Added NoOpLogCloser for filesystems that don't support lease recovery

server/base/src/main/java/org/apache/accumulo/server/manager/recovery/NoOpLogCloser.java

@@ -0,0 +1,47 @@
+/*
+ * 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
+ *
+ *   https://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.accumulo.server.manager.recovery;
+
+import java.io.IOException;
+
+import org.apache.accumulo.core.conf.AccumuloConfiguration;
+import org.apache.accumulo.core.conf.Property;
+import org.apache.accumulo.server.fs.VolumeManager;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
+
+/**
+ * {@link HadoopLogCloser} recovers leases in DistributedFileSystem implementations and does nothing
+ * in local FileSystem implementations. For other implementations {@link HadoopLogCloser} throws an
+ * exception. However, Accumulo could be used with other Hadoop compatible FileSystem
+ * implementations that do not support lease recovery and we should not throw an exception in this
+ * case. This LogCloser implementation supports that case.
+ *
+ * To use this class, set the Property {@link Property#MANAGER_WAL_CLOSER_IMPLEMENTATION} to the
+ * full name of this class.
+ */
+public class NoOpLogCloser implements LogCloser {
+
+  @Override
+  public long close(AccumuloConfiguration conf, Configuration hadoopConf, VolumeManager fs,
+      Path path) throws IOException {
+    return 0;
+  }
+
+}