HADOOP-13146. Refactor RetryInvocationHandler. Contributed by Tsz Wo Nicholas Sze.
This commit is contained in:
Jing Zhao
Tsz-Wo Nicholas Sze
parent
63f73d78a1
commit
03c4491d89
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@ -37,10 +37,21 @@ public interface FailoverProxyProvider<T> extends Closeable {
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* provides information for debugging purposes.
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*/
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public final String proxyInfo;
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public ProxyInfo(T proxy, String proxyInfo) {
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this.proxy = proxy;
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this.proxyInfo = proxyInfo;
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}
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public String getString(String methodName) {
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return proxy.getClass().getSimpleName() + "." + methodName
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+ " over " + proxyInfo;
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}
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@Override
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public String toString() {
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return proxy.getClass().getSimpleName() + " over " + proxyInfo;
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}
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}
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/**
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@ -17,49 +17,137 @@
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*/
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package org.apache.hadoop.io.retry;
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import java.io.IOException;
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import java.lang.reflect.InvocationHandler;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.lang.reflect.Proxy;
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import java.util.Collections;
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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.concurrent.atomic.AtomicLong;
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import com.google.common.annotations.VisibleForTesting;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hadoop.classification.InterfaceAudience;
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import org.apache.hadoop.io.retry.FailoverProxyProvider.ProxyInfo;
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import org.apache.hadoop.io.retry.RetryPolicy.RetryAction;
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import org.apache.hadoop.ipc.Client;
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import org.apache.hadoop.ipc.*;
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import org.apache.hadoop.ipc.Client.ConnectionId;
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import org.apache.hadoop.ipc.ProtocolTranslator;
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import org.apache.hadoop.ipc.RPC;
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import org.apache.hadoop.ipc.RpcConstants;
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import org.apache.hadoop.ipc.RpcInvocationHandler;
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import com.google.common.annotations.VisibleForTesting;
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import java.io.IOException;
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import java.lang.reflect.InvocationHandler;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.lang.reflect.Proxy;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.Map;
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/**
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* This class implements RpcInvocationHandler and supports retry on the client
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* side.
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* A {@link RpcInvocationHandler} which supports client side retry .
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*/
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@InterfaceAudience.Private
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public class RetryInvocationHandler<T> implements RpcInvocationHandler {
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public static final Log LOG = LogFactory.getLog(RetryInvocationHandler.class);
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private final FailoverProxyProvider<T> proxyProvider;
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/**
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* The number of times the associated proxyProvider has ever been failed over.
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*/
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private long proxyProviderFailoverCount = 0;
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private static class Counters {
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/** Counter for retries. */
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private int retries;
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/** Counter for method invocation has been failed over. */
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private int failovers;
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}
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private static class ProxyDescriptor<T> {
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private final FailoverProxyProvider<T> fpp;
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/** Count the associated proxy provider has ever been failed over. */
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private long failoverCount = 0;
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private ProxyInfo<T> proxyInfo;
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ProxyDescriptor(FailoverProxyProvider<T> fpp) {
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this.fpp = fpp;
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this.proxyInfo = fpp.getProxy();
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}
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synchronized ProxyInfo<T> getProxyInfo() {
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return proxyInfo;
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}
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synchronized T getProxy() {
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return proxyInfo.proxy;
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}
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synchronized long getFailoverCount() {
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return failoverCount;
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}
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synchronized void failover(long expectedFailoverCount, Method method) {
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// Make sure that concurrent failed invocations only cause a single
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// actual failover.
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if (failoverCount == expectedFailoverCount) {
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fpp.performFailover(proxyInfo.proxy);
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failoverCount++;
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} else {
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LOG.warn("A failover has occurred since the start of "
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+ proxyInfo.getString(method.getName()));
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}
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proxyInfo = fpp.getProxy();
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}
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boolean idempotentOrAtMostOnce(Method method) throws NoSuchMethodException {
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final Method m = fpp.getInterface()
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.getMethod(method.getName(), method.getParameterTypes());
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return m.isAnnotationPresent(Idempotent.class)
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|| m.isAnnotationPresent(AtMostOnce.class);
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}
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void close() throws IOException {
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fpp.close();
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}
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}
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private static class RetryInfo {
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private final long delay;
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private final RetryAction failover;
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private final RetryAction fail;
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RetryInfo(long delay, RetryAction failover, RetryAction fail) {
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this.delay = delay;
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this.failover = failover;
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this.fail = fail;
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}
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static RetryInfo newRetryInfo(RetryPolicy policy, Exception e,
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Counters counters, boolean idempotentOrAtMostOnce) throws Exception {
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long maxRetryDelay = 0;
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RetryAction failover = null;
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RetryAction retry = null;
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RetryAction fail = null;
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final Iterable<Exception> exceptions = e instanceof MultiException ?
