| /** |
| * |
| * 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.tool; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.hbase.HConstants; |
| import org.apache.hadoop.hbase.client.Mutation; |
| import org.apache.hadoop.hbase.coprocessor.BaseRegionObserver; |
| import org.apache.hadoop.hbase.coprocessor.ObserverContext; |
| import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment; |
| import org.apache.hadoop.hbase.regionserver.MiniBatchOperationInProgress; |
| import org.apache.hadoop.hbase.regionserver.OperationStatus; |
| |
| import java.io.IOException; |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| /** |
| * <p> |
| * This coprocessor 'shallows' all the writes. It allows to test a pure |
| * write workload, going through all the communication layers. |
| * The reads will work as well, but they as we never write, they will always always |
| * return an empty structure. The WAL is also skipped. |
| * Obviously, the region will never be split automatically. It's up to the user |
| * to split and move it. |
| * </p> |
| * <p> |
| * For a table created like this: |
| * create 'usertable', {NAME => 'f1', VERSIONS => 1} |
| * </p> |
| * <p> |
| * You can then add the coprocessor with this command: |
| * alter 'usertable', 'coprocessor' => '|org.apache.hadoop.hbase.tool.WriteSinkCoprocessor|' |
| * </p> |
| * <p> |
| * And then |
| * put 'usertable', 'f1', 'f1', 'f1' |
| * </p> |
| * <p> |
| * scan 'usertable' |
| * Will return: |
| * 0 row(s) in 0.0050 seconds |
| * </p> |
| */ |
| public class WriteSinkCoprocessor extends BaseRegionObserver { |
| private static final Log LOG = LogFactory.getLog(WriteSinkCoprocessor.class); |
| private final AtomicLong ops = new AtomicLong(); |
| private String regionName; |
| |
| @Override |
| public void preOpen(ObserverContext<RegionCoprocessorEnvironment> e) throws IOException { |
| regionName = e.getEnvironment().getRegion().getRegionInfo().getRegionNameAsString(); |
| } |
| |
| |
| @Override |
| public void preBatchMutate(final ObserverContext<RegionCoprocessorEnvironment> c, |
| final MiniBatchOperationInProgress<Mutation> miniBatchOp) |
| throws IOException { |
| if (ops.incrementAndGet() % 20000 == 0) { |
| LOG.info("Wrote " + ops.get() + " times in region " + regionName); |
| } |
| |
| for (int i = 0; i < miniBatchOp.size(); i++) { |
| miniBatchOp.setOperationStatus(i, |
| new OperationStatus(HConstants.OperationStatusCode.SUCCESS)); |
| } |
| c.bypass(); |
| } |
| } |