HAWQ-1622. Cache UGI objects and clean them periodically

Co-authored-by: Lav Jain <[email protected]> Co-authored-by: Ben Christel <[email protected]> Co-authored-by: Alex Denissov <[email protected]> Co-authored-by: Shivram Mani <[email protected]> Co-authored-by: Francisco Guerrero <[email protected]> Co-authored-by: Divya Bhargov <[email protected]>
huor · Jul 26, 2018 · 59133ea · 59133ea
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diff --git a/pxf/pxf-service/src/main/java/org/apache/hawq/pxf/service/SessionId.java b/pxf/pxf-service/src/main/java/org/apache/hawq/pxf/service/SessionId.java
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+package org.apache.hawq.pxf.service;
+
+/*
+ * 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.
+ */
+
+/**
+ * For the purposes of pxf-server, a session is the set of requests processed on a specific segment
+ * on behalf of a particular user and transaction. Grouping requests together into a session allows
+ * us to re-use the UserGroupInformation object (which is expensive to destroy) for each session.
+ * <p>
+ * SessionId is used as the cache key to look up the UserGroupInformation for a request. See {@link
+ * UGICache}.
+ */
+public class SessionId {
+
+    private final String user;
+    private final Integer segmentId;
+    private final String sessionId;
+
+    /**
+     * Create a sessionId
+     *
+     * @param segmentId     the calling segment
+     * @param transactionId the identifier for the transaction
+     * @param gpdbUser      the GPDB username
+     */
+    public SessionId(Integer segmentId, String transactionId, String gpdbUser) {
+        this.segmentId = segmentId;
+        this.user = gpdbUser;
+        this.sessionId = gpdbUser + ":" + transactionId + ":" + segmentId;
+    }
+
+    /**
+     * @return the segment id
+     */
+    public Integer getSegmentId() {
+        return segmentId;
+    }
+
+    /**
+     * @return the gpdb user name
+     */
+    public String getUser() {
+        return user;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public int hashCode() {
+        return sessionId.hashCode();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null) return false;
+        if (obj == this) return true;
+        if (obj.getClass() != getClass()) return false;
+
+        SessionId that = (SessionId) obj;
+        return this.sessionId.equals(that.sessionId);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public String toString() {
+        return "Session = " + sessionId;
+    }
+}