If KVs are in memstore, small batch get can come across MultiActionResultTooLarge

to protect against big scan, we set   hbase.server.scanner.max.result.size  = 10MB in our customer  hbase cluster,  however our clients  can meet MultiActionResultTooLarge even in small batch get (for ex. 15 batch get,  and row size is about 5KB ) .

after  HBASE-14978 hbase take the data block reference into consideration, but the  block size is 64KB (the default value ), even if all cells are from different block , the block size retained is less than 1MB, so what's the problem ?

finally  i found that HBASE-14978 also consider the cell in memstore, as MSLAB is enabled default, so if the cell is from memstore, cell backend array can be large (2MB as default), so even if a small batch can meet this error,  is this reasonable ?

plus:

when throw MultiActionResultTooLarge exception,  hbase client should retry ignore rpc retry num,  however  if set retry num to zero, client  will fail without retry in this case.

see attachment  TestMultiRespectsLimitsMemstore  for details.