Apache HBase 0.94 is now released by Himanshu Vashishtha.
Some of the new features:
- More powerful first aid box: The previous HBck tool did a good job of fixing inconsistencies related to region assignments but lacked some basic features like fixing orphaned regions, region holes, overlapping regions, etc. HBASE-5128: “Uber hbck”, adds these missing features to the first aid box.
- Simplified Region Sizing: Deciding a region size is always tricky as it varies on a number of dynamic parameters such as data size, cluster size, workload, etc. HBASE-4365: “Heuristic for Region size” adds a heuristic where it increases the split size threshold of a table region as the data grows, thus limiting the number of region splits.
- Smarter transaction semantics: Though HBase supports single row level transaction, if there are a number of updates (Puts/Deletes) to an individual row, it will lock the row for each of these operations. HBASE-3584: “Atomic Put & Delete in a single transaction” enhances the HBase single row locking semantics by allowing Puts and Deletes on a row to be executed in a single call. This feature is on by default.
BTW, also from the post:
Apache HBase 0.94.0 has been released! This is the first major release since the January 22nd HBase 0.92 release. In the HBase 0.94.0 release the main focuses were on performance enhancements and the addition of new features (Also, several major bug fixes).
Less than four (4) months as I count it between HBase 0.92 and 0.94.
Sounds like a lot of people have been working very hard.
And making serious progress.