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[HBASE-5930] Limits the amount of time an edit can live in the memstore. - HBase - [issue]
...A colleague of mine ran into an interesting issue.He inserted some data with the WAL disabled, which happened to fit in the aggregate Memstores memory.Two weeks later he a had problem with t...
http://issues.apache.org/jira/browse/HBASE-5930    Author: Lars Hofhansl, 2013-06-03, 16:50
[HBASE-8525] Use sleep multilier when choosing sinks in ReplicationSource - HBase - [issue]
...Currently we see this every second. Filling up the log:2013-05-10 18:36:00,766 INFO org.apache.zookeeper.ClientCnxn: Opening socket connection to server ist6-mnds1-2-sfm.ops.sfdc.net/10.224....
http://issues.apache.org/jira/browse/HBASE-8525    Author: Lars Hofhansl, 2013-05-23, 06:51
[HBASE-6523] HConnectionImplementation still does not recover from all ZK issues. - HBase - [issue]
...During some testing here at Salesforce.com we found another scenario where an HConnectionImplementation would never recover from a lost ZK connection....
http://issues.apache.org/jira/browse/HBASE-6523    Author: Lars Hofhansl, 2013-05-16, 08:39
[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
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