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[HBASE-14869] Better request latency histograms - HBase - [issue]
...I just discussed this with a colleague.The get, put, etc, histograms that each region server keeps are somewhat useless (depending on what you want to achieve of course), as they are aggrega...
http://issues.apache.org/jira/browse/HBASE-14869    Author: Lars Hofhansl, 2015-11-28, 22:59
[HBASE-13082] Coarsen StoreScanner locks to RegionScanner - HBase - [issue]
...Continuing where HBASE-10015 left of.We can avoid locking (and memory fencing) inside StoreScanner by deferring to the lock already held by the RegionScanner.In tests this shows quite a scan...
http://issues.apache.org/jira/browse/HBASE-13082    Author: Lars Hofhansl, 2015-11-25, 18:47
[HBASE-14791] Batch Deletes in MapReduce jobs (0.98) - HBase - [issue]
...We found that some of our copy table job run for many hours, even when there isn't that much data to copy.Vikas Vishwakarma did his magic and found that the issue is with copying delete mark...
http://issues.apache.org/jira/browse/HBASE-14791    Author: Lars Hofhansl, 2015-11-19, 18:55
[HBASE-12621] Explain in the book when KEEP_DELETED_CELLS is useful - HBase - [issue]
...KEEP_DELETED_CELLS seems to be very confusing.The books need further clarification when this setting is useful and what the implications are.(and maybe we should discuss if there's a simpler...
http://issues.apache.org/jira/browse/HBASE-12621    Author: Lars Hofhansl, 2015-11-13, 17:32
[HBASE-13318] RpcServer.getListenerAddress should handle when the accept channel is closed - HBase - [issue]
...We just saw exceptions like these:Exception in thread "B.DefaultRpcServer.handler=45,queue=0,port=60020" java.lang.NullPointerException at org.apache.hadoop.hbase.ipc.RpcServer$Listener.getA...
http://issues.apache.org/jira/browse/HBASE-13318    Author: Lars Hofhansl, 2015-10-25, 04:34
[HBASE-14613] Remove MemStoreChunkPool? - HBase - [issue]
...I just stumbled across MemStoreChunkPool. The idea behind is to reuse chunks of allocations rather than letting the GC handle this.Now, it's off by default, and it seems to me to be of dubio...
http://issues.apache.org/jira/browse/HBASE-14613    Author: Lars Hofhansl, 2015-10-24, 05:06
[HBASE-14657] Remove unneeded API from EncodedSeeker - HBase - [issue]
...See parent. We do not need getKeyValueBuffer. It's only used for tests, and parent patch fixes all tests to use getKeyValue instead....
http://issues.apache.org/jira/browse/HBASE-14657    Author: Lars Hofhansl, 2015-10-24, 04:54
[HBASE-14628] [0.98] Save object creation for scanning with block encodings - HBase - [issue]
...I noticed that (at least in 0.98 - master is entirely different) we create ByteBuffer just to create a byte[], which is then used to create a KeyValue.We can save the creation of the ByteBuf...
http://issues.apache.org/jira/browse/HBASE-14628    Author: Lars Hofhansl, 2015-10-22, 21:55
[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, 2015-10-11, 19:43
[HBASE-14549] Simplify scanner stack reset logic - HBase - [issue]
...Looking at the code, I find that the logic is unnecessarily complex.We indicate in updateReaders that the scanner stack needs to be reset. Then almost all store scanner (and derived classes)...
http://issues.apache.org/jira/browse/HBASE-14549    Author: Lars Hofhansl, 2015-10-10, 06:31
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elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB