HDFS-15707. NNTop counts don't add up as expected. (#2516)
This commit is contained in:
Ahmed Hussein
GitHub
parent
da1ea2530f
commit
32099e36dd
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@ -23,7 +23,6 @@ import org.apache.hadoop.classification.InterfaceAudience;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.FileStatus;
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import org.apache.hadoop.hdfs.DFSConfigKeys;
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import org.apache.hadoop.hdfs.server.namenode.top.TopConf;
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import org.apache.hadoop.hdfs.server.namenode.top.window.RollingWindowManager;
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import org.apache.hadoop.hdfs.server.namenode.top.window.RollingWindowManager.Op;
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import org.apache.hadoop.hdfs.server.namenode.top.window.RollingWindowManager.User;
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@ -144,8 +143,6 @@ public class TopMetrics implements MetricsSource {
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for (RollingWindowManager rollingWindowManager : rollingWindowManagers
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.values()) {
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rollingWindowManager.recordMetric(currTime, cmd, userName, 1);
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rollingWindowManager.recordMetric(currTime,
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TopConf.ALL_CMDS, userName, 1);
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}
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}
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@ -113,8 +113,8 @@ public class RollingWindow {
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* as well as atomic fields.
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*/
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private class Bucket {
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AtomicLong value = new AtomicLong(0);
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AtomicLong updateTime = new AtomicLong(0);
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private AtomicLong value = new AtomicLong(0);
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private AtomicLong updateTime = new AtomicLong(-1); // -1 = never updated.
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/**
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* Check whether the last time that the bucket was updated is no longer
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@ -125,7 +125,7 @@ public class RollingWindow {
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*/
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boolean isStaleNow(long time) {
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long utime = updateTime.get();
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return time - utime >= windowLenMs;
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return (utime == -1) || (time - utime >= windowLenMs);
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}
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/**
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@ -17,20 +17,22 @@
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*/
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package org.apache.hadoop.hdfs.server.namenode.top.window;
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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.HashSet;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.Stack;
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import java.util.concurrent.ConcurrentHashMap;
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import org.apache.hadoop.hdfs.server.namenode.top.TopConf;
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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.collect.Lists;
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import org.apache.hadoop.classification.InterfaceAudience;
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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.metrics2.util.Metrics2Util.NameValuePair;
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import org.apache.hadoop.metrics2.util.Metrics2Util.TopN;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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@ -66,11 +68,15 @@ public class RollingWindowManager {
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public TopWindow(int windowMillis) {
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this.windowMillis = windowMillis;
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this.top = Lists.newArrayList();
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this.top = new LinkedList<>();
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}
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public void addOp(Op op) {
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top.add(op);
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if (op.getOpType().equals(TopConf.ALL_CMDS)) {
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top.add(0, op);
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} else {
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top.add(op);
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}
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}
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public int getWindowLenMs() {
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@ -86,41 +92,59 @@ public class RollingWindowManager {
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* Represents an operation within a TopWindow. It contains a ranked
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* set of the top users for the operation.
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*/
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public static class Op {
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public static class Op implements Comparable<Op> {
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private final String opType;
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private final List<User> topUsers;
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private final List<User> users;
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private final long totalCount;
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private final int limit;
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public Op(String opType, long totalCount) {
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public Op(String opType, UserCounts users, int limit) {
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this.opType = opType;
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this.topUsers = Lists.newArrayList();
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this.totalCount = totalCount;
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}
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public void addUser(User u) {
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topUsers.add(u);
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this.users = new ArrayList<>(users);
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this.users.sort(Collections.reverseOrder());
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this.totalCount = users.getTotal();
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this.limit = limit;
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}
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public String getOpType() {
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return opType;
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}
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public List<User> getAllUsers() {
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return users;
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}
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public List<User> getTopUsers() {
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return topUsers;
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return (users.size() > limit) ? users.subList(0, limit) : users;
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}
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public long getTotalCount() {
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return totalCount;
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}
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@Override
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public int compareTo(Op other) {
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return Long.signum(totalCount - other.totalCount);
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}
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@Override
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public boolean equals(Object o) {
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return (o instanceof Op) && totalCount == ((Op)o).totalCount;
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}
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@Override
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public int hashCode() {
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return opType.hashCode();
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}
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}
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/**
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* Represents a user who called an Op within a TopWindow. Specifies the
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* user and the number of times the user called the operation.
