org.apache.hadoop.hbase.master.RetryableMetaOperation.java Source code

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Here is the source code for org.apache.hadoop.hbase.master.RetryableMetaOperation.java

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/**
 * Copyright 2010 The Apache Software Foundation
 *
 * 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;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.RemoteExceptionHandler;
import org.apache.hadoop.hbase.TableNotDisabledException;
import org.apache.hadoop.hbase.TableNotFoundException;
import org.apache.hadoop.hbase.ipc.HRegionInterface;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.Sleeper;
import org.apache.hadoop.ipc.RemoteException;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;

/**
 * Uses Callable pattern so that operations against meta regions do not need
 * to duplicate retry logic.
 */
abstract class RetryableMetaOperation<T> implements Callable<T> {
    protected final Log LOG = LogFactory.getLog(this.getClass());
    protected final Sleeper sleeper;
    protected final MetaRegion m;
    protected final HMaster master;

    protected HRegionInterface server;

    protected RetryableMetaOperation(MetaRegion m, HMaster master) {
        this.m = m;
        this.master = master;
        this.sleeper = new Sleeper(this.master.getThreadWakeFrequency(), master.getStopper());
    }

    protected T doWithRetries() throws IOException, RuntimeException {
        List<IOException> exceptions = new ArrayList<IOException>();
        for (int tries = 0; tries < this.master.getNumRetries(); tries++) {
            if (this.master.isClosed()) {
                return null;
            }
            try {
                this.server = this.master.getServerConnection().getHRegionConnection(m.getServer());
                return this.call();
            } catch (IOException e) {
                if (e instanceof TableNotFoundException || e instanceof TableNotDisabledException
                        || e instanceof InvalidColumnNameException) {
                    throw e;
                }
                if (e instanceof RemoteException) {
                    e = RemoteExceptionHandler.decodeRemoteException((RemoteException) e);
                }
                if (tries == this.master.getNumRetries() - 1) {
                    if (LOG.isDebugEnabled()) {
                        StringBuilder message = new StringBuilder("Trying to contact region server for regionName '"
                                + Bytes.toString(m.getRegionName()) + "', but failed after " + (tries + 1)
                                + " attempts.\n");
                        int i = 1;
                        for (IOException e2 : exceptions) {
                            message.append("Exception " + i + ":\n" + e2);
                        }
                        LOG.debug(message);
                    }
                    this.master.checkFileSystem(false);
                    throw e;
                }
                if (LOG.isDebugEnabled()) {
                    exceptions.add(e);
                }
            } catch (Exception e) {
                LOG.debug("Exception in RetryableMetaOperation: ", e);
                throw new RuntimeException(e);
            }
            this.sleeper.sleep();
        }
        return null;
    }
}