HDFS-15879. Exclude slow nodes when choose targets for blocks (#2748)
Reviewed-by: Dinesh Chitlangia <dineshc@apache.org> Reviewed-by: Takanobu Asanuma <tasanuma@apache.org>
This commit is contained in:
parent
f5c1557288
commit
72037a63b1
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@ -1023,6 +1023,14 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
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"dfs.datanode.outliers.report.interval";
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public static final String DFS_DATANODE_OUTLIERS_REPORT_INTERVAL_DEFAULT =
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"30m";
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public static final String DFS_NAMENODE_MAX_SLOWPEER_COLLECT_NODES_KEY =
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"dfs.namenode.max.slowpeer.collect.nodes";
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public static final int DFS_NAMENODE_MAX_SLOWPEER_COLLECT_NODES_DEFAULT =
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5;
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public static final String DFS_NAMENODE_SLOWPEER_COLLECT_INTERVAL_KEY =
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"dfs.namenode.slowpeer.collect.interval";
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public static final String DFS_NAMENODE_SLOWPEER_COLLECT_INTERVAL_DEFAULT =
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"30m";
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// property for fsimage compression
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public static final String DFS_IMAGE_COMPRESS_KEY = "dfs.image.compress";
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@ -1176,6 +1184,13 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
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public static final String DFS_NAMENODE_BLOCKPLACEMENTPOLICY_DEFAULT_PREFER_LOCAL_NODE_KEY =
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"dfs.namenode.block-placement-policy.default.prefer-local-node";
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public static final boolean DFS_NAMENODE_BLOCKPLACEMENTPOLICY_DEFAULT_PREFER_LOCAL_NODE_DEFAULT = true;
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public static final String
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DFS_NAMENODE_BLOCKPLACEMENTPOLICY_EXCLUDE_SLOW_NODES_ENABLED_KEY =
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"dfs.namenode.block-placement-policy.exclude-slow-nodes.enabled";
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public static final boolean
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DFS_NAMENODE_BLOCKPLACEMENTPOLICY_EXCLUDE_SLOW_NODES_ENABLED_DEFAULT =
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false;
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public static final String DFS_NAMENODE_GC_TIME_MONITOR_ENABLE =
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"dfs.namenode.gc.time.monitor.enable";
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public static final boolean DFS_NAMENODE_GC_TIME_MONITOR_ENABLE_DEFAULT =
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@ -17,6 +17,8 @@
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*/
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package org.apache.hadoop.hdfs.server.blockmanagement;
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import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_BLOCKPLACEMENTPOLICY_EXCLUDE_SLOW_NODES_ENABLED_DEFAULT;
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import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_BLOCKPLACEMENTPOLICY_EXCLUDE_SLOW_NODES_ENABLED_KEY;
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import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_CONSIDERLOADBYSTORAGETYPE_DEFAULT;
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import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_CONSIDERLOADBYSTORAGETYPE_KEY;
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import static org.apache.hadoop.util.Time.monotonicNow;
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@ -82,7 +84,8 @@ public class BlockPlacementPolicyDefault extends BlockPlacementPolicy {
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NODE_TOO_BUSY("the node is too busy"),
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TOO_MANY_NODES_ON_RACK("the rack has too many chosen nodes"),
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NOT_ENOUGH_STORAGE_SPACE("not enough storage space to place the block"),
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NO_REQUIRED_STORAGE_TYPE("required storage types are unavailable");
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NO_REQUIRED_STORAGE_TYPE("required storage types are unavailable"),
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NODE_SLOW("the node is too slow");
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private final String text;
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@ -99,6 +102,8 @@ public class BlockPlacementPolicyDefault extends BlockPlacementPolicy {
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private boolean considerLoadByStorageType;
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protected double considerLoadFactor;
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private boolean preferLocalNode;
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private boolean dataNodePeerStatsEnabled;
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private boolean excludeSlowNodesEnabled;
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protected NetworkTopology clusterMap;
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protected Host2NodesMap host2datanodeMap;
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private FSClusterStats stats;
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@ -144,6 +149,12 @@ public class BlockPlacementPolicyDefault extends BlockPlacementPolicy {
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DFS_NAMENODE_BLOCKPLACEMENTPOLICY_DEFAULT_PREFER_LOCAL_NODE_KEY,
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DFSConfigKeys.
