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* to you under the Apache License, Version 2.0 (the
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*
* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.hadoop.hive.metastore;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.lang.reflect.UndeclaredThrowableException;
import java.util.concurrent.TimeUnit;
import org.apache.commons.lang.exception.ExceptionUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.common.classification.InterfaceAudience;
import org.apache.hadoop.hive.common.classification.InterfaceStability;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.api.MetaException;
import org.apache.hadoop.hive.metastore.api.NoSuchObjectException;
import org.datanucleus.exceptions.NucleusException;
@InterfaceAudience.Private
@InterfaceStability.Evolving
public class RetryingHMSHandler implements InvocationHandler {
private static final Log LOG = LogFactory.getLog(RetryingHMSHandler.class);
private final IHMSHandler baseHandler;
private final MetaStoreInit.MetaStoreInitData metaStoreInitData =
new MetaStoreInit.MetaStoreInitData();
private final HiveConf origConf; // base configuration
private final Configuration activeConf; // active configuration
private RetryingHMSHandler(HiveConf hiveConf, IHMSHandler baseHandler, boolean local) throws MetaException {
this.origConf = hiveConf;
this.baseHandler = baseHandler;
if (local) {
baseHandler.setConf(hiveConf); // tests expect configuration changes applied directly to metastore
}
activeConf = baseHandler.getConf();
// This has to be called before initializing the instance of HMSHandler
// Using the hook on startup ensures that the hook always has priority
// over settings in *.xml. The thread local conf needs to be used because at this point
// it has already been initialized using hiveConf.
MetaStoreInit.updateConnectionURL(hiveConf, getActiveConf(), null, metaStoreInitData);
baseHandler.init();
}
public static IHMSHandler getProxy(HiveConf hiveConf, IHMSHandler baseHandler, boolean local)
throws MetaException {
RetryingHMSHandler handler = new RetryingHMSHandler(hiveConf, baseHandler, local);
return (IHMSHandler) Proxy.newProxyInstance(
RetryingHMSHandler.class.getClassLoader(),
new Class[] { IHMSHandler.class }, handler);
}
@Override
public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {
boolean gotNewConnectUrl = false;
boolean reloadConf = HiveConf.getBoolVar(origConf,
HiveConf.ConfVars.HMSHANDLERFORCERELOADCONF);
long retryInterval = HiveConf.getTimeVar(origConf,
HiveConf.ConfVars.HMSHANDLERINTERVAL, TimeUnit.MILLISECONDS);
int retryLimit = HiveConf.getIntVar(origConf,
HiveConf.ConfVars.HMSHANDLERATTEMPTS);
long timeout = HiveConf.getTimeVar(origConf,
HiveConf.ConfVars.METASTORE_CLIENT_SOCKET_TIMEOUT, TimeUnit.MILLISECONDS);
Deadline.registerIfNot(timeout);
if (reloadConf) {
MetaStoreInit.updateConnectionURL(origConf, getActiveConf(),
null, metaStoreInitData);
}
int retryCount = 0;
Throwable caughtException = null;
while (true) {
try {
if (reloadConf || gotNewConnectUrl) {
baseHandler.setConf(getActiveConf());
}
Deadline.startTimer(method.getName());
Object object = method.invoke(baseHandler, args);
Deadline.stopTimer();
return object;
} catch (javax.jdo.JDOException e) {
caughtException = e;
} catch (UndeclaredThrowableException e) {
if (e.getCause() != null) {
if (e.getCause() instanceof javax.jdo.JDOException) {
// Due to reflection, the jdo exception is wrapped in
// invocationTargetException
caughtException = e.getCause();
} else if (e.getCause() instanceof MetaException && e.getCause().getCause() != null
&& e.getCause().getCause() instanceof javax.jdo.JDOException) {
// The JDOException may be wrapped further in a MetaException
caughtException = e.getCause().getCause();
} else {
LOG.error(ExceptionUtils.getStackTrace(e.getCause()));
throw e.getCause();
}
} else {
LOG.error(ExceptionUtils.getStackTrace(e));
throw e;
}
} catch (InvocationTargetException e) {
if (e.getCause() instanceof javax.jdo.JDOException) {
// Due to reflection, the jdo exception is wrapped in
// invocationTargetException
caughtException = e.getCause();
} else if (e.getCause() instanceof NoSuchObjectException || e.getTargetException().getCause() instanceof NoSuchObjectException) {
String methodName = method.getName();
if (!methodName.startsWith("get_database") && !methodName.startsWith("get_table")
&& !methodName.startsWith("get_partition") && !methodName.startsWith("get_function")) {
LOG.error(ExceptionUtils.getStackTrace(e.getCause()));
}
throw e.getCause();
} else if (e.getCause() instanceof MetaException && e.getCause().getCause() != null) {
if (e.getCause().getCause() instanceof javax.jdo.JDOException ||
e.getCause().getCause() instanceof NucleusException) {
// The JDOException or the Nucleus Exception may be wrapped further in a MetaException
caughtException = e.getCause().getCause();
} else if (e.getCause().getCause() instanceof DeadlineException) {
// The Deadline Exception needs no retry and be thrown immediately.
Deadline.clear();
LOG.error("Error happens in method " + method.getName() + ": " +
ExceptionUtils.getStackTrace(e.getCause()));
throw e.getCause();
} else {
LOG.error(ExceptionUtils.getStackTrace(e.getCause()));
throw e.getCause();
}
} else {
LOG.error(ExceptionUtils.getStackTrace(e.getCause()));
throw e.getCause();
}
}
if (retryCount >= retryLimit) {
LOG.error("HMSHandler Fatal error: " + ExceptionUtils.getStackTrace(caughtException));
// Since returning exceptions with a nested "cause" can be a problem in
// Thrift, we are stuffing the stack trace into the message itself.
throw new MetaException(ExceptionUtils.getStackTrace(caughtException));
}
assert (retryInterval >= 0);
retryCount++;
LOG.error(
String.format(
"Retrying HMSHandler after %d ms (attempt %d of %d)", retryInterval, retryCount, retryLimit) +
" with error: " + ExceptionUtils.getStackTrace(caughtException));
Thread.sleep(retryInterval);
// If we have a connection error, the JDO connection URL hook might
// provide us with a new URL to access the datastore.
String lastUrl = MetaStoreInit.getConnectionURL(getActiveConf());
gotNewConnectUrl = MetaStoreInit.updateConnectionURL(origConf, getActiveConf(),
lastUrl, metaStoreInitData);
}
}
public Configuration getActiveConf() {
return activeConf;
}
}