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[HBASE-7347] Allow multiple readers per storefile
...Currently each store file is read only through the single reader regardless of how many concurrent read requests access that file.This issue is to explore alternate designs....
, 2013-12-08, 02:01
[HBASE-6476] Replace all occurrances of System.currentTimeMillis() with EnvironmentEdge equivalent
...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...
, 2013-12-08, 01:37
[HBASE-9553] Pad HFile blocks to a fixed size before placing them into the blockcache
...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...
, 2013-12-08, 01:36
[HBASE-9840] Large scans and BlockCache evictions problems
...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...
, 2013-12-03, 21:31
[HBASE-10060] Unsynchronized scanning
...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...
, 2013-12-01, 09:03
[HBASE-9915] Performance: isSeeked() in EncodedScannerV2 always returns false
...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...
, 2013-11-30, 03:11
[HBASE-5954] Allow proper fsync support for HBase
...At least get recommendation into 0.96 doc and some numbers running w/ this hdfs feature enabled....
, 2013-11-29, 05:35
[HBASE-7141] Cleanup Increment and Append issues
...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...
, 2013-11-27, 23:35
[HBASE-10015] Replace intrinsic locking with explicit locks in StoreScanner
...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...
, 2013-11-27, 21:42
[HBASE-9956] Remove keyLength cache from KeyValue
...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...
, 2013-11-26, 05:53
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