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DFS_NAMENODE_BLOCKPLACEMENTPOLICY_DEFAULT_PREFER_LOCAL_NODE_DEFAULT);
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this.dataNodePeerStatsEnabled = conf.getBoolean(
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DFSConfigKeys.DFS_DATANODE_PEER_STATS_ENABLED_KEY,
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DFSConfigKeys.DFS_DATANODE_PEER_STATS_ENABLED_DEFAULT);
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this.excludeSlowNodesEnabled = conf.getBoolean(
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DFS_NAMENODE_BLOCKPLACEMENTPOLICY_EXCLUDE_SLOW_NODES_ENABLED_KEY,
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DFS_NAMENODE_BLOCKPLACEMENTPOLICY_EXCLUDE_SLOW_NODES_ENABLED_DEFAULT);
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}
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@Override
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@ -1091,6 +1102,15 @@ public class BlockPlacementPolicyDefault extends BlockPlacementPolicy {
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return false;
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}
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// check if the target is a slow node
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if (dataNodePeerStatsEnabled && excludeSlowNodesEnabled) {
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Set<Node> nodes = DatanodeManager.getSlowNodes();
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if (nodes.contains(node)) {
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logNodeIsNotChosen(node, NodeNotChosenReason.NODE_SLOW);
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return false;
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}
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}
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return true;
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}
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@ -18,8 +18,12 @@
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package org.apache.hadoop.hdfs.server.blockmanagement;
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import static org.apache.hadoop.hdfs.server.protocol.DatanodeProtocol.DNA_ERASURE_CODING_RECONSTRUCTION;
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import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_BLOCKPLACEMENTPOLICY_EXCLUDE_SLOW_NODES_ENABLED_KEY;
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import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_BLOCKPLACEMENTPOLICY_EXCLUDE_SLOW_NODES_ENABLED_DEFAULT;
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import static org.apache.hadoop.util.Time.monotonicNow;
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import org.apache.hadoop.thirdparty.com.google.common.collect.Sets;
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import org.apache.commons.lang3.StringUtils;
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import org.apache.hadoop.thirdparty.com.google.common.annotations.VisibleForTesting;
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import org.apache.hadoop.thirdparty.com.google.common.base.Preconditions;
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import org.apache.hadoop.thirdparty.com.google.common.net.InetAddresses;
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@ -53,6 +57,7 @@ import org.apache.hadoop.ipc.Server;
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import org.apache.hadoop.net.*;
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import org.apache.hadoop.net.NetworkTopology.InvalidTopologyException;
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import org.apache.hadoop.security.token.Token;
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import org.apache.hadoop.util.Daemon;
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import org.apache.hadoop.util.ReflectionUtils;
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import org.apache.hadoop.util.Timer;
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@ -201,8 +206,16 @@ public class DatanodeManager {
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*/
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private final boolean useDfsNetworkTopology;
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private static final String IP_PORT_SEPARATOR = ":";
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@Nullable
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private final SlowPeerTracker slowPeerTracker;
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private static Set<Node> slowNodesSet = Sets.newConcurrentHashSet();
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private Daemon slowPeerCollectorDaemon;
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private final long slowPeerCollectionInterval;
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private final int maxSlowPeerReportNodes;
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private boolean excludeSlowNodesEnabled;
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@Nullable
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private final SlowDiskTracker slowDiskTracker;
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@ -242,11 +255,22 @@ public class DatanodeManager {
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DFSConfigKeys.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY,
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DFSConfigKeys.
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DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_DEFAULT));
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final Timer timer = new Timer();
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this.slowPeerTracker = dataNodePeerStatsEnabled ?
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new SlowPeerTracker(conf, timer) : null;
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this.excludeSlowNodesEnabled = conf.getBoolean(
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DFS_NAMENODE_BLOCKPLACEMENTPOLICY_EXCLUDE_SLOW_NODES_ENABLED_KEY,
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DFS_NAMENODE_BLOCKPLACEMENTPOLICY_EXCLUDE_SLOW_NODES_ENABLED_DEFAULT);
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this.maxSlowPeerReportNodes = conf.getInt(
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DFSConfigKeys.DFS_NAMENODE_MAX_SLOWPEER_COLLECT_NODES_KEY,
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DFSConfigKeys.DFS_NAMENODE_MAX_SLOWPEER_COLLECT_NODES_DEFAULT);
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this.slowPeerCollectionInterval = conf.getTimeDuration(
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DFSConfigKeys.DFS_NAMENODE_SLOWPEER_COLLECT_INTERVAL_KEY,
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DFSConfigKeys.DFS_NAMENODE_SLOWPEER_COLLECT_INTERVAL_DEFAULT,
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TimeUnit.MILLISECONDS);
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if (slowPeerTracker != null && excludeSlowNodesEnabled) {
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startSlowPeerCollector();
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}
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this.slowDiskTracker = dataNodeDiskStatsEnabled ?
