues.apache.org/jira/browse/HBASE-8388    Author: Lars Hofhansl, 2013-04-25, 07:18
[HBASE-5472] LoadIncrementalHFiles loops forever if the target table misses a CF - HBase - [issue]
...I have some HFiles for two column families 'y','z', but I specified a target table that only has CF 'y'.I see the following repeated forever....12/02/23 22:57:37 WARN mapreduce.LoadIncrement...
http://issues.apache.org/jira/browse/HBASE-5472    Author: Lars Hofhansl, 2013-04-24, 13:22
[HBASE-6799] Store more metadata in HFiles - HBase - [issue]
...Current we store metadata in HFile: the timerange of KVs the earliest PUT ts max sequence id whether or not this file was created from a major compaction.I would like to brainstorm what extr...
http://issues.apache.org/jira/browse/HBASE-6799    Author: Lars Hofhansl, 2013-04-19, 22:01
[HBASE-7239] Verify protobuf serialization is correctly chunking upon read to avoid direct memory OOMs - HBase - [issue]
...Result.readFields() used to read from the input stream in 8k chunks to avoid OOM issues with direct memory.(Reading variable sized chunks into direct memory prevent the JVM from reusing the ...
http://issues.apache.org/jira/browse/HBASE-7239    Author: Lars Hofhansl, 2013-04-19, 09:40
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