[GitHub] milleruntime commented on a change in pull request #364: ACCUMULO-4778 Initial feedback for table name to id mapping cache

[GitBox <gi...@apache.org>]

milleruntime commented on a change in pull request #364: ACCUMULO-4778 Initial feedback for table name to id mapping cache
URL: https://github.com/apache/accumulo/pull/364#discussion_r163623382
 
 

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 File path: core/src/main/java/org/apache/accumulo/core/client/impl/TableMap.java
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 @@ -0,0 +1,97 @@
+/*
+ * 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.client.impl;
+
+import static java.nio.charset.StandardCharsets.UTF_8;
+import static org.apache.accumulo.core.client.impl.Tables.getZooCache;
+import static org.apache.accumulo.core.client.impl.Tables.qualified;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.accumulo.core.Constants;
+import org.apache.accumulo.core.client.Instance;
+import org.apache.accumulo.core.client.NamespaceNotFoundException;
+import org.apache.accumulo.core.zookeeper.ZooUtil;
+import org.apache.accumulo.fate.zookeeper.ZooCache;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.collect.ImmutableMap;
+
+/**
+ * Used for thread safe caching of table ID maps
+ */
+public class TableMap {
+  private static final Logger log = LoggerFactory.getLogger(TableMap.class);
+
+  private Map<String,String> tableNameToIdMap;
+  private Map<String,String> tableIdtoNameMap;
+
+  public TableMap(Instance instance) {
+    generateMaps(instance);
 
 Review comment:
   Good call.

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