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Watcher: Increase HttpClient parallel sent requests (#30130)
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The HTTPClient used in watcher is based on the apache http client. The
current client is using a lot of defaults - which are not always
optimal. Two of those defaults are the maximum number of total
connections and the maximum number of connections to a single route.

If one of those limits is reached, the HTTPClient waits for a connection
to be finished thus acting in a blocking fashion. In order to prevent
this when many requests are being executed, we increase the limit of
total connections as well as the connections per route (a route is
basically an endpoint, which also contains proxy information, not
containing an URL, just hosts).

On top of that an additional option has been set to evict
long running connections, which can potentially be reused after some
time. As this requires an additional background thread, this required
some changes to ensure that the httpclient is closed properly. Also the
timeout for this can be configured.
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@spinscale
spinscale committed May 9, 2018
1 parent ae5ac44 commit 28cc588
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Showing 7 changed files with 132 additions and 88 deletions.
8 changes: 8 additions & 0 deletions docs/CHANGELOG.asciidoc
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Expand Up @@ -320,6 +320,14 @@ these instead of the multi-argument versions. ({pull}29623[#29623])

Recovery::
* Require translogUUID when reading global checkpoint {pull}28587[#28587] (issue: {issue}28435[#28435])
Watcher HTTP client used in watches now allows more parallel connections to the
same endpoint and evicts long running connections. ({pull}30130[#30130])

The cluster state listener to decide if watcher should be
stopped/started/paused now runs far less code in an executor but is more
synchronous and predictable. Also the trigger engine thread is only started on
data nodes. And the Execute Watch API can be triggered regardless is watcher is
started or stopped. ({pull}30118[#30118])

Added put index template API to the high level rest client ({pull}30400[#30400])

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9 changes: 8 additions & 1 deletion ...lugin/core/src/test/java/org/elasticsearch/xpack/core/LocalStateCompositeXPackPlugin.java
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Expand Up @@ -28,6 +28,7 @@
import org.elasticsearch.common.util.PageCacheRecycler;
import org.elasticsearch.common.util.concurrent.ThreadContext;
import org.elasticsearch.common.xcontent.NamedXContentRegistry;
import org.elasticsearch.core.internal.io.IOUtils;
import org.elasticsearch.env.Environment;
import org.elasticsearch.env.NodeEnvironment;
import org.elasticsearch.http.HttpServerTransport;
Expand All @@ -38,6 +39,7 @@
import org.elasticsearch.ingest.Processor;
import org.elasticsearch.license.LicenseService;
import org.elasticsearch.license.XPackLicenseState;
import org.elasticsearch.persistent.PersistentTasksExecutor;
import org.elasticsearch.plugins.ActionPlugin;
import org.elasticsearch.plugins.AnalysisPlugin;
import org.elasticsearch.plugins.ClusterPlugin;
Expand All @@ -57,9 +59,9 @@
import org.elasticsearch.transport.Transport;
import org.elasticsearch.transport.TransportInterceptor;
import org.elasticsearch.watcher.ResourceWatcherService;
import org.elasticsearch.persistent.PersistentTasksExecutor;
import org.elasticsearch.xpack.core.ssl.SSLService;

import java.io.IOException;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Collection;
Expand Down Expand Up @@ -391,6 +393,11 @@ public List<PersistentTasksExecutor<?>> getPersistentTasksExecutor(ClusterServic
.collect(toList());
}

@Override
public void close() throws IOException {
IOUtils.close(plugins);
}

private <T> List<T> filterPlugins(Class<T> type) {
return plugins.stream().filter(x -> type.isAssignableFrom(x.getClass())).map(p -> ((T)p))
.collect(Collectors.toList());
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9 changes: 8 additions & 1 deletion x-pack/plugin/watcher/src/main/java/org/elasticsearch/xpack/watcher/Watcher.java
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Expand Up @@ -30,6 +30,7 @@
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.util.concurrent.EsExecutors;
import org.elasticsearch.common.xcontent.NamedXContentRegistry;
import org.elasticsearch.core.internal.io.IOUtils;
import org.elasticsearch.env.Environment;
import org.elasticsearch.env.NodeEnvironment;
import org.elasticsearch.index.IndexModule;
Expand Down Expand Up @@ -219,6 +220,7 @@ public class Watcher extends Plugin implements ActionPlugin, ScriptPlugin {

private static final Logger logger = Loggers.getLogger(Watcher.class);
private WatcherIndexingListener listener;
private HttpClient httpClient;

