HBASE-17287 Master becomes a zombie if filesystem object closes

hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterWalManager.java

@@ -270,6 +270,11 @@ private List<Path> getLogDirs(final Set<ServerName> serverNames) throws IOExcept
         }
         logDirs.add(splitDir);
       }
+    } catch (IOException ioe) {
+      if (!checkFileSystem()) {
+        this.services.abort("Aborting due to filesystem unavailable", ioe);
+        throw ioe;
+      }
     } finally {
       if (needReleaseLock) {
         this.splitLogLock.unlock();

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

@@ -0,0 +1,125 @@
+/**
+ * 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.procedure;
+
+import static org.junit.Assert.assertTrue;
+
+import java.util.List;
+
+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.HRegionInfo;
+import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.Waiter;
+import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer;
+import org.apache.hadoop.hbase.procedure2.ProcedureExecutor;
+import org.apache.hadoop.hbase.procedure2.ProcedureTestingUtility;
+import org.apache.hadoop.hbase.testclassification.MediumTests;
+import org.apache.hadoop.hbase.util.Bytes;
+import org.apache.hadoop.hbase.util.JVMClusterUtil;
+import org.apache.hadoop.hbase.util.JVMClusterUtil.MasterThread;
+import org.apache.hadoop.hdfs.DistributedFileSystem;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.protocol.HdfsConstants;
+import org.junit.After;
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+@Category(MediumTests.class)
+public class TestSafemodeBringsDownMaster {
+  private static final Log LOG = LogFactory.getLog(TestSafemodeBringsDownMaster.class);
+
+  protected static final HBaseTestingUtility UTIL = new HBaseTestingUtility();
+
+  private static void setupConf(Configuration conf) {
+    conf.setInt(MasterProcedureConstants.MASTER_PROCEDURE_THREADS, 1);
+    conf.set(BaseLoadBalancer.TABLES_ON_MASTER, "none");
+  }
+
+  @BeforeClass
+  public static void setupCluster() throws Exception {
+    setupConf(UTIL.getConfiguration());
+    UTIL.startMiniCluster(1);
+  }
+
+  @AfterClass
+  public static void cleanupTest() throws Exception {
+    try {
+      UTIL.shutdownMiniCluster();
+    } catch (Exception e) {
+      LOG.warn("failure shutting down cluster", e);
+    }
+  }
+
+  @Before
+  public void setup() throws Exception {
+    resetProcExecutorTestingKillFlag();
+  }
+
+  private ProcedureExecutor<MasterProcedureEnv> getMasterProcedureExecutor() {
+    return UTIL.getHBaseCluster().getMaster().getMasterProcedureExecutor();
+  }
+  private void resetProcExecutorTestingKillFlag() {
+    final ProcedureExecutor<MasterProcedureEnv> procExec = getMasterProcedureExecutor();
+    ProcedureTestingUtility.setKillAndToggleBeforeStoreUpdate(procExec, false);
+    assertTrue("expected executor to be running", procExec.isRunning());
+  }
+
+  @After
+  public void tearDown() throws Exception {
+  }
+
+  @Test(timeout=60000)
+  public void testSafemodeBringsDownMaster() throws Exception {
+    final TableName tableName = TableName.valueOf("testSafemodeBringsDownMaster");
+    final byte[][] splitKeys = new byte[][] {
+      Bytes.toBytes("a"), Bytes.toBytes("b"), Bytes.toBytes("c")
+    };
+    HRegionInfo[] regions = MasterProcedureTestingUtility.createTable(
+        getMasterProcedureExecutor(), tableName, splitKeys, "f1", "f2");
+    MiniDFSCluster dfsCluster = UTIL.getDFSCluster();
+    DistributedFileSystem dfs = (DistributedFileSystem) dfsCluster.getFileSystem();
+    dfs.setSafeMode(HdfsConstants.SafeModeAction.SAFEMODE_ENTER);
+    final long timeOut = 180000;
+    long startTime = System.currentTimeMillis();
+    int index = -1;
+    do {
+      index = UTIL.getMiniHBaseCluster().getServerWithMeta();
+    } while (index == -1 &&
+      startTime + timeOut < System.currentTimeMillis());
+
+    if (index != -1){
+      UTIL.getMiniHBaseCluster().abortRegionServer(index);
+      UTIL.getMiniHBaseCluster().waitOnRegionServer(index);
+    }
+    UTIL.waitFor(timeOut, new Waiter.Predicate<Exception>() {
+      @Override
+      public boolean evaluate() throws Exception {
+        List<JVMClusterUtil.MasterThread> threads = UTIL.getMiniHBaseCluster().getLiveMasterThreads();
+        return threads == null || threads.isEmpty();
+      }
+    });
+    dfs.setSafeMode(HdfsConstants.SafeModeAction.SAFEMODE_LEAVE);
+  }
+}