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org.apache.hadoop.hive.ql.hooks.HiveProtoLoggingHook Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hive.ql.hooks;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERDATABASE;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERDATABASE_OWNER;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERPARTITION_BUCKETNUM;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERPARTITION_FILEFORMAT;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERPARTITION_LOCATION;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERPARTITION_MERGEFILES;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERPARTITION_SERDEPROPERTIES;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERPARTITION_SERIALIZER;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_ADDCOLS;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_ADDCONSTRAINT;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_ADDPARTS;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_ARCHIVE;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_BUCKETNUM;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_CLUSTER_SORT;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_COMPACT;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_DROPCONSTRAINT;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_DROPPARTS;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_EXCHANGEPARTITION;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_FILEFORMAT;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_LOCATION;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_MERGEFILES;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_PARTCOLTYPE;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_PROPERTIES;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_RENAME;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_RENAMECOL;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_RENAMEPART;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_REPLACECOLS;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_SERDEPROPERTIES;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_SERIALIZER;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_SKEWED;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_TOUCH;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_UNARCHIVE;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_UPDATEPARTSTATS;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTABLE_UPDATETABLESTATS;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERTBLPART_SKEWED_LOCATION;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERVIEW_AS;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERVIEW_PROPERTIES;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ALTERVIEW_RENAME;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.ANALYZE_TABLE;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.CACHE_METADATA;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.CREATEDATABASE;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.CREATEFUNCTION;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.CREATEMACRO;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.CREATEROLE;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.CREATETABLE;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.CREATETABLE_AS_SELECT;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.CREATEVIEW;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.DROPDATABASE;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.DROPFUNCTION;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.DROPMACRO;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.DROPROLE;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.DROPTABLE;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.DROPVIEW;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.DROPVIEW_PROPERTIES;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.EXPORT;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.IMPORT;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.KILL_QUERY;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.LOAD;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.LOCKTABLE;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.MSCK;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.QUERY;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.RELOADFUNCTION;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.TRUNCATETABLE;
import static org.apache.hadoop.hive.ql.plan.HiveOperation.UNLOCKTABLE;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.llap.registry.impl.LlapRegistryService;
import org.apache.hadoop.hive.ql.QueryPlan;
import org.apache.hadoop.hive.ql.exec.ExplainTask;
import org.apache.hadoop.hive.ql.exec.TaskFactory;
import org.apache.hadoop.hive.ql.exec.Utilities;
import org.apache.hadoop.hive.ql.exec.mr.ExecDriver;
import org.apache.hadoop.hive.ql.exec.tez.TezTask;
import org.apache.hadoop.hive.ql.hooks.proto.HiveHookEvents.HiveHookEventProto;
import org.apache.hadoop.hive.ql.hooks.proto.HiveHookEvents.MapFieldEntry;
import org.apache.hadoop.hive.ql.parse.ExplainConfiguration;
import org.apache.hadoop.hive.ql.plan.ExplainWork;
import org.apache.hadoop.hive.ql.plan.HiveOperation;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.util.Clock;
import org.apache.hadoop.yarn.util.SystemClock;
import org.apache.hive.common.util.ShutdownHookManager;
import org.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
/**
* Log events from hive hook using protobuf serialized format, partitioned by date.
*/
public class HiveProtoLoggingHook implements ExecuteWithHookContext {
private static final Logger LOG = LoggerFactory.getLogger(HiveProtoLoggingHook.class.getName());
private static final Set includedOperationSet;
private static final int VERSION = 1;
static {
// List of operation for which we log.
