dlmarion commented on code in PR #2665: URL: https://github.com/apache/accumulo/pull/2665#discussion_r939135839
########## server/tserver/src/main/java/org/apache/accumulo/tserver/ScanServer.java: ########## @@ -0,0 +1,987 @@ +/* + * 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 + * + * https://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.tserver; + +import static java.nio.charset.StandardCharsets.UTF_8; +import static org.apache.accumulo.fate.util.UtilWaitThread.sleepUninterruptibly; + +import java.io.IOException; +import java.io.UncheckedIOException; +import java.net.UnknownHostException; +import java.nio.ByteBuffer; +import java.util.ArrayList; +import java.util.Collection; +import java.util.Collections; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Map.Entry; +import java.util.Objects; +import java.util.Set; +import java.util.UUID; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.ConcurrentSkipListSet; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicLong; +import java.util.concurrent.locks.Condition; +import java.util.concurrent.locks.ReentrantReadWriteLock; +import java.util.stream.Collectors; + +import org.apache.accumulo.core.Constants; +import org.apache.accumulo.core.client.AccumuloException; +import org.apache.accumulo.core.clientImpl.thrift.ThriftSecurityException; +import org.apache.accumulo.core.conf.AccumuloConfiguration; +import org.apache.accumulo.core.conf.Property; +import org.apache.accumulo.core.dataImpl.KeyExtent; +import org.apache.accumulo.core.dataImpl.thrift.InitialMultiScan; +import org.apache.accumulo.core.dataImpl.thrift.InitialScan; +import org.apache.accumulo.core.dataImpl.thrift.IterInfo; +import org.apache.accumulo.core.dataImpl.thrift.MultiScanResult; +import org.apache.accumulo.core.dataImpl.thrift.ScanResult; +import org.apache.accumulo.core.dataImpl.thrift.TColumn; +import org.apache.accumulo.core.dataImpl.thrift.TKeyExtent; +import org.apache.accumulo.core.dataImpl.thrift.TRange; +import org.apache.accumulo.core.file.blockfile.cache.impl.BlockCacheConfiguration; +import org.apache.accumulo.core.metadata.ScanServerRefTabletFile; +import org.apache.accumulo.core.metadata.StoredTabletFile; +import org.apache.accumulo.core.metadata.schema.Ample; +import org.apache.accumulo.core.metadata.schema.TabletMetadata; +import org.apache.accumulo.core.metrics.MetricsUtil; +import org.apache.accumulo.core.securityImpl.thrift.TCredentials; +import org.apache.accumulo.core.spi.scan.ScanServerSelector; +import org.apache.accumulo.core.tabletserver.thrift.ActiveScan; +import org.apache.accumulo.core.tabletserver.thrift.NoSuchScanIDException; +import org.apache.accumulo.core.tabletserver.thrift.NotServingTabletException; +import org.apache.accumulo.core.tabletserver.thrift.TSampleNotPresentException; +import org.apache.accumulo.core.tabletserver.thrift.TSamplerConfiguration; +import org.apache.accumulo.core.tabletserver.thrift.TabletScanClientService; +import org.apache.accumulo.core.tabletserver.thrift.TooManyFilesException; +import org.apache.accumulo.core.trace.thrift.TInfo; +import org.apache.accumulo.core.util.Halt; +import org.apache.accumulo.core.util.HostAndPort; +import org.apache.accumulo.core.util.threads.ThreadPools; +import org.apache.accumulo.fate.util.UtilWaitThread; +import org.apache.accumulo.fate.zookeeper.ServiceLock; +import org.apache.accumulo.fate.zookeeper.ServiceLock.LockLossReason; +import org.apache.accumulo.fate.zookeeper.ServiceLock.LockWatcher; +import org.apache.accumulo.fate.zookeeper.ZooCache; +import org.apache.accumulo.fate.zookeeper.ZooReaderWriter; +import org.apache.accumulo.fate.zookeeper.ZooUtil.NodeExistsPolicy; +import org.apache.accumulo.server.AbstractServer; +import org.apache.accumulo.server.GarbageCollectionLogger; +import org.apache.accumulo.server.ServerContext; +import org.apache.accumulo.server.ServerOpts; +import org.apache.accumulo.server.conf.TableConfiguration; +import org.apache.accumulo.server.fs.VolumeManager; +import org.apache.accumulo.server.rpc.ServerAddress; +import org.apache.accumulo.server.rpc.TServerUtils; +import org.apache.accumulo.server.rpc.ThriftProcessorTypes; +import org.apache.accumulo.server.security.SecurityUtil; +import org.apache.accumulo.tserver.TabletServerResourceManager.TabletResourceManager; +import org.apache.accumulo.tserver.metrics.TabletServerScanMetrics; +import org.apache.accumulo.tserver.session.MultiScanSession; +import org.apache.accumulo.tserver.session.ScanSession; +import org.apache.accumulo.tserver.session.ScanSession.TabletResolver; +import org.apache.accumulo.tserver.session.Session; +import org.apache.accumulo.tserver.session.SessionManager; +import org.apache.accumulo.tserver.session.SingleScanSession; +import org.apache.accumulo.tserver.tablet.SnapshotTablet; +import org.apache.accumulo.tserver.tablet.Tablet; +import org.apache.accumulo.tserver.tablet.TabletBase; +import org.apache.thrift.TException; +import org.apache.thrift.TProcessor; +import org.apache.zookeeper.KeeperException; +import org.checkerframework.checker.nullness.qual.Nullable; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import com.beust.jcommander.Parameter; +import com.github.benmanes.caffeine.cache.CacheLoader; +import com.github.benmanes.caffeine.cache.Caffeine; +import com.github.benmanes.caffeine.cache.LoadingCache; +import com.github.benmanes.caffeine.cache.Scheduler; +import com.google.common.annotations.VisibleForTesting; +import com.google.common.base.Preconditions; +import com.google.common.collect.Sets; + +public class ScanServer extends AbstractServer + implements TabletScanClientService.Iface, TabletHostingServer { + + public static class ScanServerOpts extends ServerOpts { + @Parameter(required = false, names = {"-g", "--group"}, + description = "Optional group name that will be made available to the ScanServerSelector client plugin. If not specified will be set to '" + + ScanServerSelector.DEFAULT_SCAN_SERVER_GROUP_NAME + + "'. Groups support at least two use cases : dedicating resources to scans and/or using different hardware for scans.") + private String groupName = ScanServerSelector.DEFAULT_SCAN_SERVER_GROUP_NAME; + + public String getGroupName() { + return groupName; + } + } + + private static final Logger log = LoggerFactory.getLogger(ScanServer.class); + + private static class TabletMetadataLoader implements CacheLoader<KeyExtent,TabletMetadata> { + + private final Ample ample; + + private TabletMetadataLoader(Ample ample) { + this.ample = ample; + } + + @Override + public @Nullable TabletMetadata load(KeyExtent keyExtent) { + long t1 = System.currentTimeMillis(); + var tm = ample.readTablet(keyExtent); + long t2 = System.currentTimeMillis(); + LOG.trace("Read metadata for 1 tablet in {} ms", t2 - t1); + return tm; + } + + @Override + @SuppressWarnings("unchecked") Review Comment: Resolved in f437fed -- This is an automated message from the Apache Git Service. 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