In another mail thread Zheng Hu brought up an important Jra fix https://issues.apache.org/jira/browse/HBASE-21657 Can u pls check with this once?
Anoop On Tue, Jun 9, 2020 at 8:08 PM Jan Van Besien <[email protected]> wrote: > On Sun, Jun 7, 2020 at 7:49 AM Anoop John <[email protected]> wrote: > > As per the above configs, it looks like Bucket Cache is not being used. > > Only on heap LRU cache in use. > > True (but it is large enough to hold everything, so I don't think it > matters). > > > @Jan - Is it possible for you to test with off heap Bucket Cache? > Config > > bucket cache off heap mode with size ~7.5 GB > > I did a quick test but it seems not to make a measurable difference. > If anything, it is actually slightly slower even. I see 100% hit ratio > in the L1 > LruBlockCache and effectively also 100% in the L2 BucketCache (hit > ratio is not yet at 100% but hits increase with every test and misses > do not). > > Given that the LruBlockCache was already large enough to cache all the > data anyway, I did not expect this to help either, to be honest. > > > Do you have any DataBlockEncoding enabled on the CF? > > Yes, FAST_DIFF. But this is of course true in both the tests with > hbase2 and hbase1. > > Jan >