includedOperationSet = Arrays.stream(new HiveOperation[] { LOAD, EXPORT, IMPORT,
CREATEDATABASE, DROPDATABASE, DROPTABLE, MSCK, ALTERTABLE_ADDCOLS, ALTERTABLE_REPLACECOLS,
ALTERTABLE_RENAMECOL, ALTERTABLE_RENAMEPART, ALTERTABLE_UPDATEPARTSTATS,
ALTERTABLE_UPDATETABLESTATS, ALTERTABLE_RENAME, ALTERTABLE_DROPPARTS, ALTERTABLE_ADDPARTS,
ALTERTABLE_TOUCH, ALTERTABLE_ARCHIVE, ALTERTABLE_UNARCHIVE, ALTERTABLE_PROPERTIES,
ALTERTABLE_SERIALIZER, ALTERPARTITION_SERIALIZER, ALTERTABLE_SERDEPROPERTIES,
ALTERPARTITION_SERDEPROPERTIES, ALTERTABLE_CLUSTER_SORT, ANALYZE_TABLE, CACHE_METADATA,
ALTERTABLE_BUCKETNUM, ALTERPARTITION_BUCKETNUM, CREATEFUNCTION, DROPFUNCTION,
RELOADFUNCTION, CREATEMACRO, DROPMACRO, CREATEVIEW, DROPVIEW, ALTERVIEW_PROPERTIES,
DROPVIEW_PROPERTIES, LOCKTABLE, UNLOCKTABLE, CREATEROLE, DROPROLE, ALTERTABLE_FILEFORMAT,
ALTERPARTITION_FILEFORMAT, ALTERTABLE_LOCATION, ALTERPARTITION_LOCATION, CREATETABLE,
TRUNCATETABLE, CREATETABLE_AS_SELECT, QUERY, ALTERDATABASE, ALTERDATABASE_OWNER,
ALTERTABLE_MERGEFILES, ALTERPARTITION_MERGEFILES, ALTERTABLE_SKEWED,
ALTERTBLPART_SKEWED_LOCATION, ALTERTABLE_PARTCOLTYPE, ALTERTABLE_EXCHANGEPARTITION,
ALTERTABLE_DROPCONSTRAINT, ALTERTABLE_ADDCONSTRAINT, ALTERVIEW_RENAME, ALTERVIEW_AS,
ALTERTABLE_COMPACT, KILL_QUERY })
.map(HiveOperation::getOperationName)
.collect(Collectors.toSet());
}
public static final String HIVE_EVENTS_BASE_PATH = "hive.hook.proto.base-directory";
public static final String HIVE_HOOK_PROTO_QUEUE_CAPACITY = "hive.hook.proto.queue.capacity";
public static final int HIVE_HOOK_PROTO_QUEUE_CAPACITY_DEFAULT = 64;
private static final int WAIT_TIME = 5;
public enum EventType {
QUERY_SUBMITTED, QUERY_COMPLETED
}
public enum OtherInfoType {
QUERY, STATUS, TEZ, MAPRED, INVOKER_INFO, SESSION_ID, THREAD_NAME, VERSION, CLIENT_IP_ADDRESS,
HIVE_ADDRESS, HIVE_INSTANCE_TYPE, CONF, PERF, LLAP_APP_ID
}
public enum ExecutionMode {
MR, TEZ, LLAP, SPARK, NONE
}
static class EventLogger {
private final Clock clock;
private final String logFileName;
private final DatePartitionedLogger logger;
private final ExecutorService eventHandler;
private final ExecutorService logWriter;
EventLogger(HiveConf conf, Clock clock) {
this.clock = clock;
// randomUUID is slow, since its cryptographically secure, only first query will take time.
this.logFileName = "hive_" + UUID.randomUUID().toString();
String baseDir = conf.get(HIVE_EVENTS_BASE_PATH);
if (baseDir == null) {
LOG.error(HIVE_EVENTS_BASE_PATH + " is not set, logging disabled.");
}
DatePartitionedLogger tmpLogger = null;
try {
if (baseDir != null) {
tmpLogger = new DatePartitionedLogger<>(HiveHookEventProto.PARSER, new Path(baseDir),
conf, clock);
}
} catch (IOException e) {
LOG.error("Unable to intialize logger, logging disabled.", e);
}
this.logger = tmpLogger;
if (logger == null) {
eventHandler = null;
logWriter = null;
return;
}
int queueCapacity = conf.getInt(HIVE_HOOK_PROTO_QUEUE_CAPACITY,
HIVE_HOOK_PROTO_QUEUE_CAPACITY_DEFAULT);
ThreadFactory threadFactory = new ThreadFactoryBuilder().setDaemon(true)
.setNameFormat("Hive Hook Proto Event Handler %d").build();
eventHandler = new ThreadPoolExecutor(1, 1, 0, TimeUnit.MILLISECONDS,
new LinkedBlockingQueue(queueCapacity), threadFactory);
threadFactory = new ThreadFactoryBuilder().setDaemon(true)
.setNameFormat("Hive Hook Proto Log Writer %d").build();
logWriter = new ThreadPoolExecutor(1, 1, 0, TimeUnit.MILLISECONDS,
new LinkedBlockingQueue(queueCapacity), threadFactory);
}
void shutdown() {
// Wait for all the events to be written off, the order of service is important
for (ExecutorService service : new ExecutorService[] {eventHandler, logWriter}) {
if (service == null) {
continue;
}
service.shutdown();
try {
service.awaitTermination(WAIT_TIME, TimeUnit.SECONDS);
} catch (InterruptedException e) {
LOG.warn("Got interrupted exception while waiting for events to be flushed", e);
}
}
}
void handle(HookContext hookContext) {
if (logger == null) {
return;
}
try {
eventHandler.execute(() -> generateEvent(hookContext));
} catch (RejectedExecutionException e) {
LOG.warn("Handler queue full ignoring event: " + hookContext.getHookType());
}
}
private void generateEvent(HookContext hookContext) {
QueryPlan plan = hookContext.getQueryPlan();
if (plan == null) {
LOG.debug("Received null query plan.");
return;
}
if (!includedOperationSet.contains(plan.getOperationName())) {
LOG.debug("Not logging events of operation type : {}", plan.getOperationName());
return;
}
HiveHookEventProto event;
switch (hookContext.getHookType()) {
case PRE_EXEC_HOOK:
event = getPreHookEvent(hookContext);
break;
case POST_EXEC_HOOK:
event = getPostHookEvent(hookContext, true);
break;
case ON_FAILURE_HOOK:
event = getPostHookEvent(hookContext, false);
break;
default:
LOG.warn("Ignoring event of type: {}", hookContext.getHookType());
event = null;
}
if (event != null) {
try {
logWriter.execute(() -> writeEvent(event));
} catch (RejectedExecutionException e) {
LOG.warn("Writer queue full ignoring event {} for query {}",
hookContext.getHookType(), plan.getQueryId());
}
}
}
private void writeEvent(HiveHookEventProto event) {
try (ProtoMessageWriter writer = logger.getWriter(logFileName)) {
writer.writeProto(event);
// This does not work hence, opening and closing file for every event.