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new SlowDiskTracker(conf, timer) : null;
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@ -356,6 +380,44 @@ public class DatanodeManager {
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DFSConfigKeys.DFS_NAMENODE_BLOCKS_PER_POSTPONEDBLOCKS_RESCAN_KEY_DEFAULT);
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}
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private void startSlowPeerCollector() {
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if (slowPeerCollectorDaemon != null) {
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return;
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}
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slowPeerCollectorDaemon = new Daemon(new Runnable() {
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@Override
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public void run() {
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while (true) {
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try {
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slowNodesSet = getSlowPeers();
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} catch (Exception e) {
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LOG.error("Failed to collect slow peers", e);
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}
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try {
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Thread.sleep(slowPeerCollectionInterval);
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} catch (InterruptedException e) {
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LOG.error("Slow peers collection thread interrupted", e);
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return;
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}
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}
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}
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});
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slowPeerCollectorDaemon.start();
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}
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public void stopSlowPeerCollector() {
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if (slowPeerCollectorDaemon == null) {
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return;
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}
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slowPeerCollectorDaemon.interrupt();
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try {
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slowPeerCollectorDaemon.join();
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} catch (InterruptedException e) {
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LOG.error("Slow peers collection thread did not shutdown", e);
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}
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}
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private static long getStaleIntervalFromConf(Configuration conf,
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long heartbeatExpireInterval) {
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long staleInterval = conf.getLong(
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@ -401,6 +463,7 @@ public class DatanodeManager {
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void close() {
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datanodeAdminManager.close();
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heartbeatManager.close();
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stopSlowPeerCollector();
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}
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/** @return the network topology. */
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@ -2019,6 +2082,48 @@ public class DatanodeManager {
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return slowPeerTracker != null ? slowPeerTracker.getJson() : null;
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}
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/**
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* Returns all tracking slow peers.
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* @return
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*/
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public Set<Node> getSlowPeers() {
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Set<Node> slowPeersSet = Sets.newConcurrentHashSet();
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if (slowPeerTracker == null) {
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return slowPeersSet;
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}
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ArrayList<String> slowNodes =
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slowPeerTracker.getSlowNodes(maxSlowPeerReportNodes);
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for (String slowNode : slowNodes) {
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if (StringUtils.isBlank(slowNode)
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|| !slowNode.contains(IP_PORT_SEPARATOR)) {
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continue;
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}
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String ipAddr = slowNode.split(IP_PORT_SEPARATOR)[0];
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DatanodeDescriptor datanodeByHost =
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host2DatanodeMap.getDatanodeByHost(ipAddr);
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if (datanodeByHost != null) {
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slowPeersSet.add(datanodeByHost);
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}
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}
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return slowPeersSet;
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}
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/**
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* Returns all tracking slow peers.
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* @return
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*/
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public static Set<Node> getSlowNodes() {
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return slowNodesSet;
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}
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/**
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* Use only for testing.
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*/
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@VisibleForTesting
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public SlowPeerTracker getSlowPeerTracker() {
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return slowPeerTracker;
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}
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/**
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* Use only for testing.
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*/
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@ -34,6 +34,7 @@ import org.apache.hadoop.util.Timer;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.Comparator;
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@ -233,6 +234,23 @@ public class SlowPeerTracker {
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}
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}
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/**
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* Returns all tracking slow peers.
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* @param numNodes
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* @return
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*/
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public ArrayList<String> getSlowNodes(int numNodes) {
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Collection<ReportForJson> jsonReports = getJsonReports(numNodes);
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ArrayList<String> slowNodes = new ArrayList<>();
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for (ReportForJson jsonReport : jsonReports) {
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slowNodes.add(jsonReport.getSlowNode());
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}
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if (!slowNodes.isEmpty()) {
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LOG.warn("Slow nodes list: " + slowNodes);
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}
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return slowNodes;
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}
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/**
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* Retrieve reports in a structure for generating JSON, limiting the
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* output to the top numNodes nodes i.e nodes with the most reports.
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@ -2368,6 +2368,36 @@
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</description>
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</property>
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<property>
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<name>dfs.namenode.block-placement-policy.exclude-slow-nodes.enabled</name>
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<value>false</value>
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<description>
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If this is set to true, we will filter out slow nodes
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when choosing targets for blocks.
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</description>
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</property>
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<property>
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<name>dfs.namenode.max.slowpeer.collect.nodes</name>
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<value>5</value>
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<description>
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How many slow nodes we will collect for filtering out
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when choosing targets for blocks.
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It is ignored if dfs.namenode.block-placement-policy.exclude-slow-nodes.enabled is false.
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</description>
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</property>
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<property>
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<name>dfs.namenode.slowpeer.collect.interval</name>
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<value>30m</value>
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<description>
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Interval at which the slow peer trackers runs in the background to collect slow peers.
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It is ignored if dfs.namenode.block-placement-policy.exclude-slow-nodes.enabled is false.
