Anoop Sam John
Stephen Yuan Jiang
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[HBASE-17440] [0.98] Make sure DelayedClosing chore is stopped as soon as an HConnection is closed
...We're seeing many issue with run-away ZK client connection in long running app servers. 10k or more send or event threads are happening frequently.While I looked around in the code I noticed...
, 2017-01-10, 17:20
[HBASE-10247] Client promises about timestamps
...This is to start a discussion about timestamp promises declared per table of CF.For example if a client promises only monotonically increasing timestamps (or no custom set timestamps) and VE...
, 2016-12-28, 19:04
[HBASE-16765] New SteppingRegionSplitPolicy, avoid too aggressive spread of regions for small tables.
...We just did some experiments on some larger clusters and found that while using IncreasingToUpperBoundRegionSplitPolicy generally works well and is very convenient, it does tend to produce t...
, 2016-12-18, 21:03
[HBASE-13094] Consider Filters that are evaluated before deletes and see delete markers
...That would be good for full control filtering of all cells, such as needed for some transaction implementations.Gary Helmling...
, 2016-12-18, 01:12
[HBASE-16115] Missing security context in RegionObserver coprocessor when a compaction/split is triggered manually
...We ran into an interesting phenomenon which can easily render a cluster unusable.We loaded some tests data into a test table and forced a manual compaction through the UI. We have some compa...
, 2016-12-12, 18:45
[HBASE-9272] A parallel, unordered scanner
...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...
, 2016-12-09, 08:08
[HBASE-14613] Remove MemStoreChunkPool?
...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...
, 2016-10-07, 04:26
[HBASE-7010] PrefixFilter should seek to first matching row
...Currently a PrefixFilter will happily scan all KVs < prefix.If should seek forward to the prefix if the current KV < prefix....
, 2016-07-28, 05:31
[HBASE-15453] [Performance] Considering reverting HBASE-10015 - reinstate synchronized in StoreScanner
...In HBASE-10015 back then I found that intrinsic locks (synchronized) in StoreScanner are slower that explicit locks.I was surprised by this. To make sure I added a simple perf test and many ...
, 2016-07-18, 21:31
[HBASE-14549] Simplify scanner stack reset logic
...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)...
, 2016-07-18, 21:30
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