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*/
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public static class User {
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public static class User implements Comparable<User> {
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private final String user;
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private final long count;
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private long count;
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public User(String user, long count) {
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this.user = user;
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@ -134,6 +158,56 @@ public class RollingWindowManager {
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public long getCount() {
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return count;
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}
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public void add(long delta) {
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count += delta;
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}
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@Override
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public int compareTo(User other) {
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return Long.signum(count - other.count);
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}
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@Override
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public boolean equals(Object o) {
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return (o instanceof User) && user.equals(((User)o).user);
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}
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@Override
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public int hashCode() {
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return user.hashCode();
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}
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}
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private static class UserCounts extends ArrayList<User> {
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private long total = 0;
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UserCounts(int capacity) {
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super(capacity);
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}
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@Override
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public boolean add(User user) {
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long count = user.getCount();
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int i = indexOf(user);
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if (i == -1) {
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super.add(new User(user.getUser(), count));
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} else {
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get(i).add(count);
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}
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total += count;
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return true;
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}
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@Override
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public boolean addAll(Collection<? extends User> users) {
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users.forEach(user -> add(user));
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return true;
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}
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public long getTotal() {
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return total;
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}
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}
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/**
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@ -142,7 +216,7 @@ public class RollingWindowManager {
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* operated on that metric.
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*/
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public ConcurrentHashMap<String, RollingWindowMap> metricMap =
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new ConcurrentHashMap<String, RollingWindowMap>();
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new ConcurrentHashMap<>();
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public RollingWindowManager(Configuration conf, int reportingPeriodMs) {
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@ -184,35 +258,33 @@ public class RollingWindowManager {
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*
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* @param time the current time
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* @return a TopWindow describing the top users for each metric in the
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* window.
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* window.
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*/
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public TopWindow snapshot(long time) {
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TopWindow window = new TopWindow(windowLenMs);
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Set<String> metricNames = metricMap.keySet();
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LOG.debug("iterating in reported metrics, size={} values={}",
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metricNames.size(), metricNames);
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UserCounts totalCounts = new UserCounts(metricMap.size());
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for (Map.Entry<String, RollingWindowMap> entry : metricMap.entrySet()) {
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String metricName = entry.getKey();
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RollingWindowMap rollingWindows = entry.getValue();
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TopN topN = getTopUsersForMetric(time, metricName, rollingWindows);
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final int size = topN.size();
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if (size == 0) {
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continue;
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}
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Op op = new Op(metricName, topN.getTotal());
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window.addOp(op);
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// Reverse the users from the TopUsers using a stack,
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// since we'd like them sorted in descending rather than ascending order
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Stack<NameValuePair> reverse = new Stack<NameValuePair>();
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for (int i = 0; i < size; i++) {
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reverse.push(topN.poll());
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}
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for (int i = 0; i < size; i++) {
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NameValuePair userEntry = reverse.pop();
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User user = new User(userEntry.getName(), userEntry.getValue());
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op.addUser(user);
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UserCounts topN = getTopUsersForMetric(time, metricName, rollingWindows);
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if (!topN.isEmpty()) {
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window.addOp(new Op(metricName, topN, topUsersCnt));
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totalCounts.addAll(topN);
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}
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}
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// synthesize the overall total op count with the top users for every op.
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Set<User> topUsers = new HashSet<>();
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for (Op op : window.getOps()) {
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topUsers.addAll(op.getTopUsers());
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}
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// intersect totals with the top users.
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totalCounts.retainAll(topUsers);
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// allowed to exceed the per-op topUsersCnt to capture total ops for
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// any user
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window.addOp(new Op(TopConf.ALL_CMDS, totalCounts, Integer.MAX_VALUE));
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return window;
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}
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@ -223,9 +295,9 @@ public class RollingWindowManager {
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* @param metricName Name of metric
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* @return
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*/
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private TopN getTopUsersForMetric(long time, String metricName,
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private UserCounts getTopUsersForMetric(long time, String metricName,
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RollingWindowMap rollingWindows) {
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TopN topN = new TopN(topUsersCnt);
