[20/50] [abbrv] hive git commit: HIVE-10302 Load small tables (for map join) in executor memory only once [Spark Branch] (added new file missed in rebasing)

[ga...@apache.org]

HIVE-10302 Load small tables (for map join) in executor memory only once [Spark Branch] (added new file missed in rebasing)


Project: http://git-wip-us.apache.org/repos/asf/hive/repo
Commit: http://git-wip-us.apache.org/repos/asf/hive/commit/9bc8ea2a
Tree: http://git-wip-us.apache.org/repos/asf/hive/tree/9bc8ea2a
Diff: http://git-wip-us.apache.org/repos/asf/hive/diff/9bc8ea2a

Branch: refs/heads/hbase-metastore
Commit: 9bc8ea2ae25e2ef766604068ac143eeeaa376929
Parents: 3817bb5
Author: Jimmy Xiang <jx...@cloudera.com>
Authored: Mon Jun 1 15:59:32 2015 -0700
Committer: Jimmy Xiang <jx...@cloudera.com>
Committed: Mon Jun 1 15:59:32 2015 -0700

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 .../hive/ql/exec/spark/SmallTableCache.java     | 73 ++++++++++++++++++++
 1 file changed, 73 insertions(+)
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http://git-wip-us.apache.org/repos/asf/hive/blob/9bc8ea2a/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SmallTableCache.java
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diff --git a/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SmallTableCache.java b/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SmallTableCache.java
new file mode 100644
index 0000000..1992d16
--- /dev/null
+++ b/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SmallTableCache.java
@@ -0,0 +1,73 @@
+/**
+ * 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.hadoop.hive.ql.exec.spark;
+
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hive.conf.HiveConf;
+import org.apache.hadoop.hive.ql.exec.persistence.MapJoinTableContainer;
+
+public class SmallTableCache {
+  private static final Log LOG = LogFactory.getLog(SmallTableCache.class.getName());
+
+  private static final ConcurrentHashMap<Path, MapJoinTableContainer>
+    tableContainerMap = new ConcurrentHashMap<Path, MapJoinTableContainer>();
+  private static volatile String queryId;
+
+  /**
+   * Check if this is a new query. If so, clean up the cache
+   * that is for the previous query, and reset the current query id.
+   */
+  public static void initialize(Configuration conf) {
+    String currentQueryId = conf.get(HiveConf.ConfVars.HIVEQUERYID.varname);
+    if (!currentQueryId.equals(queryId)) {
+      if (!tableContainerMap.isEmpty()) {
+        synchronized (tableContainerMap) {
+          if (!currentQueryId.equals(queryId) && !tableContainerMap.isEmpty()) {
+            for (MapJoinTableContainer tableContainer: tableContainerMap.values()) {
+              tableContainer.clear();
+            }
+            tableContainerMap.clear();
+            if (LOG.isDebugEnabled()) {
+              LOG.debug("Cleaned up small table cache for query " + queryId);
+            }
+          }
+        }
+      }
+      queryId = currentQueryId;
+    }
+  }
+
+  public static void cache(Path path, MapJoinTableContainer tableContainer) {
+    if (tableContainerMap.putIfAbsent(path, tableContainer) == null && LOG.isDebugEnabled()) {
+      LOG.debug("Cached small table file " + path + " for query " + queryId);
+    }
+  }
+
+  public static MapJoinTableContainer get(Path path) {
+    MapJoinTableContainer tableContainer = tableContainerMap.get(path);
+    if (tableContainer != null && LOG.isDebugEnabled()) {
+      LOG.debug("Loaded small table file " + path + " from cache for query " + queryId);
+    }
+    return tableContainer;
+  }
+}