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[HBASE-7336] HFileBlock.readAtOffset does not work well with multiple threads - HBase - [issue]
...HBase grinds to a halt when many threads scan along the same set of blocks and neither read short circuit is nor block caching is enabled for the dfs client ... disabling the block cache mak...
http://issues.apache.org/jira/browse/HBASE-7336    Author: Lars Hofhansl, 2014-07-25, 21:09
[HBASE-9005] Improve documentation around KEEP_DELETED_CELLS, time range scans, and delete markers - HBase - [issue]
...Without KEEP_DELETED_CELLS all timerange queries are broken if their range covers a delete marker.As some internal discussions with colleagues showed, this feature is not well understand and...
http://issues.apache.org/jira/browse/HBASE-9005    Author: Lars Hofhansl, 2014-07-08, 00:35
[HBASE-7320] Remove KeyValue.getBuffer() - HBase - [issue]
...In many places this is simple task of just replacing the method name.There, however, quite a few places where we assume that: the entire KV is backed by a single byte array the KVs key porti...
http://issues.apache.org/jira/browse/HBASE-7320    Author: Lars Hofhansl, 2014-06-28, 06:12
[HBASE-9272] A parallel, unordered scanner - HBase - [issue]
...The contract of ClientScanner is to return rows in sort order. That limits the order in which region can be scanned.I propose a simple ParallelScanner that does not have this requirement and...
http://issues.apache.org/jira/browse/HBASE-9272    Author: Lars Hofhansl, 2014-06-23, 12:42
[HBASE-11351] Experiments with OffHeap memstores - HBase - [issue]
...I have been experimenting with offheap memstores using an offheap BTree implementation of ConcurrentMap provided by MapDB (www.mapdb.org)So far I hooked this up in an experimental way with i...
http://issues.apache.org/jira/browse/HBASE-11351    Author: Lars Hofhansl, 2014-06-15, 04:58
[HBASE-8362] Possible MultiGet optimization - HBase - [issue]
...Currently MultiGets are executed on a RegionServer in a single thread in a loop that handles each Get separately (opening a scanner, seeking, etc).It seems we could optimize this (per region...
http://issues.apache.org/jira/browse/HBASE-8362    Author: Lars Hofhansl, 2014-06-13, 17:16
[HBASE-11143] Improve replication metrics - HBase - [issue]
...We are trying to report on replication lag and find that there is no good single metric to do that.ageOfLastShippedOp is close, but unfortunately it is increased even when there is nothing t...
http://issues.apache.org/jira/browse/HBASE-11143    Author: Lars Hofhansl, 2014-06-11, 03:53
[HBASE-10936] Add zeroByte encoding test - HBase - [issue]
http://issues.apache.org/jira/browse/HBASE-10936    Author: Lars Hofhansl, 2014-06-11, 03:53
[HBASE-11247] [0.94] update maven-site-plugin to 3.3 - HBase - [issue]
...With maven version 3.1 or newer the site target fails unless the site plugin is updated to and master have this already, this updates the site plugin from 3.2 to 3.3.Verified on my ...
http://issues.apache.org/jira/browse/HBASE-11247    Author: Lars Hofhansl, 2014-06-11, 03:53
[HBASE-4844] Coprocessor hooks for log rolling - HBase - [issue]
...In order to eventually do point in time recovery we need a way to reliably back up the logs. Rather than adding some hard coded changes, we can provide coprocessor hooks and folks can implem...
http://issues.apache.org/jira/browse/HBASE-4844    Author: Lars Hofhansl, 2014-06-02, 23:45
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