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((MultiException) e).getExceptions().values()
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: Collections.singletonList(e);
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for (Exception exception : exceptions) {
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final RetryAction a = policy.shouldRetry(exception,
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counters.retries, counters.failovers, idempotentOrAtMostOnce);
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if (a.action == RetryAction.RetryDecision.FAIL) {
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fail = a;
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} else {
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// must be a retry or failover
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if (a.action == RetryAction.RetryDecision.FAILOVER_AND_RETRY) {
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failover = a;
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} else {
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retry = a;
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}
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if (a.delayMillis > maxRetryDelay) {
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maxRetryDelay = a.delayMillis;
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}
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}
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}
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return new RetryInfo(maxRetryDelay, failover,
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failover == null && retry == null? fail: null);
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}
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}
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private final ProxyDescriptor<T> proxyDescriptor;
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private volatile boolean hasMadeASuccessfulCall = false;
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private final RetryPolicy defaultPolicy;
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private final Map<String,RetryPolicy> methodNameToPolicyMap;
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private ProxyInfo<T> currentProxy;
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protected RetryInvocationHandler(FailoverProxyProvider<T> proxyProvider,
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RetryPolicy retryPolicy) {
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@ -69,39 +157,40 @@ public class RetryInvocationHandler<T> implements RpcInvocationHandler {
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protected RetryInvocationHandler(FailoverProxyProvider<T> proxyProvider,
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RetryPolicy defaultPolicy,
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Map<String, RetryPolicy> methodNameToPolicyMap) {
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this.proxyProvider = proxyProvider;
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this.proxyDescriptor = new ProxyDescriptor<>(proxyProvider);
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this.defaultPolicy = defaultPolicy;
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this.methodNameToPolicyMap = methodNameToPolicyMap;
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this.currentProxy = proxyProvider.getProxy();
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}
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private RetryPolicy getRetryPolicy(Method method) {
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final RetryPolicy policy = methodNameToPolicyMap.get(method.getName());
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return policy != null? policy: defaultPolicy;
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}
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@Override
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public Object invoke(Object proxy, Method method, Object[] args)
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throws Throwable {
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RetryPolicy policy = methodNameToPolicyMap.get(method.getName());
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if (policy == null) {
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policy = defaultPolicy;
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}
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// The number of times this method invocation has been failed over.
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int invocationFailoverCount = 0;
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final boolean isRpc = isRpcInvocation(currentProxy.proxy);
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throws Throwable {
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final boolean isRpc = isRpcInvocation(proxyDescriptor.getProxy());
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final int callId = isRpc? Client.nextCallId(): RpcConstants.INVALID_CALL_ID;
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int retries = 0;
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return invoke(method, args, isRpc, callId, new Counters());
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}
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private Object invoke(final Method method, final Object[] args,
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final boolean isRpc, final int callId, final Counters counters)
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throws Throwable {
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final RetryPolicy policy = getRetryPolicy(method);
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while (true) {
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// The number of times this invocation handler has ever been failed over,
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// before this method invocation attempt. Used to prevent concurrent
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// failed method invocations from triggering multiple failover attempts.
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long invocationAttemptFailoverCount;
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synchronized (proxyProvider) {
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invocationAttemptFailoverCount = proxyProviderFailoverCount;
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}
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final long failoverCount = proxyDescriptor.getFailoverCount();
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if (isRpc) {
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Client.setCallIdAndRetryCount(callId, retries);
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Client.setCallIdAndRetryCount(callId, counters.retries);
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}
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try {
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Object ret = invokeMethod(method, args);
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final Object ret = invokeMethod(method, args);
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hasMadeASuccessfulCall = true;
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return ret;
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} catch (Exception ex) {
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@ -109,153 +198,74 @@ public class RetryInvocationHandler<T> implements RpcInvocationHandler {
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// If interrupted, do not retry.
