Addition. Only random-reads become very slow, scans and sequential-reads are ok.
On Tue, Aug 18, 2009 at 6:02 PM, Schubert Zhang <[email protected]> wrote: > 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 >> > >
