Github user joshelser commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/244#discussion_r112496258
  
    --- Diff: 
core/src/main/java/org/apache/accumulo/core/iterators/system/VisibilityFilter.java
 ---
    @@ -16,63 +16,59 @@
      */
     package org.apache.accumulo.core.iterators.system;
     
    +import org.apache.accumulo.core.data.ArrayByteSequence;
    +import org.apache.accumulo.core.data.ByteSequence;
     import org.apache.accumulo.core.data.Key;
     import org.apache.accumulo.core.data.Value;
    -import org.apache.accumulo.core.iterators.Filter;
     import org.apache.accumulo.core.iterators.IteratorEnvironment;
     import org.apache.accumulo.core.iterators.SortedKeyValueIterator;
    +import org.apache.accumulo.core.iterators.SynchronizedServerFilter;
     import org.apache.accumulo.core.security.Authorizations;
     import org.apache.accumulo.core.security.ColumnVisibility;
     import org.apache.accumulo.core.security.VisibilityEvaluator;
     import org.apache.accumulo.core.security.VisibilityParseException;
     import org.apache.accumulo.core.util.BadArgumentException;
    -import org.apache.accumulo.core.util.TextUtil;
     import org.apache.commons.collections.map.LRUMap;
    -import org.apache.hadoop.io.Text;
     import org.slf4j.Logger;
     import org.slf4j.LoggerFactory;
     
    -public class VisibilityFilter extends Filter {
    +public class VisibilityFilter extends SynchronizedServerFilter {
    --- End diff --
    
    This looks to me that, for every call to this Filter we're now grabbing a 
lock?
    
    That sounds *really* bad to me. What's the reasoning here?


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