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HADOOP-9784. Add a builder for HttpServer. (Junping Du via llu) 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1516128 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Luke Lu 2013-08-21 10:12:13 +00:00
parent a6ef93307e
commit 782191f1ba
12 changed files with 223 additions and 103 deletions
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2
hadoop-common-project/hadoop-common/CHANGES.txt
View File

@ -291,6 +291,8 @@ Release 2.3.0 - UNRELEASED
IMPROVEMENTS
HADOOP-9784. Add a builder for HttpServer. (Junping Du via llu)
HADOOP 9871. Fix intermittent findbugs warnings in DefaultMetricsSystem.
(Junping Du via llu)

112
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/HttpServer.java
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@ -47,6 +47,7 @@ import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.HadoopIllegalArgumentException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.ConfServlet;
@ -119,18 +120,117 @@ public class HttpServer implements FilterContainer {
protected final Map<Context, Boolean> defaultContexts =
new HashMap<Context, Boolean>();
protected final List<String> filterNames = new ArrayList<String>();
private static final int MAX_RETRIES = 10;
static final String STATE_DESCRIPTION_ALIVE = " - alive";
static final String STATE_DESCRIPTION_NOT_LIVE = " - not live";
private final boolean listenerStartedExternally;
/**
* Class to construct instances of HTTP server with specific options.
*/
public static class Builder {
String name;
String bindAddress;
Integer port;
Boolean findPort;
Configuration conf;
Connector connector;
String[] pathSpecs;
AccessControlList adminsAcl;
boolean securityEnabled = false;
String usernameConfKey = null;
String keytabConfKey = null;
public Builder setName(String name){
this.name = name;
return this;
}
public Builder setBindAddress(String bindAddress){
this.bindAddress = bindAddress;
return this;
}
public Builder setPort(int port) {
this.port = port;
return this;
}
public Builder setFindPort(boolean findPort) {
this.findPort = findPort;
return this;
}
public Builder setConf(Configuration conf) {
this.conf = conf;
return this;
}
public Builder setConnector(Connector connector) {
this.connector = connector;
return this;
}
public Builder setPathSpec(String[] pathSpec) {
this.pathSpecs = pathSpec;
return this;
}
public Builder setACL(AccessControlList acl) {
this.adminsAcl = acl;
return this;
}
public Builder setSecurityEnabled(boolean securityEnabled) {
this.securityEnabled = securityEnabled;
return this;
}
public Builder setUsernameConfKey(String usernameConfKey) {
this.usernameConfKey = usernameConfKey;
return this;
}
public Builder setKeytabConfKey(String keytabConfKey) {
this.keytabConfKey = keytabConfKey;
return this;
}
public HttpServer build() throws IOException {
if (this.name == null) {
throw new HadoopIllegalArgumentException("name is not set");
}
if (this.bindAddress == null) {
throw new HadoopIllegalArgumentException("bindAddress is not set");
}
if (this.port == null) {
throw new HadoopIllegalArgumentException("port is not set");
}
if (this.findPort == null) {
throw new HadoopIllegalArgumentException("findPort is not set");
}
if (this.conf == null) {
conf = new Configuration();
}
HttpServer server = new HttpServer(this.name, this.bindAddress, this.port,
this.findPort, this.conf, this.adminsAcl, this.connector, this.pathSpecs);
if (this.securityEnabled) {
server.initSpnego(this.conf, this.usernameConfKey, this.keytabConfKey);
}
return server;
}
}
/** Same as this(name, bindAddress, port, findPort, null); */
@Deprecated
public HttpServer(String name, String bindAddress, int port, boolean findPort
) throws IOException {
this(name, bindAddress, port, findPort, new Configuration());
}
@Deprecated
public HttpServer(String name, String bindAddress, int port,
boolean findPort, Configuration conf, Connector connector) throws IOException {
this(name, bindAddress, port, findPort, conf, null, connector, null);
@ -150,6 +250,7 @@ public class HttpServer implements FilterContainer {
* @param pathSpecs Path specifications that this httpserver will be serving.
* These will be added to any filters.
*/
@Deprecated
public HttpServer(String name, String bindAddress, int port,
boolean findPort, Configuration conf, String[] pathSpecs) throws IOException {
this(name, bindAddress, port, findPort, conf, null, null, pathSpecs);
@ -164,11 +265,13 @@ public class HttpServer implements FilterContainer {
* increment by 1 until it finds a free port.
* @param conf Configuration
*/
@Deprecated
public HttpServer(String name, String bindAddress, int port,
boolean findPort, Configuration conf) throws IOException {
this(name, bindAddress, port, findPort, conf, null, null, null);
}
@Deprecated
public HttpServer(String name, String bindAddress, int port,
boolean findPort, Configuration conf, AccessControlList adminsAcl)
throws IOException {
@ -186,6 +289,7 @@ public class HttpServer implements FilterContainer {
* @param conf Configuration
* @param adminsAcl {@link AccessControlList} of the admins
*/
@Deprecated
public HttpServer(String name, String bindAddress, int port,
boolean findPort, Configuration conf, AccessControlList adminsAcl,
Connector connector) throws IOException {
@ -529,7 +633,7 @@ public class HttpServer implements FilterContainer {
/**
* Define a filter for a context and set up default url mappings.
*/
protected void defineFilter(Context ctx, String name,
public void defineFilter(Context ctx, String name,
String classname, Map<String,String> parameters, String[] urls) {
FilterHolder holder = new FilterHolder();
@ -570,6 +674,10 @@ public class HttpServer implements FilterContainer {
return webAppContext.getAttribute(name);
}
public WebAppContext getWebAppContext(){
return this.webAppContext;
}
/**
* Get the pathname to the webapps files.
* @param appName eg "secondary" or "datanode"

