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[HBASE-6476] Replace all occurrances of System.currentTimeMillis() with EnvironmentEdge equivalent - HBase - [issue]
...There are still some areas where System.currentTimeMillis() is used in HBase. In order to make all parts of the code base testable and (potentially) to be able to configure HBase's notion of...
http://issues.apache.org/jira/browse/HBASE-6476    Author: Lars Hofhansl, 2013-12-08, 01:37
[HBASE-9553] Pad HFile blocks to a fixed size before placing them into the blockcache - HBase - [issue]
...In order to make it easy on the garbage collector and to avoid full compaction phases we should make sure that all (or at least a large percentage) of the HFile blocks as cached in the block...
http://issues.apache.org/jira/browse/HBASE-9553    Author: Lars Hofhansl, 2013-12-08, 01:36
[HBASE-9840] Large scans and BlockCache evictions problems - HBase - [issue]
...I just ran into a scenario that baffled me first, but after some reflection makes sense. I ran a very large scan that filled up most of the block cache with my scan's data. I ran that scan a...
http://issues.apache.org/jira/browse/HBASE-9840    Author: Lars Hofhansl, 2013-12-03, 21:31
[HBASE-10060] Unsynchronized scanning - HBase - [issue]
...HBASE-10015 has some lengthy discussion. The solution there ended up replacing synchronized with ReentrantLock, which - somewhat surprisingly - yielded a non-trivial improvement for tall tab...
http://issues.apache.org/jira/browse/HBASE-10060    Author: Lars Hofhansl, 2013-12-01, 09:03
[HBASE-9915] Performance: isSeeked() in EncodedScannerV2 always returns false - HBase - [issue]
...While debugging why reseek is so slow I found that it is quite broken for encoded scanners.The problem is this:AbstractScannerV2.reseekTo(...) calls isSeeked() to check whether scanner was s...
http://issues.apache.org/jira/browse/HBASE-9915    Author: Lars Hofhansl, 2013-11-30, 03:11
[HBASE-5954] Allow proper fsync support for HBase - HBase - [issue]
...At least get recommendation into 0.96 doc and some numbers running w/ this hdfs feature enabled....
http://issues.apache.org/jira/browse/HBASE-5954    Author: Lars Hofhansl, 2013-11-29, 05:35
[HBASE-7141] Cleanup Increment and Append issues - HBase - [issue]
...Append and Increment should take a TS for their update phase Append should access a timerange for the read phase Increment should no longer implement Writable (in trunk) Increment and Append...
http://issues.apache.org/jira/browse/HBASE-7141    Author: Lars Hofhansl, 2013-11-27, 23:35
[HBASE-10015] Replace intrinsic locking with explicit locks in StoreScanner - HBase - [issue]
...Did some more profiling (this time with a sampling profiler) and StoreScanner.peek() showed up a lot in the samples. At first that was surprising, but peek is synchronized, so it seems a lot...
http://issues.apache.org/jira/browse/HBASE-10015    Author: Lars Hofhansl, 2013-11-27, 21:42
[HBASE-9956] Remove keyLength cache from KeyValue - HBase - [issue]
...See discussion in HBASE-9935. Currently KeyValue caches the keyLength in order to avoid decoding the key length in getKeyLength() repeatedly.Benchmarking outside of a profiler revealed no im...
http://issues.apache.org/jira/browse/HBASE-9956    Author: Lars Hofhansl, 2013-11-26, 05:53
[HBASE-9971] Port part of HBASE-9958 to 0.94 - change lock scope in locateRegion - HBase - [issue]
...Simple fix that we should have in 0.94 as well....
http://issues.apache.org/jira/browse/HBASE-9971    Author: Lars Hofhansl, 2013-11-26, 05:53
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