// writer.hflush();
} catch (IOException e) {
LOG.error("Error writing proto message for query {}, eventType: {}: ",
event.getHiveQueryId(), event.getEventType(), e);
}
}
private HiveHookEventProto getPreHookEvent(HookContext hookContext) {
QueryPlan plan = hookContext.getQueryPlan();
LOG.info("Received pre-hook notification for: " + plan.getQueryId());
// Make a copy so that we do not modify hookContext conf.
HiveConf conf = new HiveConf(hookContext.getConf());
List mrTasks = Utilities.getMRTasks(plan.getRootTasks());
List tezTasks = Utilities.getTezTasks(plan.getRootTasks());
ExecutionMode executionMode = getExecutionMode(plan, mrTasks, tezTasks);
HiveHookEventProto.Builder builder = HiveHookEventProto.newBuilder();
builder.setEventType(EventType.QUERY_SUBMITTED.name());
builder.setTimestamp(plan.getQueryStartTime());
builder.setHiveQueryId(plan.getQueryId());
builder.setUser(getUser(hookContext));
builder.setRequestUser(getRequestUser(hookContext));
builder.setQueue(conf.get("mapreduce.job.queuename"));
builder.setExecutionMode(executionMode.name());
builder.addAllTablesRead(getTablesFromEntitySet(hookContext.getInputs()));
builder.addAllTablesWritten(getTablesFromEntitySet(hookContext.getOutputs()));
if (hookContext.getOperationId() != null) {
builder.setOperationId(hookContext.getOperationId());
}
try {
JSONObject queryObj = new JSONObject();
queryObj.put("queryText", plan.getQueryStr());
queryObj.put("queryPlan", getExplainPlan(plan, conf, hookContext));
addMapEntry(builder, OtherInfoType.QUERY, queryObj.toString());
} catch (Exception e) {
LOG.error("Unexpected exception while serializing json.", e);
}
addMapEntry(builder, OtherInfoType.TEZ, Boolean.toString(tezTasks.size() > 0));
addMapEntry(builder, OtherInfoType.MAPRED, Boolean.toString(mrTasks.size() > 0));
addMapEntry(builder, OtherInfoType.SESSION_ID, hookContext.getSessionId());
String logID = conf.getLogIdVar(hookContext.getSessionId());
addMapEntry(builder, OtherInfoType.INVOKER_INFO, logID);
addMapEntry(builder, OtherInfoType.THREAD_NAME, hookContext.getThreadId());
addMapEntry(builder, OtherInfoType.VERSION, Integer.toString(VERSION));
addMapEntry(builder, OtherInfoType.CLIENT_IP_ADDRESS, hookContext.getIpAddress());
String hiveInstanceAddress = hookContext.getHiveInstanceAddress();
if (hiveInstanceAddress == null) {
try {
hiveInstanceAddress = InetAddress.getLocalHost().getHostAddress();
} catch (UnknownHostException e) {
LOG.error("Error tyring to get localhost address: ", e);
}
}
addMapEntry(builder, OtherInfoType.HIVE_ADDRESS, hiveInstanceAddress);
String hiveInstanceType = hookContext.isHiveServerQuery() ? "HS2" : "CLI";
addMapEntry(builder, OtherInfoType.HIVE_INSTANCE_TYPE, hiveInstanceType);
ApplicationId llapId = determineLlapId(conf, executionMode);
if (llapId != null) {
addMapEntry(builder, OtherInfoType.LLAP_APP_ID, llapId.toString());
}
conf.stripHiddenConfigurations(conf);
JSONObject confObj = new JSONObject();
for (Map.Entry setting : conf) {
confObj.put(setting.getKey(), setting.getValue());
}
addMapEntry(builder, OtherInfoType.CONF, confObj.toString());
return builder.build();
}
private HiveHookEventProto getPostHookEvent(HookContext hookContext, boolean success) {
QueryPlan plan = hookContext.getQueryPlan();
LOG.info("Received post-hook notification for: " + plan.getQueryId());
HiveHookEventProto.Builder builder = HiveHookEventProto.newBuilder();
builder.setEventType(EventType.QUERY_COMPLETED.name());
builder.setTimestamp(clock.getTime());
builder.setHiveQueryId(plan.getQueryId());
builder.setUser(getUser(hookContext));
builder.setRequestUser(getRequestUser(hookContext));
if (hookContext.getOperationId() != null) {
