Github user keith-turner commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/256#discussion_r115359875
--- Diff:
core/src/main/java/org/apache/accumulo/core/file/blockfile/cache/lru/LruBlockCacheConfiguration.java
---
@@ -0,0 +1,122 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.accumulo.core.file.blockfile.cache.lru;
+
+import java.util.Map;
+
+import org.apache.accumulo.core.conf.AccumuloConfiguration;
+import org.apache.accumulo.core.conf.Property;
+import
org.apache.accumulo.core.file.blockfile.cache.BlockCacheConfiguration;
+
+public final class LruBlockCacheConfiguration extends
BlockCacheConfiguration {
+
+ /** Default Configuration Parameters */
+
+ /** Backing Concurrent Map Configuration */
+ public static final Float DEFAULT_LOAD_FACTOR = 0.75f;
+ public static final Integer DEFAULT_CONCURRENCY_LEVEL = 16;
+
+ /** Eviction thresholds */
+ public static final Float DEFAULT_MIN_FACTOR = 0.75f;
+ public static final Float DEFAULT_ACCEPTABLE_FACTOR = 0.85f;
+
+ /** Priority buckets */
+ public static final Float DEFAULT_SINGLE_FACTOR = 0.25f;
+ public static final Float DEFAULT_MULTI_FACTOR = 0.50f;
+ public static final Float DEFAULT_MEMORY_FACTOR = 0.25f;
+
+ // property names
+ private static final String PREFIX =
Property.GENERAL_ARBITRARY_PROP_PREFIX + "cache.block.lru.";
--- End diff --
The `getOrDefault(CacheType ct, String key, T default)` method could fall
back to calling `getOrDefault(String key, T default)` in the case where nothing
is set for the specific cache type.
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