Github user joshelser commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/244#discussion_r112591981
--- 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 --
> We used to have a separate SynchronizedIterator on scan scope that
wrapped all of the system iterators and this moves that same functionality down
into the VisibilityFilter.
Ok, we def need to lift your great explanation into some source code
comments :)
> This is only necessary when a configurable iterator does something
multi-threaded.
Ah yes. IMO, we should just tell people "don't do that" and move on, but
that's an issue for another day :P
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