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throw ex;
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}
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boolean isIdempotentOrAtMostOnce = proxyProvider.getInterface()
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.getMethod(method.getName(), method.getParameterTypes())
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.isAnnotationPresent(Idempotent.class);
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if (!isIdempotentOrAtMostOnce) {
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isIdempotentOrAtMostOnce = proxyProvider.getInterface()
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.getMethod(method.getName(), method.getParameterTypes())
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.isAnnotationPresent(AtMostOnce.class);
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}
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List<RetryAction> actions = extractActions(policy, ex, retries++,
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invocationFailoverCount, isIdempotentOrAtMostOnce);
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RetryAction failAction = getFailAction(actions);
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if (failAction != null) {
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// fail.
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if (failAction.reason != null) {
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LOG.warn("Exception while invoking " + currentProxy.proxy.getClass()
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+ "." + method.getName() + " over " + currentProxy.proxyInfo
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+ ". Not retrying because " + failAction.reason, ex);
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}
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throw ex;
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} else { // retry or failover
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// avoid logging the failover if this is the first call on this
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// proxy object, and we successfully achieve the failover without
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// any flip-flopping
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boolean worthLogging =
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!(invocationFailoverCount == 0 && !hasMadeASuccessfulCall);
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worthLogging |= LOG.isDebugEnabled();
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RetryAction failOverAction = getFailOverAction(actions);
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long delay = getDelayMillis(actions);
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if (worthLogging) {
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String msg = "Exception while invoking " + method.getName()
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+ " of class " + currentProxy.proxy.getClass().getSimpleName()
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+ " over " + currentProxy.proxyInfo;
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if (invocationFailoverCount > 0) {
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msg += " after " + invocationFailoverCount + " fail over attempts";
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}
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if (failOverAction != null) {
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// failover
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msg += ". Trying to fail over " + formatSleepMessage(delay);
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} else {
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// retry
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msg += ". Retrying " + formatSleepMessage(delay);
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}
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LOG.info(msg, ex);
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}
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if (delay > 0) {
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Thread.sleep(delay);
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}
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if (failOverAction != null) {
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// Make sure that concurrent failed method invocations only cause a
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// single actual fail over.
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synchronized (proxyProvider) {
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if (invocationAttemptFailoverCount == proxyProviderFailoverCount) {
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proxyProvider.performFailover(currentProxy.proxy);
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proxyProviderFailoverCount++;
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} else {
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LOG.warn("A failover has occurred since the start of this method"
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+ " invocation attempt.");
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}
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currentProxy = proxyProvider.getProxy();
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}
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invocationFailoverCount++;
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}
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}
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handleException(method, policy, failoverCount, counters, ex);
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}
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}
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}
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/**
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* Obtain a retry delay from list of RetryActions.
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*/
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private long getDelayMillis(List<RetryAction> actions) {
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long retVal = 0;
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for (RetryAction action : actions) {
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if (action.action == RetryAction.RetryDecision.FAILOVER_AND_RETRY ||
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action.action == RetryAction.RetryDecision.RETRY) {
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if (action.delayMillis > retVal) {
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retVal = action.delayMillis;
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}
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private void handleException(final Method method, final RetryPolicy policy,
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final long expectedFailoverCount, final Counters counters,
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final Exception ex) throws Exception {
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final RetryInfo retryInfo = RetryInfo.newRetryInfo(policy, ex, counters,
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proxyDescriptor.idempotentOrAtMostOnce(method));
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counters.retries++;
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if (retryInfo.fail != null) {
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// fail.
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if (retryInfo.fail.reason != null) {
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LOG.warn("Exception while invoking "
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+ proxyDescriptor.getProxyInfo().getString(method.getName())
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+ ". Not retrying because " + retryInfo.fail.reason, ex);
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}
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throw ex;
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}
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// retry
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final boolean isFailover = retryInfo.failover != null;
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log(method, isFailover, counters.failovers, retryInfo.delay, ex);
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if (retryInfo.delay > 0) {
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Thread.sleep(retryInfo.delay);
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}
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if (isFailover) {
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proxyDescriptor.failover(expectedFailoverCount, method);
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counters.failovers++;
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}
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return retVal;
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}
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/**
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* Return the first FAILOVER_AND_RETRY action.