16
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/http/HttpServerFunctionalTest.java
View File

@ -116,7 +116,8 @@ public class HttpServerFunctionalTest extends Assert {
public static HttpServer createServer(String host, int port)
throws IOException {
prepareTestWebapp();
return new HttpServer(TEST, host, port, true);
return new HttpServer.Builder().setName(TEST).setBindAddress(host)
.setPort(port).setFindPort(true).build();
}
/**
@ -126,7 +127,8 @@ public class HttpServerFunctionalTest extends Assert {
* @throws IOException if it could not be created
*/
public static HttpServer createServer(String webapp) throws IOException {
return new HttpServer(webapp, "0.0.0.0", 0, true);
return new HttpServer.Builder().setName(webapp).setBindAddress("0.0.0.0")
.setPort(0).setFindPort(true).build();
}
/**
* Create an HttpServer instance for the given webapp
@ -137,13 +139,16 @@ public class HttpServerFunctionalTest extends Assert {
*/
public static HttpServer createServer(String webapp, Configuration conf)
throws IOException {
return new HttpServer(webapp, "0.0.0.0", 0, true, conf);
return new HttpServer.Builder().setName(webapp).setBindAddress("0.0.0.0")
.setPort(0).setFindPort(true).setConf(conf).build();
}
public static HttpServer createServer(String webapp, Configuration conf, AccessControlList adminsAcl)
throws IOException {
return new HttpServer(webapp, "0.0.0.0", 0, true, conf, adminsAcl);
return new HttpServer.Builder().setName(webapp).setBindAddress("0.0.0.0")
.setPort(0).setFindPort(true).setConf(conf).setACL(adminsAcl).build();
}
/**
* Create an HttpServer instance for the given webapp
* @param webapp the webapp to work with
@ -154,7 +159,8 @@ public class HttpServerFunctionalTest extends Assert {
*/
public static HttpServer createServer(String webapp, Configuration conf,
String[] pathSpecs) throws IOException {
return new HttpServer(webapp, "0.0.0.0", 0, true, conf, pathSpecs);
return new HttpServer.Builder().setName(webapp).setBindAddress("0.0.0.0")
.setPort(0).setFindPort(true).setConf(conf).setPathSpec(pathSpecs).build();
}
/**

