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Use a common pooled http connection manager for remote solr instances

For a better control on the maximum simultaneous outgoing http
connections, as already done for any other http connections (crawls, rwi
search, p2p protocol) using the net.yacy.cora.protocol.http.HTTPClient
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luccioman committed May 29, 2018
1 parent d28f9ba commit ee6670fb8f8c197059fcc27d236bcccfe7238b72
@@ -43,6 +43,7 @@
import org.apache.http.client.AuthCache;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.GzipDecompressingEntity;
import org.apache.http.client.protocol.ClientContext;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
@@ -55,6 +56,8 @@
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.solr.client.solrj.SolrClient;
import org.apache.solr.client.solrj.impl.ConcurrentUpdateSolrClient;
import org.apache.solr.client.solrj.impl.HttpClientUtil;
import org.apache.solr.common.params.ModifiableSolrParams;

import net.yacy.cora.document.id.MultiProtocolURL;
import net.yacy.cora.protocol.HeaderFramework;
@@ -64,8 +67,17 @@
import net.yacy.search.schema.CollectionSchema;
import net.yacy.search.schema.WebgraphSchema;

/**
* Handle access to a remote Solr instance.
*/
@SuppressWarnings("deprecation")
public class RemoteInstance implements SolrInstance {

/** The connection manager used to handle the common HTTP connections pool. */
private static final org.apache.http.impl.conn.PoolingClientConnectionManager CONNECTION_MANAGER = buildConnectionManager();

/** A custom scheme registry allowing https connections to servers using self-signed certificate */
private static final SchemeRegistry SCHEME_REGISTRY = buildTrustSelfSignedSchemeRegistry();

private String solrurl;
private final HttpClient client;
@@ -176,52 +188,71 @@ public RemoteInstance(final String url, final Collection<String> coreNames, fina
/* Here we must trust self-signed certificates as most peers with SSL enabled use such certificates */
this.client = buildCustomHttpClient(timeout, u, solraccount, solrpw, host, true);
} else {
// The default HttpSolrClient will be used
this.client = null;
/* Build a http client the Solr utils as in the HttpSolrClient constructor implementation.
* The only difference is that the common connection manager is used and configured in the buildConnectionManager() function */
final ModifiableSolrParams params = new ModifiableSolrParams();
params.set(HttpClientUtil.PROP_FOLLOW_REDIRECTS, false);
this.client = HttpClientUtil.createClient(params, CONNECTION_MANAGER);
}

this.defaultServer = (ConcurrentUpdateSolrClient) getServer(this.defaultCoreName);
if (this.defaultServer == null) throw new IOException("cannot connect to url " + url + " and connect core " + defaultCoreName);
}

/**
* @return a connection manager with a HTTP connection pool
*/
private static org.apache.http.impl.conn.PoolingClientConnectionManager buildConnectionManager() {
/* Important note : use of deprecated Apache classes is required because SolrJ still use them internally (see HttpClientUtil).
* Upgrade only when Solr implementation will become compatible */

org.apache.http.impl.conn.PoolingClientConnectionManager cm;

cm = new org.apache.http.impl.conn.PoolingClientConnectionManager(); // try also: ThreadSafeClientConnManager

cm.setMaxTotal(100);
cm.setDefaultMaxPerRoute(100);
return cm;
}

/**
* @return a custom scheme registry allowing https connections to servers using
* a self-signed certificate
*/
private static SchemeRegistry buildTrustSelfSignedSchemeRegistry() {
/* Important note : use of deprecated Apache classes is required because SolrJ still use them internally (see HttpClientUtil).
* Upgrade only when Solr implementation will become compatible */
SchemeRegistry registry = null;
SSLContext sslContext;
try {
sslContext = SSLContextBuilder.create().loadTrustMaterial(TrustSelfSignedStrategy.INSTANCE).build();
registry = new SchemeRegistry();
registry.register(new Scheme("http", 80, PlainSocketFactory.getSocketFactory()));
registry.register(
new Scheme("https", 443, new SSLSocketFactory(sslContext, AllowAllHostnameVerifier.INSTANCE)));
} catch (final Exception e) {
// Should not happen
ConcurrentLog.warn("RemoteInstance",
"Error when initializing SSL context trusting self-signed certificates.", e);
registry = null;
}
return registry;
}

/**
* @param solraccount eventual user name used to authenticate on the target Solr
* @param solraccount eventual password used to authenticate on the target Solr
* @param trustSelfSignedCertificates when true, https connections to an host rpviding a self-signed certificate are accepted
* @param trustSelfSignedCertificates when true, https connections to an host providing a self-signed certificate are accepted
* @return a new apache HttpClient instance usable as a custom http client by SolrJ
*/
private static HttpClient buildCustomHttpClient(final int timeout, final MultiProtocolURL u, final String solraccount, final String solrpw,
final String host, final boolean trustSelfSignedCertificates) {

