HBASE-19756 Master NPE during completed failed proc eviction

Signed-off-by: Andrew Purtell <apurtell@apache.org>

hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/ProcedureExecutor.java

@@ -217,20 +217,22 @@ public class ProcedureExecutor<TEnvironment> {
 
         // TODO: Select TTL based on Procedure type
         if (retainer.isExpired(now, evictTtl, evictAckTtl)) {
-          if (debugEnabled) {
+          // Failed procedures aren't persisted in WAL.
-            LOG.debug("Evict completed " + proc);
+          if (!(proc instanceof FailedProcedure)) {
-          }
             batchIds[batchCount++] = entry.getKey();
             if (batchCount == batchIds.length) {
               store.delete(batchIds, 0, batchCount);
               batchCount = 0;
             }
-          it.remove();
+          }
-
           final NonceKey nonceKey = proc.getNonceKey();
           if (nonceKey != null) {
             nonceKeysToProcIdsMap.remove(nonceKey);
           }
+          it.remove();
+          if (debugEnabled) {
+            LOG.debug("Evict completed " + proc);
+          }
         }
       }
       if (batchCount > 0) {

hbase-server/src/test/java/org/apache/hadoop/hbase/procedure/TestFailedProcCleanup.java

@@ -0,0 +1,110 @@
+/*
+ * 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.hbase.procedure;
+
+import static org.junit.Assert.fail;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Optional;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.client.RegionInfo;
+import org.apache.hadoop.hbase.client.TableDescriptor;
+import org.apache.hadoop.hbase.coprocessor.CoprocessorHost;
+import org.apache.hadoop.hbase.coprocessor.MasterCoprocessor;
+import org.apache.hadoop.hbase.coprocessor.MasterCoprocessorEnvironment;
+import org.apache.hadoop.hbase.coprocessor.MasterObserver;
+import org.apache.hadoop.hbase.coprocessor.ObserverContext;
+import org.apache.hadoop.hbase.procedure2.Procedure;
+import org.apache.hadoop.hbase.security.AccessDeniedException;
+import org.apache.hadoop.hbase.shaded.protobuf.generated.ProcedureProtos;
+import org.apache.hadoop.hbase.testclassification.MediumTests;
+import org.apache.hadoop.hbase.util.Bytes;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+/**
+ * Check if CompletedProcedureCleaner cleans up failed nonce procedures.
+ */
+@Category(MediumTests.class)
+public class TestFailedProcCleanup {
+  private static final Log LOG = LogFactory.getLog(TestFailedProcCleanup.class);
+
+  protected static HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
+  private static final TableName TABLE = TableName.valueOf("test");
+  private static final byte[] FAMILY = Bytes.toBytesBinary("f");
+  private static final int evictionDelay = 10 * 1000;
+
+  @BeforeClass
+  public static void setUpBeforeClass() throws Exception {
+    Configuration conf = TEST_UTIL.getConfiguration();
+    conf.setInt("hbase.procedure.cleaner.evict.ttl", evictionDelay);
+    conf.setInt("hbase.procedure.cleaner.evict.batch.size", 1);
+    conf.set(CoprocessorHost.MASTER_COPROCESSOR_CONF_KEY, CreateFailObserver.class.getName());
+    TEST_UTIL.startMiniCluster(3);
+  }
+
+  @AfterClass
+  public static void tearDownAfterClass() throws Exception {
+    TEST_UTIL.cleanupTestDir();
+    TEST_UTIL.cleanupDataTestDirOnTestFS();
+    TEST_UTIL.shutdownMiniCluster();
+  }
+
+  @Test
+  public void testFailCreateTable() throws Exception {
+    try {
+      TEST_UTIL.createTable(TABLE, FAMILY);
+      fail("Table shouldn't be created");
+    } catch (AccessDeniedException e) {
+      LOG.debug("Ignoring exception: ", e);
+      Thread.sleep(evictionDelay * 3);
+    }
+    List<Procedure<?>> procedureInfos =
+        TEST_UTIL.getMiniHBaseCluster().getMaster().getMasterProcedureExecutor().getProcedures();
+    for (Procedure procedureInfo : procedureInfos) {
+      if (procedureInfo.getProcName().equals("CreateTableProcedure")
+          && procedureInfo.getState() == ProcedureProtos.ProcedureState.ROLLEDBACK) {
+        fail("Found procedure " + procedureInfo + " that hasn't been cleaned up");
+      }
+    }
+  }
+
+  public static class CreateFailObserver implements MasterCoprocessor, MasterObserver {
+
+    @Override
+    public void preCreateTable(ObserverContext<MasterCoprocessorEnvironment> env,
+        TableDescriptor desc, RegionInfo[] regions) throws IOException {
+
+      if (desc.getTableName().equals(TABLE)) {
+        throw new AccessDeniedException("Don't allow creation of table");
+      }
+    }
+
+    @Override
+    public Optional<MasterObserver> getMasterObserver() {
+      return Optional.of(this);
+    }
+  }
+}