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*/
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private RetryAction getFailOverAction(List<RetryAction> actions) {
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for (RetryAction action : actions) {
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if (action.action == RetryAction.RetryDecision.FAILOVER_AND_RETRY) {
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return action;
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}
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private void log(final Method method, final boolean isFailover,
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final int failovers, final long delay, final Exception ex) {
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// log info if this has made some successful calls or
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// this is not the first failover
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final boolean info = hasMadeASuccessfulCall || failovers != 0;
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if (!info && !LOG.isDebugEnabled()) {
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return;
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}
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return null;
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}
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/**
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* Return the last FAIL action.. only if there are no RETRY actions.
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*/
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private RetryAction getFailAction(List<RetryAction> actions) {
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RetryAction fAction = null;
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for (RetryAction action : actions) {
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if (action.action == RetryAction.RetryDecision.FAIL) {
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fAction = action;
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} else {
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// Atleast 1 RETRY
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return null;
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}
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final StringBuilder b = new StringBuilder()
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.append("Exception while invoking ")
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.append(proxyDescriptor.getProxyInfo().getString(method.getName()));
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if (failovers > 0) {
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b.append(" after ").append(failovers).append(" failover attempts");
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}
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return fAction;
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}
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b.append(isFailover? ". Trying to failover ": ". Retrying ");
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b.append(delay > 0? "after sleeping for " + delay + "ms.": "immediately.");
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private List<RetryAction> extractActions(RetryPolicy policy, Exception ex,
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int i, int invocationFailoverCount,
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boolean isIdempotentOrAtMostOnce)
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throws Exception {
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List<RetryAction> actions = new LinkedList<>();
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if (ex instanceof MultiException) {
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for (Exception th : ((MultiException) ex).getExceptions().values()) {
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actions.add(policy.shouldRetry(th, i, invocationFailoverCount,
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isIdempotentOrAtMostOnce));
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}
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if (info) {
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LOG.info(b.toString(), ex);
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} else {
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actions.add(policy.shouldRetry(ex, i,
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invocationFailoverCount, isIdempotentOrAtMostOnce));
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LOG.debug(b.toString(), ex);
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}
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return actions;
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}
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private static String formatSleepMessage(long millis) {
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if (millis > 0) {
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return "after sleeping for " + millis + "ms.";
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} else {
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return "immediately.";
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}
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}
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protected Object invokeMethod(Method method, Object[] args) throws Throwable {
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try {
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if (!method.isAccessible()) {
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method.setAccessible(true);
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}
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return method.invoke(currentProxy.proxy, args);
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return method.invoke(proxyDescriptor.getProxy(), args);
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} catch (InvocationTargetException e) {
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throw e.getCause();
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}
