SOLR-8450: Our HttpClient retry policy is too permissive.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1723616 13f79535-47bb-0310-9956-ffa450edef68

solr/solrj/src/java/org/apache/solr/client/solrj/impl/HttpClientUtil.java

@@ -263,12 +263,7 @@ public class HttpClientUtil {
     } else {
       // if the request is not fully sent, we retry
       // streaming updates are not a problem, because they are not retryable
-      httpClient.setHttpRequestRetryHandler(new DefaultHttpRequestRetryHandler(){
-        @Override
-        protected boolean handleAsIdempotent(final HttpRequest request) {
-          return false; // we can't tell if a Solr request is idempotent
-        }
-      });
+      httpClient.setHttpRequestRetryHandler(new SolrHttpRequestRetryHandler(3));
     }
   }
 

solr/solrj/src/java/org/apache/solr/client/solrj/impl/SolrHttpRequestRetryHandler.java

@@ -0,0 +1,157 @@
+package org.apache.solr.client.solrj.impl;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.io.IOException;
+import java.io.InterruptedIOException;
+import java.lang.invoke.MethodHandles;
+import java.net.ConnectException;
+import java.net.UnknownHostException;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+
+import javax.net.ssl.SSLException;
+
+import org.apache.http.HttpRequest;
+import org.apache.http.client.HttpRequestRetryHandler;
+import org.apache.http.client.methods.HttpUriRequest;
+import org.apache.http.client.protocol.HttpClientContext;
+import org.apache.http.impl.client.RequestWrapper;
+import org.apache.http.protocol.HttpContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class SolrHttpRequestRetryHandler implements HttpRequestRetryHandler {
+  
+  private static final String GET = "GET";
+
+  private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+  
+  public static final SolrHttpRequestRetryHandler INSTANCE = new SolrHttpRequestRetryHandler();
+  
+  /** the number of times a method will be retried */
+  private final int retryCount;
+  
+  private final Set<Class<? extends IOException>> nonRetriableClasses;
+  
+  /**
+   * Create the request retry handler using the specified IOException classes
+   *
+   * @param retryCount
+   *          how many times to retry; 0 means no retries
+   *          true if it's OK to retry requests that have been sent
+   * @param clazzes
+   *          the IOException types that should not be retried
+   */
+  protected SolrHttpRequestRetryHandler(final int retryCount, final Collection<Class<? extends IOException>> clazzes) {
+    super();
+    this.retryCount = retryCount;
+    this.nonRetriableClasses = new HashSet<Class<? extends IOException>>();
+    for (final Class<? extends IOException> clazz : clazzes) {
+      this.nonRetriableClasses.add(clazz);
+    }
+  }
+  
+  /**
+   * Create the request retry handler using the following list of non-retriable IOException classes: <br>
+   * <ul>
+   * <li>InterruptedIOException</li>
+   * <li>UnknownHostException</li>
+   * <li>ConnectException</li>
+   * <li>SSLException</li>
+   * </ul>
+   * 
+   * @param retryCount
+   *          how many times to retry; 0 means no retries
+   *          true if it's OK to retry non-idempotent requests that have been sent
+   */
+  @SuppressWarnings("unchecked")
+  public SolrHttpRequestRetryHandler(final int retryCount) {
+    this(retryCount, Arrays.asList(InterruptedIOException.class, UnknownHostException.class,
+        ConnectException.class, SSLException.class));
+  }
+  
+  /**
+   * Create the request retry handler with a retry count of 3, requestSentRetryEnabled false and using the following
+   * list of non-retriable IOException classes: <br>
+   * <ul>
+   * <li>InterruptedIOException</li>
+   * <li>UnknownHostException</li>
+   * <li>ConnectException</li>
+   * <li>SSLException</li>
+   * </ul>
+   */
+  public SolrHttpRequestRetryHandler() {
+    this(3);
+  }
+  
+  @Override
+  public boolean retryRequest(final IOException exception, final int executionCount, final HttpContext context) {
+    log.debug("Retry http request {} out of {}", executionCount, this.retryCount);
+    if (executionCount > this.retryCount) {
+      log.debug("Do not retry, over max retry count");
+      return false;
+    }
+    if (this.nonRetriableClasses.contains(exception.getClass())) {
+      log.debug("Do not retry, non retriable class {}" + exception.getClass());
+      return false;
+    } else {
+      for (final Class<? extends IOException> rejectException : this.nonRetriableClasses) {
+        if (rejectException.isInstance(exception)) {
+          log.debug("Do not retry, non retriable class {}" + exception.getClass());
+          return false;
+        }
+      }
+    }
+    final HttpClientContext clientContext = HttpClientContext.adapt(context);
+    final HttpRequest request = clientContext.getRequest();
+    
+    if (requestIsAborted(request)) {
+      log.debug("Do not retry, request was aborted");
+      return false;
+    }
+    
+    if (handleAsIdempotent(clientContext)) {
+      log.debug("Retry, request should be idempotent");
+      return true;
+    }
+
+    log.debug("Do not retry, no rules matched");
+    return false;
+  }
+  
+  public int getRetryCount() {
+    return retryCount;
+  }
+  
+  protected boolean handleAsIdempotent(final HttpClientContext context) {
+    String method = context.getRequest().getRequestLine().getMethod();
+    return method.equals(GET);
+  }
+  
+  protected boolean requestIsAborted(final HttpRequest request) {
+    HttpRequest req = request;
+    if (request instanceof RequestWrapper) { // does not forward request to original
+      req = ((RequestWrapper) request).getOriginal();
+    }
+    return (req instanceof HttpUriRequest && ((HttpUriRequest) req).isAborted());
+  }
+  
+}