use a retry handler with retryCount=0 because we usually expect requests

to fail if we access non-permanently available resources (peers, web
pages) and want to fail fast without repeating the same request which is
doomed to fail. The previous appearance of http client connection had a
1-2-4-8-second timeout scheme, which caused that connection attempts
lasted for 16 seconds.

source/net/yacy/cora/federate/solr/instance/RemoteInstance.java

@@ -51,6 +51,7 @@ import org.apache.http.impl.auth.BasicScheme;
 import org.apache.http.impl.client.BasicAuthCache;
 import org.apache.http.impl.client.BasicCredentialsProvider;
 import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
 import org.apache.http.impl.conn.PoolingClientConnectionManager;
 import org.apache.http.protocol.HttpContext;
 import org.apache.solr.client.solrj.SolrServer;
@@ -140,6 +141,7 @@ public class RemoteInstance implements SolrInstance {
                     HttpHost targetHost = new HttpHost(u.getHost(), u.getPort(), u.getProtocol());
                     authCache.put(targetHost, basicAuth);
                     context.setAttribute(ClientContext.AUTH_CACHE, authCache);
+                    this.setHttpRequestRetryHandler(new DefaultHttpRequestRetryHandler(0, false)); // no retries needed; we expect connections to fail; therefore we should not retry
                     return context;
                 }
             };

source/net/yacy/cora/protocol/http/HTTPClient.java

@@ -84,6 +84,7 @@ import org.apache.http.entity.mime.content.ContentBody;
 import org.apache.http.entity.mime.content.StringBody;
 import org.apache.http.impl.client.BasicCredentialsProvider;
 import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
 import org.apache.http.impl.conn.PoolingClientConnectionManager;
 import org.apache.http.message.BasicHeaderElementIterator;
 import org.apache.http.params.BasicHttpParams;
@@ -197,7 +198,8 @@ public class HTTPClient {
 		((DefaultHttpClient) httpClient).addRequestInterceptor(new GzipRequestInterceptor());
 		// uncompress gzip
 		((DefaultHttpClient) httpClient).addResponseInterceptor(new GzipResponseInterceptor());
-
+		// remove retries; we expect connections to fail; therefore we should not retry
+		((DefaultHttpClient) httpClient).setHttpRequestRetryHandler(new DefaultHttpRequestRetryHandler(0, false));
 		if (idledConnectionEvictor == null) {
 		    idledConnectionEvictor = new IdledConnectionEvictor(clientConnectionManager);
 		    idledConnectionEvictor.start();