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@ -275,12 +285,11 @@ public class RetryInvocationHandler<T> implements RpcInvocationHandler {
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@Override
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public void close() throws IOException {
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proxyProvider.close();
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proxyDescriptor.close();
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}
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@Override //RpcInvocationHandler
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public ConnectionId getConnectionId() {
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return RPC.getConnectionIdForProxy(currentProxy.proxy);
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return RPC.getConnectionIdForProxy(proxyDescriptor.getProxy());
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}
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}
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@ -18,55 +18,32 @@
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package org.apache.hadoop.io.retry;
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import static org.apache.hadoop.io.retry.RetryPolicies.RETRY_FOREVER;
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import static org.apache.hadoop.io.retry.RetryPolicies.TRY_ONCE_THEN_FAIL;
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import static org.apache.hadoop.io.retry.RetryPolicies.retryByException;
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import static org.apache.hadoop.io.retry.RetryPolicies.retryByRemoteException;
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import static org.apache.hadoop.io.retry.RetryPolicies.retryOtherThanRemoteException;
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import static org.apache.hadoop.io.retry.RetryPolicies.retryUpToMaximumCountWithFixedSleep;
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import static org.apache.hadoop.io.retry.RetryPolicies.retryUpToMaximumCountWithProportionalSleep;
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import static org.apache.hadoop.io.retry.RetryPolicies.retryUpToMaximumTimeWithFixedSleep;
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import static org.apache.hadoop.io.retry.RetryPolicies.retryForeverWithFixedSleep;
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||||
import static org.apache.hadoop.io.retry.RetryPolicies.exponentialBackoffRetry;
|
||||
|
||||
import static org.mockito.Matchers.any;
|
||||
import static org.mockito.Matchers.anyBoolean;
|
||||
import static org.mockito.Matchers.anyInt;
|
||||
import static org.mockito.Mockito.mock;
|
||||
import static org.mockito.Mockito.times;
|
||||
import static org.mockito.Mockito.verify;
|
||||
import static org.mockito.Mockito.when;
|
||||
|
||||
import static org.junit.Assert.*;
|
||||
|
||||
import java.io.IOException;
|
||||
import java.util.Collections;
|
||||
import java.util.Map;
|
||||
import java.util.concurrent.Callable;
|
||||
import java.util.concurrent.CountDownLatch;
|
||||
import java.util.concurrent.ExecutorService;
|
||||
import java.util.concurrent.Executors;
|
||||
import java.util.concurrent.Future;
|
||||
import java.util.concurrent.TimeUnit;
|
||||
import java.util.concurrent.atomic.AtomicReference;
|
||||
|
||||
import org.apache.hadoop.io.retry.RetryPolicies.*;
|
||||
import org.apache.hadoop.io.retry.RetryPolicy.RetryAction;
|
||||
import org.apache.hadoop.io.retry.RetryPolicy.RetryAction.RetryDecision;
|
||||
import org.apache.hadoop.io.retry.RetryPolicies.RetryUpToMaximumCountWithFixedSleep;
|
||||
import org.apache.hadoop.io.retry.RetryPolicies.RetryUpToMaximumTimeWithFixedSleep;
|
||||
import org.apache.hadoop.io.retry.RetryPolicies.TryOnceThenFail;
|
||||
import org.apache.hadoop.io.retry.UnreliableInterface.FatalException;
|
||||
import org.apache.hadoop.io.retry.UnreliableInterface.UnreliableException;
|
||||
import org.apache.hadoop.ipc.ProtocolTranslator;
|
||||
import org.apache.hadoop.ipc.RemoteException;
|
||||
|
||||
import org.junit.Before;
|
||||
import org.junit.Test;
|
||||
import org.mockito.invocation.InvocationOnMock;
|
||||
import org.mockito.stubbing.Answer;
|
||||
|
||||
import org.junit.Before;
|
||||
import org.junit.Test;
|
||||
|
||||
import java.io.IOException;
|
||||
import java.lang.reflect.UndeclaredThrowableException;
|
||||
import java.util.Collections;
|
||||
import java.util.Map;
|
||||
import java.util.concurrent.*;
|
||||
import java.util.concurrent.atomic.AtomicInteger;
|
||||
import java.util.concurrent.atomic.AtomicReference;
|
||||
|
||||
import static org.apache.hadoop.io.retry.RetryPolicies.*;
|
||||
import static org.junit.Assert.*;
|
||||
import static org.mockito.Matchers.any;
|
||||
import static org.mockito.Matchers.anyBoolean;
|
||||
import static org.mockito.Matchers.anyInt;
|
||||
import static org.mockito.Mockito.*;
|
||||
|
||||
public class TestRetryProxy {
|
||||
|
||||
|
|
@ -131,25 +108,21 @@ public class TestRetryProxy {
|
|||
final UnreliableInterface unreliable = (UnreliableInterface)
|
||||
RetryProxy.create(UnreliableInterface.class, unreliableImpl, RETRY_FOREVER);
|
||||
assertTrue(RetryInvocationHandler.isRpcInvocation(unreliable));
|
||||
|
||||
|
||||
final AtomicInteger count = new AtomicInteger();
|
||||
// Embed the proxy in ProtocolTranslator
|
||||
ProtocolTranslator xlator = new ProtocolTranslator() {
|
||||
int count = 0;
|
||||
@Override
|
||||
public Object getUnderlyingProxyObject() {
|
||||
count++;
|
||||
count.getAndIncrement();
|
||||
return unreliable;
|
||||
}
|
||||
@Override
|
||||
public String toString() {
|
||||
return "" + count;
|
||||
}
|
||||
};
|
||||
|
||||
// For a proxy wrapped in ProtocolTranslator method should return true
|
||||
assertTrue(RetryInvocationHandler.isRpcInvocation(xlator));
|
||||
// Ensure underlying proxy was looked at
|
||||
assertEquals(xlator.toString(), "1");
|
||||
assertEquals(1, count.get());
|
||||
|
||||
// For non-proxy the method must return false
|
||||
assertFalse(RetryInvocationHandler.isRpcInvocation(new Object()));
|
||||
|
|
|
|||
Loading…
Reference in New Issue