9
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/http/TestHttpServer.java
View File

@ -121,7 +121,6 @@ public class TestHttpServer extends HttpServerFunctionalTest {
@SuppressWarnings("serial")
public static class LongHeaderServlet extends HttpServlet {
@SuppressWarnings("unchecked")
@Override
public void doGet(HttpServletRequest request,
HttpServletResponse response
@ -362,7 +361,8 @@ public class TestHttpServer extends HttpServerFunctionalTest {
MyGroupsProvider.mapping.put("userA", Arrays.asList("groupA"));
MyGroupsProvider.mapping.put("userB", Arrays.asList("groupB"));
HttpServer myServer = new HttpServer("test", "0.0.0.0", 0, true, conf);
HttpServer myServer = new HttpServer.Builder().setName("test")
.setBindAddress("0.0.0.0").setPort(0).setFindPort(true).build();
myServer.setAttribute(HttpServer.CONF_CONTEXT_ATTRIBUTE, conf);
myServer.start();
int port = myServer.getPort();
@ -403,8 +403,9 @@ public class TestHttpServer extends HttpServerFunctionalTest {
MyGroupsProvider.mapping.put("userD", Arrays.asList("groupD"));
MyGroupsProvider.mapping.put("userE", Arrays.asList("groupE"));
HttpServer myServer = new HttpServer("test", "0.0.0.0", 0, true, conf,
new AccessControlList("userA,userB groupC,groupD"));
HttpServer myServer = new HttpServer.Builder().setName("test")
.setBindAddress("0.0.0.0").setPort(0).setFindPort(true).setConf(conf)
.setACL(new AccessControlList("userA,userB groupC,groupD")).build();
myServer.setAttribute(HttpServer.CONF_CONTEXT_ATTRIBUTE, conf);
myServer.start();
int port = myServer.getPort();

5
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/log/TestLogLevel.java
View File

@ -42,7 +42,10 @@ public class TestLogLevel extends TestCase {
log.error("log.error1");
assertTrue(!Level.ERROR.equals(log.getEffectiveLevel()));
HttpServer server = new HttpServer("..", "localhost", 22222, true);
HttpServer server = new HttpServer.Builder().setName("..")
.setBindAddress("localhost").setPort(22222).setFindPort(true)
.build();
server.start();
int port = server.getPort();

21
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/server/JournalNodeHttpServer.java
View File

@ -36,8 +36,8 @@ import org.apache.hadoop.hdfs.server.common.JspHelper;
import org.apache.hadoop.http.HttpServer;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.security.authorize.AccessControlList;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.SecurityUtil;
import org.apache.hadoop.security.UserGroupInformation;
/**
* Encapsulates the HTTP server started by the Journal Service.
@ -69,16 +69,15 @@ public class JournalNodeHttpServer {
bindAddr.getHostName()));
int tmpInfoPort = bindAddr.getPort();
httpServer = new HttpServer("journal", bindAddr.getHostName(),
tmpInfoPort, tmpInfoPort == 0, conf, new AccessControlList(conf
.get(DFS_ADMIN, " "))) {
{
if (UserGroupInformation.isSecurityEnabled()) {
initSpnego(conf, DFS_JOURNALNODE_INTERNAL_SPNEGO_USER_NAME_KEY,
DFSUtil.getSpnegoKeytabKey(conf, DFS_JOURNALNODE_KEYTAB_FILE_KEY));
}
}
};
httpServer = new HttpServer.Builder().setName("journal")
.setBindAddress(bindAddr.getHostName()).setPort(tmpInfoPort)
.setFindPort(tmpInfoPort == 0).setConf(conf).setACL(
new AccessControlList(conf.get(DFS_ADMIN, " ")))
.setSecurityEnabled(UserGroupInformation.isSecurityEnabled())
.setUsernameConfKey(
DFS_JOURNALNODE_INTERNAL_SPNEGO_USER_NAME_KEY)
.setKeytabConfKey(DFSUtil.getSpnegoKeytabKey(conf,
DFS_JOURNALNODE_KEYTAB_FILE_KEY)).build();
httpServer.setAttribute(JN_ATTRIBUTE_KEY, localJournalNode);
httpServer.setAttribute(JspHelper.CURRENT_CONF, conf);
httpServer.addInternalServlet("getJournal", "/getJournal",

