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[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
[HBASE-8229] Replication code logs like crazy if a target table cannot be found. - HBase - [issue]
...One of our RS/DN machines ran out of diskspace on the partition to which we write the log files.It turns out we still had a table in our source cluster with REPLICATION_SCOPE=>1 that did ...
http://issues.apache.org/jira/browse/HBASE-8229    Author: Lars Hofhansl, 2013-04-17, 19:33
[HBASE-4210] Allow coprocessor to interact with batches per region sent from a client - HBase - [issue]
...Currently the coprocessor write hooks - {pre|post}{Put|Delete} - are strictly one row|cell operations.It might be a good idea to allow a coprocessor to deal with batches of puts and del...
http://issues.apache.org/jira/browse/HBASE-4210    Author: Lars Hofhansl, 2013-04-16, 04:47
[HBASE-7255] KV size metric went missing from StoreScanner. - HBase - [issue]
...In trunk due to the metric refactor, at least the KV size metric went missing.See this code in StoreScanner.java:    } finally {      if (cumulativeMetric ...
http://issues.apache.org/jira/browse/HBASE-7255    Author: Lars Hofhansl, 2013-04-13, 04:07
[HBASE-8316] JoinedHeap for non essential column families should reseek instead of seek - HBase - [issue]
...This was raised by the Phoenix team. During a profiling session we noticed that catching the joinedHeap up to the current rows via seek causes a performance regression, which makes the joine...
http://issues.apache.org/jira/browse/HBASE-8316    Author: Lars Hofhansl, 2013-04-12, 05:15
Re: Essential column family performance - HBase - [mail # user]
...Also the unittest tests with only 10000 rows that would all fit in the memstore. Seek vs reseek should make little difference for the memstore.  We tested with 1m and 10m rows, and flus...
   Author: Lars Hofhansl, 2013-04-10, 01:17
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