org.apache.accumulo.server.util.TabletOperations.java Source code

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Here is the source code for org.apache.accumulo.server.util.TabletOperations.java

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/*
 * 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.accumulo.server.util;

import java.io.IOException;
import java.net.UnknownHostException;

import org.apache.accumulo.core.Constants;
import org.apache.accumulo.core.util.UtilWaitThread;
import org.apache.accumulo.server.ServerConstants;
import org.apache.accumulo.server.fs.VolumeManager;
import org.apache.accumulo.server.fs.VolumeManagerImpl;
import org.apache.hadoop.fs.FileSystem;
import org.apache.accumulo.server.tablets.UniqueNameAllocator;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.log4j.Logger;

public class TabletOperations {

    private static final Logger log = Logger.getLogger(TabletOperations.class);

    public static String createTabletDirectory(VolumeManager fs, String tableId, Text endRow) {
        String lowDirectory;

        UniqueNameAllocator namer = UniqueNameAllocator.getInstance();
        String volume = fs.choose(ServerConstants.getTablesDirs());

        while (true) {
            try {
                if (endRow == null) {
                    lowDirectory = Constants.DEFAULT_TABLET_LOCATION;
                    Path lowDirectoryPath = new Path(volume + "/" + tableId + "/" + lowDirectory);
                    if (fs.exists(lowDirectoryPath) || fs.mkdirs(lowDirectoryPath)) {
                        FileSystem pathFs = fs.getVolumeByPath(lowDirectoryPath).getFileSystem();
                        return lowDirectoryPath.makeQualified(pathFs.getUri(), pathFs.getWorkingDirectory())
                                .toString();
                    }
                    log.warn("Failed to create " + lowDirectoryPath + " for unknown reason");
                } else {
                    lowDirectory = "/" + Constants.GENERATED_TABLET_DIRECTORY_PREFIX + namer.getNextName();
                    Path lowDirectoryPath = new Path(volume + "/" + tableId + "/" + lowDirectory);
                    if (fs.exists(lowDirectoryPath))
                        throw new IllegalStateException("Dir exist when it should not " + lowDirectoryPath);
                    if (fs.mkdirs(lowDirectoryPath)) {
                        FileSystem lowDirectoryFs = fs.getVolumeByPath(lowDirectoryPath).getFileSystem();
                        return lowDirectoryPath
                                .makeQualified(lowDirectoryFs.getUri(), lowDirectoryFs.getWorkingDirectory())
                                .toString();
                    }
                }
            } catch (IOException e) {
                log.warn(e);
            }

            log.warn("Failed to create dir for tablet in table " + tableId + " in volume " + volume
                    + " + will retry ...");
            UtilWaitThread.sleep(3000);

        }
    }

    public static String createTabletDirectory(String tableDir, Text endRow) {
        while (true) {
            try {
                VolumeManager fs = VolumeManagerImpl.get();
                return createTabletDirectory(fs, tableDir, endRow);
            } catch (IOException e) {
                log.warn("problem creating tablet directory", e);
            } catch (IllegalArgumentException exception) {
                /* thrown in some edge cases of DNS failure by Hadoop instead of UnknownHostException */
                if (exception.getCause() instanceof UnknownHostException) {
                    log.warn("problem creating tablet directory", exception);
                } else {
                    throw exception;
                }
            }
            UtilWaitThread.sleep(3000);
        }
    }
}