14
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
View File

@ -385,11 +385,15 @@ public class DataNode extends Configured
String infoHost = infoSocAddr.getHostName();
int tmpInfoPort = infoSocAddr.getPort();
this.infoServer = (secureResources == null)
? new HttpServer("datanode", infoHost, tmpInfoPort, tmpInfoPort == 0,
conf, new AccessControlList(conf.get(DFS_ADMIN, " ")))
: new HttpServer("datanode", infoHost, tmpInfoPort, tmpInfoPort == 0,
conf, new AccessControlList(conf.get(DFS_ADMIN, " ")),
secureResources.getListener());
? new HttpServer.Builder().setName("datanode")
.setBindAddress(infoHost).setPort(tmpInfoPort)
.setFindPort(tmpInfoPort == 0).setConf(conf)
.setACL(new AccessControlList(conf.get(DFS_ADMIN, " "))).build()
: new HttpServer.Builder().setName("datanode")
.setBindAddress(infoHost).setPort(tmpInfoPort)
.setFindPort(tmpInfoPort == 0).setConf(conf)
.setACL(new AccessControlList(conf.get(DFS_ADMIN, " ")))
.setConnector(secureResources.getListener()).build();
LOG.info("Opened info server at " + infoHost + ":" + tmpInfoPort);
if (conf.getBoolean(DFS_HTTPS_ENABLE_KEY, false)) {
boolean needClientAuth = conf.getBoolean(DFS_CLIENT_HTTPS_NEED_AUTH_KEY,

94
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeHttpServer.java
View File