// public List<NamedWriteableRegistry.Entry> getNamedWriteables() {
// List<NamedWriteableRegistry.Entry> entries = new ArrayList<>();
Expand Down Expand Up @@ -285,7 +287,7 @@ public Collection<Object> createComponents(Client client, ClusterService cluster
// TODO: add more auth types, or remove this indirection
HttpAuthRegistry httpAuthRegistry = new HttpAuthRegistry(httpAuthFactories);
HttpRequestTemplate.Parser httpTemplateParser = new HttpRequestTemplate.Parser(httpAuthRegistry);
final HttpClient httpClient = new HttpClient(settings, httpAuthRegistry, getSslService());
httpClient = new HttpClient(settings, httpAuthRegistry, getSslService());

// notification
EmailService emailService = new EmailService(settings, cryptoService, clusterService.getClusterSettings());
Expand Down Expand Up @@ -630,4 +632,9 @@ public List<BootstrapCheck> getBootstrapChecks() {
public List<ScriptContext> getContexts() {
return Arrays.asList(Watcher.SCRIPT_SEARCH_CONTEXT, Watcher.SCRIPT_EXECUTABLE_CONTEXT, Watcher.SCRIPT_TEMPLATE_CONTEXT);
}

@Override
public void close() throws IOException {
IOUtils.closeWhileHandlingException(httpClient);
}
}
16 changes: 15 additions & 1 deletion .../plugin/watcher/src/main/java/org/elasticsearch/xpack/watcher/common/http/HttpClient.java
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Expand Up @@ -46,6 +46,7 @@

import javax.net.ssl.HostnameVerifier;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
Expand All @@ -56,9 +57,13 @@
import java.util.List;
import java.util.Map;

public class HttpClient extends AbstractComponent {
public class HttpClient extends AbstractComponent implements Closeable {

private static final String SETTINGS_SSL_PREFIX = "xpack.http.ssl.";
// picking a reasonable high value here to allow for setups with lots of watch executions or many http inputs/actions
// this is also used as the value per route, if you are connecting to the same endpoint a lot, which is likely, when
// you are querying a remote Elasticsearch cluster
private static final int MAX_CONNECTIONS = 500;

private final HttpAuthRegistry httpAuthRegistry;
private final CloseableHttpClient client;
Expand All @@ -84,6 +89,10 @@ public HttpClient(Settings settings, HttpAuthRegistry httpAuthRegistry, SSLServi
SSLConnectionSocketFactory factory = new SSLConnectionSocketFactory(sslService.sslSocketFactory(sslSettings), verifier);
clientBuilder.setSSLSocketFactory(factory);

clientBuilder.evictExpiredConnections();
clientBuilder.setMaxConnPerRoute(MAX_CONNECTIONS);
clientBuilder.setMaxConnTotal(MAX_CONNECTIONS);

client = clientBuilder.build();
}

Expand Down Expand Up @@ -251,6 +260,11 @@ private URI createURI(HttpRequest request) {
}
}

@Override
public void close() throws IOException {
client.close();
}

/**
* Helper class to have all HTTP methods except HEAD allow for an body, including GET
*/
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6 changes: 2 additions & 4 deletions ...her/src/test/java/org/elasticsearch/xpack/watcher/actions/webhook/WebhookActionTests.java
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Expand Up @@ -44,7 +44,6 @@
import org.junit.Before;

import javax.mail.internet.AddressException;

import java.io.IOException;
import java.util.Map;

Expand Down Expand Up @@ -219,10 +218,9 @@ private WebhookActionFactory webhookFactory(HttpClient client) {

public void testThatSelectingProxyWorks() throws Exception {
Environment environment = TestEnvironment.newEnvironment(Settings.builder().put("path.home", createTempDir()).build());
HttpClient httpClient = new HttpClient(Settings.EMPTY, authRegistry,
new SSLService(environment.settings(), environment));

try (MockWebServer proxyServer = new MockWebServer()) {
try (HttpClient httpClient = new HttpClient(Settings.EMPTY, authRegistry,
new SSLService(environment.settings(), environment)); MockWebServer proxyServer = new MockWebServer()) {
proxyServer.start();
proxyServer.enqueue(new MockResponse().setResponseCode(200).setBody("fullProxiedContent"));

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105 changes: 56 additions & 49 deletions ...in/watcher/src/test/java/org/elasticsearch/xpack/watcher/common/http/HttpClientTests.java
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Expand Up @@ -77,6 +77,7 @@ public void init() throws Exception {
@After
public void shutdown() throws Exception {
webServer.close();
httpClient.close();
}

public void testBasics() throws Exception {
Expand Down Expand Up @@ -184,17 +185,18 @@ public void testHttps() throws Exception {
.setSecureSettings(secureSettings)
.build();
}
httpClient = new HttpClient(settings, authRegistry, new SSLService(settings, environment));
secureSettings = new MockSecureSettings();
// We can't use the client created above for the server since it is only a truststore
secureSettings.setString("xpack.ssl.keystore.secure_password", "testnode");
Settings settings2 = Settings.builder()
.put("xpack.ssl.keystore.path", getDataPath("/org/elasticsearch/xpack/security/keystore/testnode.jks"))
.setSecureSettings(secureSettings)
.build();
try (HttpClient client = new HttpClient(settings, authRegistry, new SSLService(settings, environment))) {
secureSettings = new MockSecureSettings();
// We can't use the client created above for the server since it is only a truststore
secureSettings.setString("xpack.ssl.keystore.secure_password", "testnode");
Settings settings2 = Settings.builder()
.put("xpack.ssl.keystore.path", getDataPath("/org/elasticsearch/xpack/security/keystore/testnode.jks"))
.setSecureSettings(secureSettings)
.build();

