Hi folks, We are facing “IllegalStateException: requestSeek cannot be called on ReversedKeyValueHeap" when using a reverse scan and the loadColumnFamiliesOnDemand optimization is enabled. As ReversedKeyValueHeap doesn't support requestSeek, it seems like the IllegalStateException occurs. I have already filed this issue to HBASE-20219, please see it for the details.
I tried to add a server-side check to forbid such scans, but as James mentioned in the Jira, this would have negative implications on performance. I think the best solution is to make ReversedKeyValueHeap support seek if we can. What do you guys think about the feasibility of this? Thanks, Toshihiro Suzuki