@ -18,6 +18,7 @@
package org.apache.hadoop.hdfs.server.namenode;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_ADMIN;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.HashMap;
@ -70,65 +71,30 @@ public class NameNodeHttpServer {
public void start() throws IOException {
final String infoHost = bindAddress.getHostName();
int infoPort = bindAddress.getPort();
httpServer = new HttpServer("hdfs", infoHost, infoPort,
infoPort == 0, conf,
new AccessControlList(conf.get(DFS_ADMIN, " "))) {
{
// Add SPNEGO support to NameNode
if (UserGroupInformation.isSecurityEnabled()) {
initSpnego(conf,
DFSConfigKeys.DFS_NAMENODE_INTERNAL_SPNEGO_USER_NAME_KEY,
DFSUtil.getSpnegoKeytabKey(conf,
DFSConfigKeys.DFS_NAMENODE_KEYTAB_FILE_KEY));
}
if (WebHdfsFileSystem.isEnabled(conf, LOG)) {
httpServer = new HttpServer.Builder().setName("hdfs")
.setBindAddress(infoHost).setPort(infoPort)
.setFindPort(infoPort == 0).setConf(conf).setACL(
new AccessControlList(conf.get(DFS_ADMIN, " ")))
.setSecurityEnabled(UserGroupInformation.isSecurityEnabled())
.setUsernameConfKey(
DFSConfigKeys.DFS_NAMENODE_INTERNAL_SPNEGO_USER_NAME_KEY)
.setKeytabConfKey(DFSUtil.getSpnegoKeytabKey(conf,
DFSConfigKeys.DFS_NAMENODE_KEYTAB_FILE_KEY)).build();
if (WebHdfsFileSystem.isEnabled(conf, HttpServer.LOG)) {
//add SPNEGO authentication filter for webhdfs
final String name = "SPNEGO";
final String classname = AuthFilter.class.getName();
final String pathSpec = WebHdfsFileSystem.PATH_PREFIX + "/*";
Map<String, String> params = getAuthFilterParams(conf);
defineFilter(webAppContext, name, classname, params,
httpServer.defineFilter(httpServer.getWebAppContext(), name, classname, params,
new String[]{pathSpec});
LOG.info("Added filter '" + name + "' (class=" + classname + ")");
HttpServer.LOG.info("Added filter '" + name + "' (class=" + classname + ")");
// add webhdfs packages
addJerseyResourcePackage(
httpServer.addJerseyResourcePackage(
NamenodeWebHdfsMethods.class.getPackage().getName()
+ ";" + Param.class.getPackage().getName(), pathSpec);
}
}
private Map<String, String> getAuthFilterParams(Configuration conf)
throws IOException {
Map<String, String> params = new HashMap<String, String>();
String principalInConf = conf
.get(DFSConfigKeys.DFS_WEB_AUTHENTICATION_KERBEROS_PRINCIPAL_KEY);
if (principalInConf != null && !principalInConf.isEmpty()) {
params
.put(
DFSConfigKeys.DFS_WEB_AUTHENTICATION_KERBEROS_PRINCIPAL_KEY,
SecurityUtil.getServerPrincipal(principalInConf,
bindAddress.getHostName()));
} else if (UserGroupInformation.isSecurityEnabled()) {
LOG.error("WebHDFS and security are enabled, but configuration property '" +
DFSConfigKeys.DFS_WEB_AUTHENTICATION_KERBEROS_PRINCIPAL_KEY +
"' is not set.");
}
String httpKeytab = conf.get(DFSUtil.getSpnegoKeytabKey(conf,
DFSConfigKeys.DFS_NAMENODE_KEYTAB_FILE_KEY));
if (httpKeytab != null && !httpKeytab.isEmpty()) {
params.put(
DFSConfigKeys.DFS_WEB_AUTHENTICATION_KERBEROS_KEYTAB_KEY,
httpKeytab);
} else if (UserGroupInformation.isSecurityEnabled()) {
LOG.error("WebHDFS and security are enabled, but configuration property '" +
DFSConfigKeys.DFS_WEB_AUTHENTICATION_KERBEROS_KEYTAB_KEY +
"' is not set.");
}
return params;
}
};
boolean certSSL = conf.getBoolean(DFSConfigKeys.DFS_HTTPS_ENABLE_KEY, false);
if (certSSL) {
@ -154,6 +120,38 @@ public class NameNodeHttpServer {
httpAddress = new InetSocketAddress(bindAddress.getAddress(), httpServer.getPort());
}
private Map<String, String> getAuthFilterParams(Configuration conf)
throws IOException {
Map<String, String> params = new HashMap<String, String>();
String principalInConf = conf
.get(DFSConfigKeys.DFS_WEB_AUTHENTICATION_KERBEROS_PRINCIPAL_KEY);
if (principalInConf != null && !principalInConf.isEmpty()) {
params
.put(
DFSConfigKeys.DFS_WEB_AUTHENTICATION_KERBEROS_PRINCIPAL_KEY,
SecurityUtil.getServerPrincipal(principalInConf,
bindAddress.getHostName()));
} else if (UserGroupInformation.isSecurityEnabled()) {
HttpServer.LOG.error(
"WebHDFS and security are enabled, but configuration property '" +
DFSConfigKeys.DFS_WEB_AUTHENTICATION_KERBEROS_PRINCIPAL_KEY +
"' is not set.");
}
String httpKeytab = conf.get(DFSUtil.getSpnegoKeytabKey(conf,
DFSConfigKeys.DFS_NAMENODE_KEYTAB_FILE_KEY));
if (httpKeytab != null && !httpKeytab.isEmpty()) {
params.put(
DFSConfigKeys.DFS_WEB_AUTHENTICATION_KERBEROS_KEYTAB_KEY,
httpKeytab);
} else if (UserGroupInformation.isSecurityEnabled()) {
HttpServer.LOG.error(
"WebHDFS and security are enabled, but configuration property '" +
DFSConfigKeys.DFS_WEB_AUTHENTICATION_KERBEROS_KEYTAB_KEY +
"' is not set.");
}
return params;
}
public void stop() throws Exception {
if (httpServer != null) {