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UserCounts topN = new UserCounts(topUsersCnt);
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Iterator<Map.Entry<String, RollingWindow>> iterator =
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rollingWindows.entrySet().iterator();
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while (iterator.hasNext()) {
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@ -242,7 +314,7 @@ public class RollingWindowManager {
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}
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LOG.debug("offer window of metric: {} userName: {} sum: {}",
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metricName, userName, windowSum);
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topN.offer(new NameValuePair(userName, windowSum));
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topN.add(new User(userName, windowSum));
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}
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LOG.debug("topN users size for command {} is: {}",
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metricName, topN.size());
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@ -17,12 +17,16 @@
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*/
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package org.apache.hadoop.hdfs.server.namenode.top.window;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Random;
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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.log4j.Level;
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import org.apache.log4j.Logger;
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import org.apache.hadoop.hdfs.server.namenode.top.TopConf;
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import org.junit.Assert;
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import org.junit.Before;
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import org.junit.Test;
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@ -56,7 +60,7 @@ public class TestRollingWindowManager {
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}
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@Test
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public void testTops() {
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public void testTops() throws Exception {
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long time = WINDOW_LEN_MS + BUCKET_LEN * 3 / 2;
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for (int i = 0; i < users.length; i++)
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manager.recordMetric(time, "open", users[i], (i + 1) * 2);
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@ -66,11 +70,12 @@ public class TestRollingWindowManager {
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time++;
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TopWindow tops = manager.snapshot(time);
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assertEquals("Unexpected number of ops", 2, tops.getOps().size());
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assertEquals("Unexpected number of ops", 3, tops.getOps().size());
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assertEquals(TopConf.ALL_CMDS, tops.getOps().get(0).getOpType());
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for (Op op : tops.getOps()) {
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final List<User> topUsers = op.getTopUsers();
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assertEquals("Unexpected number of users", N_TOP_USERS, topUsers.size());
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if (op.getOpType() == "open") {
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if (op.getOpType().equals("open")) {
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for (int i = 0; i < topUsers.size(); i++) {
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User user = topUsers.get(i);
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assertEquals("Unexpected count for user " + user.getUser(),
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@ -86,8 +91,9 @@ public class TestRollingWindowManager {
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// move the window forward not to see the "open" results
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time += WINDOW_LEN_MS - 2;
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tops = manager.snapshot(time);
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assertEquals("Unexpected number of ops", 1, tops.getOps().size());
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final Op op = tops.getOps().get(0);
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assertEquals("Unexpected number of ops", 2, tops.getOps().size());
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assertEquals(TopConf.ALL_CMDS, tops.getOps().get(0).getOpType());
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final Op op = tops.getOps().get(1);
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assertEquals("Should only see close ops", "close", op.getOpType());
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final List<User> topUsers = op.getTopUsers();
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for (int i = 0; i < topUsers.size(); i++) {
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@ -99,4 +105,158 @@ public class TestRollingWindowManager {
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assertEquals("Unexpected total count for op",
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(1 + users.length) * (users.length / 2), op.getTotalCount());
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}
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@Test
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public void windowReset() throws Exception {
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Configuration config = new Configuration();
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config.setInt(DFSConfigKeys.NNTOP_BUCKETS_PER_WINDOW_KEY, 1);
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config.setInt(DFSConfigKeys.NNTOP_NUM_USERS_KEY, N_TOP_USERS);
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int period = 2;
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RollingWindowManager rollingWindowManager =
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new RollingWindowManager(config, period);
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rollingWindowManager.recordMetric(0, "op1", users[0], 3);
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checkValues(rollingWindowManager, 0, "op1", 3, 3);
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checkValues(rollingWindowManager, period - 1, "op1", 3, 3);
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checkValues(rollingWindowManager, period, "op1", 0, 0);
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}
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@Test
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public void testTotal() throws Exception {
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Configuration config = new Configuration();
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config.setInt(DFSConfigKeys.NNTOP_BUCKETS_PER_WINDOW_KEY, 1);
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config.setInt(DFSConfigKeys.NNTOP_NUM_USERS_KEY, N_TOP_USERS);
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int period = 10;
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RollingWindowManager rollingWindowManager =
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new RollingWindowManager(config, period);
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long t = 0;
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rollingWindowManager.recordMetric(t, "op1", users[0], 3);
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checkValues(rollingWindowManager, t, "op1", 3, 3);
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// both should have a value.
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t = (long)(period * .5);
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rollingWindowManager.recordMetric(t, "op2", users[0], 4);
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checkValues(rollingWindowManager, t, "op1", 3, 7);
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checkValues(rollingWindowManager, t, "op2", 4, 7);
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// neither should reset.
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t = period - 1;
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checkValues(rollingWindowManager, t, "op1", 3, 7);
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checkValues(rollingWindowManager, t, "op2", 4, 7);
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// op1 should reset in its next period, but not op2.
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t = period;
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rollingWindowManager.recordMetric(10, "op1", users[0], 10);
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checkValues(rollingWindowManager, t, "op1", 10, 14);
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checkValues(rollingWindowManager, t, "op2", 4, 14);
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// neither should reset.
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t = (long)(period * 1.25);
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rollingWindowManager.recordMetric(t, "op2", users[0], 7);
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checkValues(rollingWindowManager, t, "op1", 10, 21);
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checkValues(rollingWindowManager, t, "op2", 11, 21);
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// op2 should reset.
