Major Description
FilterAllFilter is a filter in hbase-server's test packages used by PerformanceEvaluation to filter all results at the server when given the --filterAll command line argument. There is an unfortunate bug in versions greater than 0.94 (where I rewrote this filter and didn't notice the issue in later versions at the time):
@Override public ReturnCode filterKeyValue(Cell v) throws IOException { return ReturnCode.INCLUDE; }
This is obviously wrong, and results in the creation of KeyValue objects that we will almost immediately throw away when processing filterRow for backwards compatibility, which FilterAllFilter implements as:
@Override public boolean filterRow() throws IOException { return true; }
We noticed this problem when comparing object allocations during RPC processing between 0.94 and 0.98.