22
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/SecondaryNameNode.java
View File

@ -256,19 +256,15 @@ public class SecondaryNameNode implements Runnable {
// initialize the webserver for uploading files.
int tmpInfoPort = infoSocAddr.getPort();
infoServer = new HttpServer("secondary", infoBindAddress, tmpInfoPort,
tmpInfoPort == 0, conf,
new AccessControlList(conf.get(DFS_ADMIN, " "))) {
{
if (UserGroupInformation.isSecurityEnabled()) {
initSpnego(
conf,
DFSConfigKeys.DFS_SECONDARY_NAMENODE_INTERNAL_SPNEGO_USER_NAME_KEY,
DFSUtil.getSpnegoKeytabKey(conf,
DFSConfigKeys.DFS_SECONDARY_NAMENODE_KEYTAB_FILE_KEY));
}
}
};
infoServer = new HttpServer.Builder().setName("secondary")
.setBindAddress(infoBindAddress).setPort(tmpInfoPort)
.setFindPort(tmpInfoPort == 0).setConf(conf).setACL(
new AccessControlList(conf.get(DFS_ADMIN, " ")))
.setSecurityEnabled(UserGroupInformation.isSecurityEnabled())
.setUsernameConfKey(
DFSConfigKeys.DFS_SECONDARY_NAMENODE_INTERNAL_SPNEGO_USER_NAME_KEY)
.setKeytabConfKey(DFSUtil.getSpnegoKeytabKey(conf,
DFSConfigKeys.DFS_SECONDARY_NAMENODE_KEYTAB_FILE_KEY)).build();
infoServer.setAttribute("secondary.name.node", this);
infoServer.setAttribute("name.system.image", checkpointImage);
infoServer.setAttribute(JspHelper.CURRENT_CONF, conf);

3
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestEditLogFileInputStream.java
View File

@ -42,7 +42,8 @@ public class TestEditLogFileInputStream {
@Test
public void testReadURL() throws Exception {
// Start a simple web server which hosts the log data.
HttpServer server = new HttpServer("test", "0.0.0.0", 0, true);
HttpServer server = new HttpServer.Builder().setName("test")
.setBindAddress("0.0.0.0").setPort(0).setFindPort(true).build();
server.start();
try {
server.addServlet("fakeLog", "/fakeLog", FakeLogServlet.class);

3
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapred/TestJobEndNotifier.java
View File

@ -102,7 +102,8 @@ public class TestJobEndNotifier extends TestCase {
public void setUp() throws Exception {
new File(System.getProperty("build.webapps", "build/webapps") + "/test"
).mkdirs();
server = new HttpServer("test", "0.0.0.0", 0, true);
server = new HttpServer.Builder().setName("test")
.setBindAddress("0.0.0.0").setPort(0).setFindPort(true).build();
server.addServlet("delay", "/delay", DelayServlet.class);
server.addServlet("jobend", "/jobend", JobEndServlet.class);
server.addServlet("fail", "/fail", FailServlet.class);

5
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-web-proxy/src/main/java/org/apache/hadoop/yarn/server/webproxy/WebAppProxy.java
View File

@ -87,8 +87,9 @@ public class WebAppProxy extends AbstractService {
@Override
protected void serviceStart() throws Exception {
try {
proxyServer = new HttpServer("proxy", bindAddress, port,
port == 0, getConfig(), acl);
proxyServer = new HttpServer.Builder().setName("proxy")
.setBindAddress(bindAddress).setPort(port).setFindPort(port == 0)
.setConf(getConfig()).setACL(acl).build();
proxyServer.addServlet(ProxyUriUtils.PROXY_SERVLET_NAME,
ProxyUriUtils.PROXY_PATH_SPEC, WebAppProxyServlet.class);
proxyServer.setAttribute(FETCHER_ATTRIBUTE, fetcher);