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</description>
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</property>
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<property>
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<name>dfs.datanode.fileio.profiling.sampling.percentage</name>
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<value>0</value>
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@ -0,0 +1,131 @@
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.hdfs.server.blockmanagement;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.hdfs.DFSConfigKeys;
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import org.apache.hadoop.hdfs.DFSTestUtil;
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import org.apache.hadoop.hdfs.TestBlockStoragePolicy;
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import org.apache.hadoop.hdfs.server.namenode.NameNode;
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import org.apache.hadoop.net.Node;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import org.junit.runners.Parameterized;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Set;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertTrue;
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@RunWith(Parameterized.class)
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public class TestReplicationPolicyExcludeSlowNodes
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extends BaseReplicationPolicyTest {
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public TestReplicationPolicyExcludeSlowNodes(String blockPlacementPolicy) {
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this.blockPlacementPolicy = blockPlacementPolicy;
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}
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@Parameterized.Parameters
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public static Iterable<Object[]> data() {
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return Arrays.asList(new Object[][] {
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{BlockPlacementPolicyDefault.class.getName()},
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{BlockPlacementPolicyWithUpgradeDomain.class.getName()},
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{AvailableSpaceBlockPlacementPolicy.class.getName()},
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{BlockPlacementPolicyRackFaultTolerant.class.getName()},
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{AvailableSpaceRackFaultTolerantBlockPlacementPolicy.class.getName()},
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});
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}
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@Override
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DatanodeDescriptor[] getDatanodeDescriptors(Configuration conf) {
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conf.setBoolean(DFSConfigKeys
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.DFS_DATANODE_PEER_STATS_ENABLED_KEY,
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true);
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conf.setStrings(DFSConfigKeys
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.DFS_NAMENODE_SLOWPEER_COLLECT_INTERVAL_KEY,
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"1s");
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conf.setBoolean(DFSConfigKeys
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.DFS_NAMENODE_BLOCKPLACEMENTPOLICY_EXCLUDE_SLOW_NODES_ENABLED_KEY,
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true);
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final String[] racks = {
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"/rack1",
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"/rack2",
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"/rack3",
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"/rack4",
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"/rack5",
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"/rack6"};
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storages = DFSTestUtil.createDatanodeStorageInfos(racks);
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return DFSTestUtil.toDatanodeDescriptor(storages);
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}
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/**
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* Tests that chooseTarget when excludeSlowNodesEnabled set to true.
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*/
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@Test
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public void testChooseTargetExcludeSlowNodes() throws Exception {
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namenode.getNamesystem().writeLock();
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try {
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// add nodes
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for (int i = 0; i < dataNodes.length; i++) {
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dnManager.addDatanode(dataNodes[i]);
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}
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// mock slow nodes
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SlowPeerTracker tracker = dnManager.getSlowPeerTracker();
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tracker.addReport(dataNodes[0].getInfoAddr(), dataNodes[3].getInfoAddr());
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tracker.addReport(dataNodes[0].getInfoAddr(), dataNodes[4].getInfoAddr());
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tracker.addReport(dataNodes[1].getInfoAddr(), dataNodes[4].getInfoAddr());
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tracker.addReport(dataNodes[1].getInfoAddr(), dataNodes[5].getInfoAddr());
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tracker.addReport(dataNodes[2].getInfoAddr(), dataNodes[3].getInfoAddr());
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tracker.addReport(dataNodes[2].getInfoAddr(), dataNodes[5].getInfoAddr());
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// waiting for slow nodes collector run
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Thread.sleep(3000);
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// fetch slow nodes
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Set<Node> slowPeers = dnManager.getSlowPeers();
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// assert slow nodes
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assertEquals(3, slowPeers.size());
|
||||
for (int i = 0; i < slowPeers.size(); i++) {
|
||||
assertTrue(slowPeers.contains(dataNodes[i]));
|
||||
}
|
||||
|
||||
// mock writer
|
||||
DatanodeDescriptor writerDn = dataNodes[0];
|
||||
|
||||
// call chooseTarget()
|
||||
DatanodeStorageInfo[] targets = namenode.getNamesystem().getBlockManager()
|
||||
.getBlockPlacementPolicy().chooseTarget("testFile.txt", 3,
|
||||
writerDn, new ArrayList<DatanodeStorageInfo>(), false, null,
|
||||
1024, TestBlockStoragePolicy.DEFAULT_STORAGE_POLICY, null);
|
||||
|
||||
// assert targets
|
||||
assertEquals(3, targets.length);
|
||||
for (int i = 0; i < targets.length; i++) {
|
||||
assertTrue(!slowPeers.contains(targets[i].getDatanodeDescriptor()));
|
||||
}
|
||||
} finally {
|
||||
namenode.getNamesystem().writeUnlock();
|
||||
}
|
||||
NameNode.LOG.info("Done working on it");
|
||||
}
|
||||
|
||||
}
|
Loading…
Reference in New Issue