| /** |
| * 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.fs.slive; |
| |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.Random; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.fs.FileStatus; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.slive.OperationOutput.OutputType; |
| |
| /** |
| * Operation which selects a random file and truncates a random amount of bytes |
| * (selected from the configuration for truncate size) from that file, |
| * if it exists. |
| * |
| * This operation will capture statistics on success for bytes written, time |
| * taken (milliseconds), and success count and on failure it will capture the |
| * number of failures and the time taken (milliseconds) to fail. |
| */ |
| class TruncateOp extends Operation { |
| |
| private static final Log LOG = LogFactory.getLog(TruncateOp.class); |
| |
| TruncateOp(ConfigExtractor cfg, Random rnd) { |
| super(TruncateOp.class.getSimpleName(), cfg, rnd); |
| } |
| |
| /** |
| * Gets the file to truncate from |
| * |
| * @return Path |
| */ |
| protected Path getTruncateFile() { |
| Path fn = getFinder().getFile(); |
| return fn; |
| } |
| |
| @Override // Operation |
| List<OperationOutput> run(FileSystem fs) { |
| List<OperationOutput> out = super.run(fs); |
| try { |
| Path fn = getTruncateFile(); |
| boolean waitOnTruncate = getConfig().shouldWaitOnTruncate(); |
| long currentSize = fs.getFileStatus(fn).getLen(); |
| // determine file status for file length requirement |
| // to know if should fill in partial bytes |
| Range<Long> truncateSizeRange = getConfig().getTruncateSize(); |
| if (getConfig().shouldTruncateUseBlockSize()) { |
| truncateSizeRange = getConfig().getBlockSize(); |
| } |
| long truncateSize = Math.max(0L, |
| currentSize - Range.betweenPositive(getRandom(), truncateSizeRange)); |
| long timeTaken = 0; |
| LOG.info("Attempting to truncate file at " + fn + " to size " |
| + Helper.toByteInfo(truncateSize)); |
| { |
| // truncate |
| long startTime = Timer.now(); |
| boolean completed = fs.truncate(fn, truncateSize); |
| if(!completed && waitOnTruncate) |
| waitForRecovery(fs, fn, truncateSize); |
| timeTaken += Timer.elapsed(startTime); |
| } |
| out.add(new OperationOutput(OutputType.LONG, getType(), |
| ReportWriter.BYTES_WRITTEN, 0)); |
| out.add(new OperationOutput(OutputType.LONG, getType(), |
| ReportWriter.OK_TIME_TAKEN, timeTaken)); |
| out.add(new OperationOutput(OutputType.LONG, getType(), |
| ReportWriter.SUCCESSES, 1L)); |
| LOG.info("Truncate file " + fn + " to " + Helper.toByteInfo(truncateSize) |
| + " in " + timeTaken + " milliseconds"); |
| } catch (FileNotFoundException e) { |
| out.add(new OperationOutput(OutputType.LONG, getType(), |
| ReportWriter.NOT_FOUND, 1L)); |
| LOG.warn("Error with truncating", e); |
| } catch (IOException e) { |
| out.add(new OperationOutput(OutputType.LONG, getType(), |
| ReportWriter.FAILURES, 1L)); |
| LOG.warn("Error with truncating", e); |
| } |
| return out; |
| } |
| |
| private void waitForRecovery(FileSystem fs, Path fn, long newLength) |
| throws IOException { |
| LOG.info("Waiting on truncate file recovery for " + fn); |
| for(;;) { |
| FileStatus stat = fs.getFileStatus(fn); |
| if(stat.getLen() == newLength) break; |
| try {Thread.sleep(1000);} catch(InterruptedException ignored) {} |
| } |
| } |
| } |