builder.setOperationId(hookContext.getOperationId());
}
addMapEntry(builder, OtherInfoType.STATUS, Boolean.toString(success));
JSONObject perfObj = new JSONObject(hookContext.getPerfLogger().getEndTimes());
addMapEntry(builder, OtherInfoType.PERF, perfObj.toString());
return builder.build();
}
private void addMapEntry(HiveHookEventProto.Builder builder, OtherInfoType key, String value) {
if (value != null) {
builder.addOtherInfo(
MapFieldEntry.newBuilder().setKey(key.name()).setValue(value).build());
}
}
private String getUser(HookContext hookContext) {
return hookContext.getUgi().getShortUserName();
}
private String getRequestUser(HookContext hookContext) {
String requestuser = hookContext.getUserName();
if (requestuser == null) {
requestuser = hookContext.getUgi().getUserName();
}
return requestuser;
}
private List getTablesFromEntitySet(Set entities) {
List tableNames = new ArrayList<>();
for (Entity entity : entities) {
if (entity.getType() == Entity.Type.TABLE) {
tableNames.add(entity.getTable().getDbName() + "." + entity.getTable().getTableName());
}
}
return tableNames;
}
private ExecutionMode getExecutionMode(QueryPlan plan, List mrTasks,
List tezTasks) {
if (tezTasks.size() > 0) {
// Need to go in and check if any of the tasks is running in LLAP mode.
for (TezTask tezTask : tezTasks) {
if (tezTask.getWork().getLlapMode()) {
return ExecutionMode.LLAP;
}
}
return ExecutionMode.TEZ;
} else if (mrTasks.size() > 0) {
return ExecutionMode.MR;
} else if (Utilities.getSparkTasks(plan.getRootTasks()).size() > 0) {
return ExecutionMode.SPARK;
} else {
return ExecutionMode.NONE;
}
}
private JSONObject getExplainPlan(QueryPlan plan, HiveConf conf, HookContext hookContext)
throws Exception {
// Get explain plan for the query.
ExplainConfiguration config = new ExplainConfiguration();
config.setFormatted(true);
ExplainWork work = new ExplainWork(null, // resFile
null, // pCtx
plan.getRootTasks(), // RootTasks
plan.getFetchTask(), // FetchTask
null, // analyzer
config, // explainConfig
null // cboInfo
);
ExplainTask explain = (ExplainTask) TaskFactory.get(work, conf);
explain.initialize(hookContext.getQueryState(), plan, null, null);
return explain.getJSONPlan(null, work);
}
private ApplicationId determineLlapId(HiveConf conf, ExecutionMode mode) {
// Note: for now, LLAP is only supported in Tez tasks. Will never come to MR; others may
// be added here, although this is only necessary to have extra debug information.
if (mode == ExecutionMode.LLAP) {
// In HS2, the client should have been cached already for the common case.
// Otherwise, this may actually introduce delay to compilation for the first query.
String hosts = HiveConf.getVar(conf, HiveConf.ConfVars.LLAP_DAEMON_SERVICE_HOSTS);
if (hosts != null && !hosts.isEmpty()) {
try {
return LlapRegistryService.getClient(conf).getApplicationId();
} catch (IOException e) {
LOG.error("Error trying to get llap instance", e);
}
} else {
LOG.info("Cannot determine LLAP instance on client - service hosts are not set");
return null;
}
}
return null;
}
// Singleton using DCL.
private static volatile EventLogger instance;
static EventLogger getInstance(HiveConf conf) {
if (instance == null) {
synchronized (EventLogger.class) {
if (instance == null) {
instance = new EventLogger(conf, SystemClock.getInstance());
ShutdownHookManager.addShutdownHook(instance::shutdown);
}
}
}
return instance;
}
}
@Override
public void run(HookContext hookContext) throws Exception {
try {
EventLogger logger = EventLogger.getInstance(hookContext.getConf());
logger.handle(hookContext);
} catch (Exception e) {
LOG.error("Got exceptoin while processing event: ", e);
}
}
}