/* Important note : deprecated use of Apache classes is required because SolrJ still use them internally (see HttpClientUtil).
/* Important note : use of deprecated Apache classes is required because SolrJ still use them internally (see HttpClientUtil).
* Upgrade only when Solr implementation will become compatible */

org.apache.http.impl.conn.PoolingClientConnectionManager cm;
SchemeRegistry registry = null;
if(trustSelfSignedCertificates) {
SSLContext sslContext;
try {
sslContext = SSLContextBuilder.create().loadTrustMaterial(TrustSelfSignedStrategy.INSTANCE).build();
registry = new SchemeRegistry();
registry.register(
new Scheme("http", 80, PlainSocketFactory.getSocketFactory()));
registry.register(
new Scheme("https", 443, new SSLSocketFactory(sslContext, AllowAllHostnameVerifier.INSTANCE)));
} catch (final Exception e) {
// Should not happen
ConcurrentLog.warn("RemoteInstance", "Error when initializing SSL context trusting self-signed certificates.", e);
registry = null;
}
}
if(registry != null) {
cm = new org.apache.http.impl.conn.PoolingClientConnectionManager(registry);
} else {
cm = new org.apache.http.impl.conn.PoolingClientConnectionManager(); // try also: ThreadSafeClientConnManager
}
cm.setMaxTotal(100);
cm.setDefaultMaxPerRoute(100);

org.apache.http.impl.client.DefaultHttpClient result = new org.apache.http.impl.client.DefaultHttpClient(cm) {
org.apache.http.impl.client.DefaultHttpClient result = new org.apache.http.impl.client.DefaultHttpClient(CONNECTION_MANAGER) {
@Override
protected HttpContext createHttpContext() {
HttpContext context = super.createHttpContext();
@@ -230,6 +261,9 @@ protected HttpContext createHttpContext() {
HttpHost targetHost = new HttpHost(u.getHost(), u.getPort(), u.getProtocol());
authCache.put(targetHost, basicAuth);
context.setAttribute(org.apache.http.client.protocol.HttpClientContext.AUTH_CACHE, authCache);
if (trustSelfSignedCertificates && SCHEME_REGISTRY != null) {
context.setAttribute(ClientContext.SCHEME_REGISTRY, SCHEME_REGISTRY);
}
this.setHttpRequestRetryHandler(new org.apache.http.impl.client.DefaultHttpRequestRetryHandler(0, false)); // no retries needed; we expect connections to fail; therefore we should not retry
return context;
}
@@ -356,7 +390,7 @@ public SolrClient getServer(String name) {
}
ConcurrentUpdateSolrClient.Builder builder = new ConcurrentUpdateSolrClient.Builder(solrServerURL);
builder.withHttpClient(this.client);
builder.withQueueSize(10);
builder.withQueueSize(queueSizeByMemory());
builder.withThreadCount(Runtime.getRuntime().availableProcessors());
s = builder.build();
} else {
@@ -376,10 +410,31 @@ public SolrClient getServer(String name) {
return s;
}

@Override
public void close() {
if (this.client != null) ((org.apache.http.impl.client.DefaultHttpClient) this.client).getConnectionManager().shutdown();
}
/**
* Closes each eventually open Solr client and its associated resources. The
* common connections manager is not closed here as it will be reused for other
* RemoteInstances. The shutdown the connection manager at YaCy shutdown, use
* the {@link #closeConnectionManager()} function.
*/
@Override
public void close() {
for (final ConcurrentUpdateSolrClient solrClient : this.server.values()) {
/*
* Close every open Solr client : this is important as it shutdowns client's
* internal asynchronous tasks executor. To release the common connection
* manager, see closeConnectionManager().
*/
solrClient.close();
}
}

/**
* Shutdown the connection manager and close all its active and inactive HTTP
* connections. Must be called at the end of the application.
*/
public static void closeConnectionManager() {
CONNECTION_MANAGER.shutdown();
}

public static int queueSizeByMemory() {
return (int) Math.min(30, Math.max(1, MemoryControl.maxMemory() / 1024 / 1024 / 12));
@@ -2001,6 +2001,7 @@ public synchronized void close() {
} catch (final InterruptedException e ) {
ConcurrentLog.logException(e);
}
RemoteInstance.closeConnectionManager();
this.log.config("SWITCHBOARD SHUTDOWN TERMINATED");
/* Print also to the standard output : when this method is triggered by the shutdown hook thread, the LogManager is likely to have
* been concurrently reset by its own shutdown hook thread */
@@ -56,6 +56,7 @@
import net.yacy.cora.document.encoding.UTF8;
import net.yacy.cora.document.id.DigestURL;
import net.yacy.cora.document.id.MultiProtocolURL;
import net.yacy.cora.federate.solr.instance.RemoteInstance;
import net.yacy.cora.federate.yacy.CacheStrategy;
import net.yacy.cora.order.Digest;
import net.yacy.cora.protocol.ClientIdentification;
@@ -621,6 +622,8 @@ private static void submitPostURL(final File homePath, final String path, final
} catch (final InterruptedException e1) {
e1.printStackTrace();
}

RemoteInstance.closeConnectionManager();

System.exit(-1);
}
@@ -632,6 +635,7 @@ private static void submitPostURL(final File homePath, final String path, final
} catch (final InterruptedException e1) {
e1.printStackTrace();
}
RemoteInstance.closeConnectionManager();

System.exit(-1);
}
@@ -641,6 +645,7 @@ private static void submitPostURL(final File homePath, final String path, final
} catch (final InterruptedException e) {
e.printStackTrace();
}
RemoteInstance.closeConnectionManager();

// finished
ConcurrentLog.config("COMMAND-STEERING", "SUCCESSFULLY FINISHED COMMAND: " + processdescription);
@@ -678,6 +683,7 @@ private static void submitURL(final File homePath, final String path, final Stri
} catch (final InterruptedException e) {
e.printStackTrace();
}
RemoteInstance.closeConnectionManager();

// finished
ConcurrentLog.config("COMMAND-STEERING", "SUCCESSFULLY FINISHED COMMAND: " + processdescription);

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