TestsSSLService sslService = new TestsSSLService(settings2, environment);
testSslMockWebserver(sslService.sslContext(), false);
TestsSSLService sslService = new TestsSSLService(settings2, environment);
testSslMockWebserver(client, sslService.sslContext(), false);
}
}

public void testHttpsDisableHostnameVerification() throws Exception {
Expand All @@ -217,18 +219,19 @@ public void testHttpsDisableHostnameVerification() throws Exception {
.setSecureSettings(secureSettings)
.build();
}
httpClient = new HttpClient(settings, authRegistry, new SSLService(settings, environment));
MockSecureSettings secureSettings = new MockSecureSettings();
// We can't use the client created above for the server since it only defines a truststore
secureSettings.setString("xpack.ssl.keystore.secure_password", "testnode-no-subjaltname");
Settings settings2 = Settings.builder()
.put("xpack.ssl.keystore.path",
getDataPath("/org/elasticsearch/xpack/security/transport/ssl/certs/simple/testnode-no-subjaltname.jks"))
.setSecureSettings(secureSettings)
.build();
try (HttpClient client = new HttpClient(settings, authRegistry, new SSLService(settings, environment))) {
MockSecureSettings secureSettings = new MockSecureSettings();
// We can't use the client created above for the server since it only defines a truststore
secureSettings.setString("xpack.ssl.keystore.secure_password", "testnode-no-subjaltname");
Settings settings2 = Settings.builder()
.put("xpack.ssl.keystore.path",
getDataPath("/org/elasticsearch/xpack/security/transport/ssl/certs/simple/testnode-no-subjaltname.jks"))
.setSecureSettings(secureSettings)
.build();

TestsSSLService sslService = new TestsSSLService(settings2, environment);
testSslMockWebserver(sslService.sslContext(), false);
TestsSSLService sslService = new TestsSSLService(settings2, environment);
testSslMockWebserver(client, sslService.sslContext(), false);
}
}

public void testHttpsClientAuth() throws Exception {
Expand All @@ -241,19 +244,20 @@ public void testHttpsClientAuth() throws Exception {
.build();

TestsSSLService sslService = new TestsSSLService(settings, environment);
httpClient = new HttpClient(settings, authRegistry, sslService);
testSslMockWebserver(sslService.sslContext(), true);
try (HttpClient client = new HttpClient(settings, authRegistry, sslService)) {
testSslMockWebserver(client, sslService.sslContext(), true);
}
}

private void testSslMockWebserver(SSLContext sslContext, boolean needClientAuth) throws IOException {
private void testSslMockWebserver(HttpClient client, SSLContext sslContext, boolean needClientAuth) throws IOException {
try (MockWebServer mockWebServer = new MockWebServer(sslContext, needClientAuth)) {
mockWebServer.enqueue(new MockResponse().setResponseCode(200).setBody("body"));
mockWebServer.start();

HttpRequest.Builder request = HttpRequest.builder("localhost", mockWebServer.getPort())
.scheme(Scheme.HTTPS)
.path("/test");
HttpResponse response = httpClient.execute(request.build());
HttpResponse response = client.execute(request.build());
assertThat(response.status(), equalTo(200));
assertThat(response.body().utf8ToString(), equalTo("body"));

Expand Down Expand Up @@ -288,14 +292,14 @@ public void testHttpResponseWithAnyStatusCodeCanReturnBody() throws Exception {

@Network
public void testHttpsWithoutTruststore() throws Exception {
HttpClient httpClient = new HttpClient(Settings.EMPTY, authRegistry, new SSLService(Settings.EMPTY, environment));

// Known server with a valid cert from a commercial CA
HttpRequest.Builder request = HttpRequest.builder("www.elastic.co", 443).scheme(Scheme.HTTPS);
HttpResponse response = httpClient.execute(request.build());
assertThat(response.status(), equalTo(200));
assertThat(response.hasContent(), is(true));
assertThat(response.body(), notNullValue());
try (HttpClient client = new HttpClient(Settings.EMPTY, authRegistry, new SSLService(Settings.EMPTY, environment))) {
// Known server with a valid cert from a commercial CA
HttpRequest.Builder request = HttpRequest.builder("www.elastic.co", 443).scheme(Scheme.HTTPS);
HttpResponse response = client.execute(request.build());
assertThat(response.status(), equalTo(200));
assertThat(response.hasContent(), is(true));
assertThat(response.body(), notNullValue());
}
}

public void testThatProxyCanBeConfigured() throws Exception {
Expand All @@ -307,15 +311,16 @@ public void testThatProxyCanBeConfigured() throws Exception {
.put(HttpSettings.PROXY_HOST.getKey(), "localhost")
.put(HttpSettings.PROXY_PORT.getKey(), proxyServer.getPort())
.build();
HttpClient httpClient = new HttpClient(settings, authRegistry, new SSLService(settings, environment));

