| /* |
| * 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.fluo.command; |
| |
| import java.util.Collections; |
| import java.util.List; |
| |
| import org.apache.accumulo.core.client.AccumuloException; |
| import org.apache.accumulo.core.client.AccumuloSecurityException; |
| import org.apache.accumulo.core.client.Scanner; |
| import org.apache.accumulo.core.client.TableNotFoundException; |
| import org.apache.fluo.api.config.FluoConfiguration; |
| import org.apache.fluo.core.client.FluoAdminImpl; |
| import org.apache.fluo.core.impl.Environment; |
| import org.apache.fluo.core.impl.Notification; |
| import org.apache.fluo.core.util.UtilWaitThread; |
| import org.apache.fluo.core.worker.finder.hash.TableRange; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import static java.util.concurrent.TimeUnit.MINUTES; |
| |
| public class FluoWait { |
| |
| private static final Logger log = LoggerFactory.getLogger(FluoWait.class); |
| private static final long MIN_SLEEP_MS = 250; |
| private static final long MAX_SLEEP_MS = MINUTES.toMillis(5); |
| |
| private static List<TableRange> getRanges(Environment env) |
| throws TableNotFoundException, AccumuloSecurityException, AccumuloException { |
| List<TableRange> ranges = |
| TableRange.fromTexts(env.getAccumuloClient().tableOperations().listSplits(env.getTable())); |
| Collections.shuffle(ranges); |
| return ranges; |
| } |
| |
| private static boolean hasNotifications(Environment env, TableRange range) |
| throws TableNotFoundException { |
| try (Scanner scanner = |
| env.getAccumuloClient().createScanner(env.getTable(), env.getAuthorizations())) { |
| scanner.setRange(range.getRange()); |
| Notification.configureScanner(scanner); |
| |
| return scanner.iterator().hasNext(); |
| } |
| } |
| |
| /** |
| * Wait until a range has no notifications. |
| * |
| * @return true if notifications were ever seen while waiting |
| */ |
| private static boolean waitTillNoNotifications(Environment env, TableRange range) |
| throws TableNotFoundException { |
| boolean sawNotifications = false; |
| long retryTime = MIN_SLEEP_MS; |
| |
| log.debug("Scanning tablet {} for notifications", range); |
| |
| long start = System.currentTimeMillis(); |
| while (hasNotifications(env, range)) { |
| sawNotifications = true; |
| long sleepTime = Math.max(System.currentTimeMillis() - start, retryTime); |
| log.debug("Tablet {} had notfications, will rescan in {}ms", range, sleepTime); |
| UtilWaitThread.sleep(sleepTime); |
| retryTime = Math.min(MAX_SLEEP_MS, (long) (retryTime * 1.5)); |
| start = System.currentTimeMillis(); |
| } |
| |
| return sawNotifications; |
| } |
| |
| /** |
| * Wait until a scan of the table completes without seeing notifications AND without the Oracle |
| * issuing any timestamps during the scan. |
| */ |
| private static void waitUntilFinished(FluoConfiguration config) { |
| try (Environment env = new Environment(config)) { |
| List<TableRange> ranges = getRanges(env); |
| |
| outer: while (true) { |
| long ts1 = env.getSharedResources().getOracleClient().getStamp().getTxTimestamp(); |
| for (TableRange range : ranges) { |
| boolean sawNotifications = waitTillNoNotifications(env, range); |
| if (sawNotifications) { |
| ranges = getRanges(env); |
| // This range had notifications. Processing those notifications may have created |
| // notifications in previously scanned ranges, so start over. |
| continue outer; |
| } |
| } |
| long ts2 = env.getSharedResources().getOracleClient().getStamp().getTxTimestamp(); |
| |
| // Check to ensure the Oracle issued no timestamps during the scan for notifications. |
| if (ts2 - ts1 == 1) { |
| break; |
| } |
| } |
| } catch (Exception e) { |
| log.error("An exception was thrown -", e); |
| System.exit(-1); |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| CommonOpts opts = CommonOpts.parse("fluo wait", args); |
| FluoConfiguration config = CommandUtil.resolveFluoConfig(); |
| config.setApplicationName(opts.getApplicationName()); |
| opts.overrideFluoConfig(config); |
| CommandUtil.verifyAppRunning(config); |
| config = FluoAdminImpl.mergeZookeeperConfig(config); |
| waitUntilFinished(config); |
| } |
| } |