diff --git hbase-server/src/main/java/org/apache/hadoop/hbase/master/handler/CreateTableHandler.java hbase-server/src/main/java/org/apache/hadoop/hbase/master/handler/CreateTableHandler.java index 8dc7cb5..24d8c71 100644 --- hbase-server/src/main/java/org/apache/hadoop/hbase/master/handler/CreateTableHandler.java +++ hbase-server/src/main/java/org/apache/hadoop/hbase/master/handler/CreateTableHandler.java @@ -128,7 +128,12 @@ public class CreateTableHandler extends EventHandler { // createTable isn't a frequent operation, that should be ok. //TODO: now that we have table locks, re-evaluate above try { - if (!this.assignmentManager.getZKTable().checkAndSetEnablingTable(tableName)) { + // During master initialization, the ZK state could be inconsistent from failed DDL + // in the past. If we fail here, it would prevent master to start. We should force + // setting the system table state regardless the table state. + if (!((HMaster) this.server).isInitialized() && tableName.isSystemTable()) { + this.assignmentManager.getZKTable().setEnablingTable(tableName); + } else if (!this.assignmentManager.getZKTable().checkAndSetEnablingTable(tableName)) { throw new TableExistsException(tableName); } } catch (KeeperException e) { diff --git hbase-server/src/test/java/org/apache/hadoop/hbase/master/handler/TestCreateTableHandler2.java hbase-server/src/test/java/org/apache/hadoop/hbase/master/handler/TestCreateTableHandler2.java new file mode 100644 index 0000000..2d360d9 --- /dev/null +++ hbase-server/src/test/java/org/apache/hadoop/hbase/master/handler/TestCreateTableHandler2.java @@ -0,0 +1,68 @@ +/** + * + * 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.master.handler; + +import static org.junit.Assert.assertTrue; + +import org.apache.commons.logging.Log; +import org.apache.commons.logging.LogFactory; +import org.apache.hadoop.hbase.HBaseTestingUtility; +import org.apache.hadoop.hbase.testclassification.MediumTests; +import org.apache.hadoop.hbase.TableName; +import org.apache.hadoop.hbase.protobuf.ProtobufUtil; +import org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos; +import org.apache.hadoop.hbase.zookeeper.MiniZooKeeperCluster; +import org.apache.hadoop.hbase.zookeeper.ZKUtil; +import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher; +import org.junit.After; +import org.junit.Test; +import org.junit.experimental.categories.Category; + +@Category(MediumTests.class) +public class TestCreateTableHandler2 { + private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility(); + private static final Log LOG = LogFactory.getLog(TestCreateTableHandler2.class); + + @After + public void tearDown() throws Exception { + TEST_UTIL.shutdownMiniCluster(); + TEST_UTIL.shutdownMiniZKCluster(); + } + + @Test + public void testMasterRestartAfterNameSpaceEnablingNodeIsCreated() throws Exception { + // Step 1: start mini zk cluster. + MiniZooKeeperCluster zkCluster; + zkCluster = TEST_UTIL.startMiniZKCluster(); + // Step 2: add an orphaned system table ZNODE + TableName tableName = TableName.valueOf("hbase:namespace"); + ZooKeeperWatcher zkw = TEST_UTIL.getZooKeeperWatcher(); + String znode = ZKUtil.joinZNode(zkw.tableZNode, tableName.getNameAsString()); + ZooKeeperProtos.Table.Builder builder = ZooKeeperProtos.Table.newBuilder(); + builder.setState(ZooKeeperProtos.Table.State.ENABLED); + byte [] data = ProtobufUtil.prependPBMagic(builder.build().toByteArray()); + ZKUtil.createSetData(zkw, znode, data); + LOG.info("Create an orphaned Znode " + znode + " with data " + data); + // Step 3: link the zk cluster to hbase cluster + TEST_UTIL.setZkCluster(zkCluster); + // Step 4: start hbase cluster and expect master to start successfully. + TEST_UTIL.startMiniCluster(); + assertTrue(TEST_UTIL.getHBaseCluster().getLiveMasterThreads().size() == 1); + } +}