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t = (long)(period * 1.5);
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rollingWindowManager.recordMetric(t, "op2", users[0], 13);
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checkValues(rollingWindowManager, t, "op1", 10, 23);
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checkValues(rollingWindowManager, t, "op2", 13, 23);
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}
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@Test
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public void testWithFuzzing() throws Exception {
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Configuration config = new Configuration();
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config.setInt(DFSConfigKeys.NNTOP_BUCKETS_PER_WINDOW_KEY, 1);
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config.setInt(DFSConfigKeys.NNTOP_NUM_USERS_KEY, N_TOP_USERS);
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int period = users.length/2;
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RollingWindowManager rollingWindowManager =
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new RollingWindowManager(config, period);
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String[] ops = {"op1", "op2", "op3", "op4"};
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Random rand = new Random();
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for (int i=0; i < 10000; i++) {
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rollingWindowManager.recordMetric(i, ops[rand.nextInt(ops.length)],
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users[rand.nextInt(users.length)],
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rand.nextInt(100));
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TopWindow window = rollingWindowManager.snapshot(i);
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checkTotal(window);
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}
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}
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@Test
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public void testOpTotal() throws Exception {
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int numTopUsers = 2;
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Configuration config = new Configuration();
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config.setInt(DFSConfigKeys.NNTOP_BUCKETS_PER_WINDOW_KEY, 1);
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config.setInt(DFSConfigKeys.NNTOP_NUM_USERS_KEY, numTopUsers);
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int period = users.length/2;
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RollingWindowManager rollingWindowManager =
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new RollingWindowManager(config, period);
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int numOps = 3;
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rollingWindowManager.recordMetric(0, "op1", "user1", 10);
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rollingWindowManager.recordMetric(0, "op1", "user2", 20);
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rollingWindowManager.recordMetric(0, "op1", "user3", 30);
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rollingWindowManager.recordMetric(0, "op2", "user1", 1);
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rollingWindowManager.recordMetric(0, "op2", "user4", 40);
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rollingWindowManager.recordMetric(0, "op2", "user5", 50);
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rollingWindowManager.recordMetric(0, "op3", "user6", 1);
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rollingWindowManager.recordMetric(0, "op3", "user7", 11);
|
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rollingWindowManager.recordMetric(0, "op3", "user8", 1);
|
||||
|
||||
TopWindow window = rollingWindowManager.snapshot(0);
|
||||
Assert.assertEquals(numOps + 1, window.getOps().size());
|
||||
|
||||
Op allOp = window.getOps().get(0);
|
||||
Assert.assertEquals(TopConf.ALL_CMDS, allOp.getOpType());
|
||||
List<User> topUsers = allOp.getTopUsers();
|
||||
Assert.assertEquals(numTopUsers * numOps, topUsers.size());
|
||||
// ensure all the top users for each op are present in the total op.
|
||||
for (int i = 1; i < numOps; i++) {
|
||||
Assert.assertTrue(
|
||||
topUsers.containsAll(window.getOps().get(i).getTopUsers()));
|
||||
}
|
||||
}
|
||||
|
||||
private void checkValues(RollingWindowManager rwManager, long time,
|
||||
String opType, long value, long expectedTotal) throws Exception {
|
||||
TopWindow window = rwManager.snapshot(time);
|
||||
for (Op windowOp : window.getOps()) {
|
||||
if (opType.equals(windowOp.getOpType())) {
|
||||
assertEquals(value, windowOp.getTotalCount());
|
||||
break;
|
||||
}
|
||||
}
|
||||
assertEquals(expectedTotal, checkTotal(window));
|
||||
}
|
||||
|
||||
private long checkTotal(TopWindow window) throws Exception {
|
||||
long allOpTotal = 0;
|
||||
long computedOpTotal = 0;
|
||||
|
||||
Map<String, User> userOpTally = new HashMap<>();
|
||||
for (String user : users) {
|
||||
userOpTally.put(user, new User(user, 0));
|
||||
}
|
||||
for (Op windowOp : window.getOps()) {
|
||||
int multiplier;
|
||||
if (TopConf.ALL_CMDS.equals(windowOp.getOpType())) {
|
||||
multiplier = -1;
|
||||
allOpTotal += windowOp.getTotalCount();
|
||||
} else {
|
||||
multiplier = 1;
|
||||
computedOpTotal += windowOp.getTotalCount();
|
||||
}
|
||||
for (User user : windowOp.getAllUsers()) {
|
||||
userOpTally.get(user.getUser()).add((int)(multiplier*user.getCount()));
|
||||
}
|
||||
}
|
||||
assertEquals(allOpTotal, computedOpTotal);
|
||||
for (String user : userOpTally.keySet()) {
|
||||
assertEquals(0, userOpTally.get(user).getCount());
|
||||
}
|
||||
return computedOpTotal;
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue