stack and J-G, Thank you very much for your helpful comment. But now, we find such a critical issue for random reads. I use sequentical-writes to insert 5GB of data in our HBase table from empty, and ~30 regions are generated. Then the random-reads takes about 30 minutes to complete. And then, I run the sequentical-writes again. Thus, another version of each cell are inserted, thus ~60 regions are generated. But, we I ran the random-reads again to this table, it always take long time (more than 2 hours).
I check the heap usage and other metrics, does not find the reason. Bellow is the status of one region server: request=0.0, regions=13, stores=13, storefiles=14, storefileIndexSize=2, memstoreSize=0, usedHeap=1126, maxHeap=1991, blockCacheSize=338001080, blockCacheFree=79686056, blockCacheCount=5014, blockCacheHitRatio=55 Schubert On Tue, Aug 18, 2009 at 5:02 AM, Schubert Zhang <[email protected]> wrote: > We have just done a Performance Evaluation on HBase-0.20.0. > Refers to: > http://docloud.blogspot.com/2009/08/hbase-0200-performance-evaluation.html >