HttpRequest.Builder requestBuilder = HttpRequest.builder("localhost", webServer.getPort())
.method(HttpMethod.GET)
.path("/");

HttpResponse response = httpClient.execute(requestBuilder.build());
assertThat(response.status(), equalTo(200));
assertThat(response.body().utf8ToString(), equalTo("fullProxiedContent"));
try (HttpClient client = new HttpClient(settings, authRegistry, new SSLService(settings, environment))) {
HttpResponse response = client.execute(requestBuilder.build());
assertThat(response.status(), equalTo(200));
assertThat(response.body().utf8ToString(), equalTo("fullProxiedContent"));
}

// ensure we hit the proxyServer and not the webserver
assertThat(webServer.requests(), hasSize(0));
Expand Down Expand Up @@ -386,16 +391,16 @@ public void testProxyCanHaveDifferentSchemeThanRequest() throws Exception {
.setSecureSettings(secureSettings)
.build();

HttpClient httpClient = new HttpClient(settings, authRegistry, new SSLService(settings, environment));

HttpRequest.Builder requestBuilder = HttpRequest.builder("localhost", webServer.getPort())
.method(HttpMethod.GET)
.scheme(Scheme.HTTP)
.path("/");

HttpResponse response = httpClient.execute(requestBuilder.build());
assertThat(response.status(), equalTo(200));
assertThat(response.body().utf8ToString(), equalTo("fullProxiedContent"));
try (HttpClient client = new HttpClient(settings, authRegistry, new SSLService(settings, environment))) {
HttpResponse response = client.execute(requestBuilder.build());
assertThat(response.status(), equalTo(200));
assertThat(response.body().utf8ToString(), equalTo("fullProxiedContent"));
}

// ensure we hit the proxyServer and not the webserver
assertThat(webServer.requests(), hasSize(0));
Expand All @@ -413,16 +418,17 @@ public void testThatProxyCanBeOverriddenByRequest() throws Exception {
.put(HttpSettings.PROXY_PORT.getKey(), proxyServer.getPort() + 1)
.put(HttpSettings.PROXY_HOST.getKey(), "https")
.build();
HttpClient httpClient = new HttpClient(settings, authRegistry, new SSLService(settings, environment));

HttpRequest.Builder requestBuilder = HttpRequest.builder("localhost", webServer.getPort())
.method(HttpMethod.GET)
.proxy(new HttpProxy("localhost", proxyServer.getPort(), Scheme.HTTP))
.path("/");

HttpResponse response = httpClient.execute(requestBuilder.build());
assertThat(response.status(), equalTo(200));
assertThat(response.body().utf8ToString(), equalTo("fullProxiedContent"));
try (HttpClient client = new HttpClient(settings, authRegistry, new SSLService(settings, environment))) {
HttpResponse response = client.execute(requestBuilder.build());
assertThat(response.status(), equalTo(200));
assertThat(response.body().utf8ToString(), equalTo("fullProxiedContent"));
}

// ensure we hit the proxyServer and not the webserver
assertThat(webServer.requests(), hasSize(0));
Expand Down Expand Up @@ -535,12 +541,13 @@ public void testMaxHttpResponseSize() throws Exception {
Settings settings = Settings.builder()
.put(HttpSettings.MAX_HTTP_RESPONSE_SIZE.getKey(), new ByteSizeValue(randomBytesLength - 1, ByteSizeUnit.BYTES))
.build();
HttpClient httpClient = new HttpClient(settings, authRegistry, new SSLService(environment.settings(), environment));

HttpRequest.Builder requestBuilder = HttpRequest.builder("localhost", webServer.getPort()).method(HttpMethod.GET).path("/");

IOException e = expectThrows(IOException.class, () -> httpClient.execute(requestBuilder.build()));
assertThat(e.getMessage(), startsWith("Maximum limit of"));
try (HttpClient client = new HttpClient(settings, authRegistry, new SSLService(environment.settings(), environment))) {
IOException e = expectThrows(IOException.class, () -> client.execute(requestBuilder.build()));
assertThat(e.getMessage(), startsWith("Maximum limit of"));
}
}

public void testThatGetRedirectIsFollowed() throws Exception {
Expand Down
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