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From par...@apache.org
Subject [3/5] drill git commit: DRILL-1197: C++ Client. Differentiate socket/handshake/query timeout for deadline timer.
Date Sat, 14 Feb 2015 05:51:41 GMT
DRILL-1197: C++ Client. Differentiate socket/handshake/query timeout for deadline timer.

It also

- returns more detailed connection status for validate handshake.
- adds timeout options for query submitter.


Project: http://git-wip-us.apache.org/repos/asf/drill/repo
Commit: http://git-wip-us.apache.org/repos/asf/drill/commit/0553798c
Tree: http://git-wip-us.apache.org/repos/asf/drill/tree/0553798c
Diff: http://git-wip-us.apache.org/repos/asf/drill/diff/0553798c

Branch: refs/heads/master
Commit: 0553798c18aae6b3dfc14227e0cef5f2baea11fe
Parents: 3076978
Author: Xiao Meng <xiaom.cs@gmail.com>
Authored: Tue Feb 10 17:59:23 2015 -0800
Committer: Parth Chandra <pchandra@maprtech.com>
Committed: Fri Feb 13 21:50:48 2015 -0800

----------------------------------------------------------------------
 .../native/client/example/querySubmitter.cpp    | 15 +++-
 .../native/client/src/clientlib/drillClient.cpp | 31 +++++++-
 .../client/src/clientlib/drillClientImpl.cpp    | 84 +++++++++++---------
 .../client/src/clientlib/drillClientImpl.hpp    |  6 +-
 contrib/native/client/src/clientlib/errmsgs.cpp |  1 +
 contrib/native/client/src/clientlib/errmsgs.hpp |  3 +-
 .../native/client/src/include/drill/common.hpp  |  6 +-
 .../client/src/include/drill/drillClient.hpp    | 24 +++++-
 8 files changed, 123 insertions(+), 47 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/drill/blob/0553798c/contrib/native/client/example/querySubmitter.cpp
----------------------------------------------------------------------
diff --git a/contrib/native/client/example/querySubmitter.cpp b/contrib/native/client/example/querySubmitter.cpp
index 2d89223..9ecee24 100644
--- a/contrib/native/client/example/querySubmitter.cpp
+++ b/contrib/native/client/example/querySubmitter.cpp
@@ -22,7 +22,7 @@
 #include <stdlib.h>
 #include "drill/drillc.hpp"
 
-int nOptions=8;
+int nOptions=10;
 
 struct Option{
     char name[32];
@@ -36,7 +36,9 @@ struct Option{
     {"schema", "Default schema", false},
     {"api", "API type [sync|async]", true},
     {"logLevel", "Logging level [trace|debug|info|warn|error|fatal]", false},
-    {"testCancel", "Cancel the query afterthe first record batch.", false}
+    {"testCancel", "Cancel the query afterthe first record batch.", false},
+    {"hshakeTimeout", "Handshake timeout (second).", false},
+    {"queryTimeout", "Query timeout (second).", false}
 };
 
 std::map<std::string, std::string> qsOptionValues;
@@ -266,6 +268,8 @@ int main(int argc, char* argv[]) {
         std::string type_str=qsOptionValues["type"];
         std::string logLevel=qsOptionValues["logLevel"];
         std::string testCancel=qsOptionValues["testCancel"];
+        std::string hshakeTimeout=qsOptionValues["hshakeTimeout"];
+        std::string queryTimeout=qsOptionValues["queryTimeout"];
 
         Drill::QueryType type;
 
@@ -309,6 +313,13 @@ int main(int argc, char* argv[]) {
         int nQueries=queryInputs.size();
         Drill::DrillClientConfig::setBufferLimit(nQueries*2*1024*1024); // 2MB per query.
Allows us to hold at least two record batches.
 
+
+        if (!hshakeTimeout.empty()){
+            Drill::DrillClientConfig::setHandshakeTimeout(atoi(hshakeTimeout.c_str()));
+        }
+        if (!queryTimeout.empty()){
+            Drill::DrillClientConfig::setQueryTimeout(atoi(queryTimeout.c_str()));
+        }
         if(client.connect(connectStr.c_str(), schema.c_str())!=Drill::CONN_SUCCESS){
             std::cerr<< "Failed to connect with error: "<< client.getError()
<< " (Using:"<<connectStr<<")"<<std::endl;
             return -1;

http://git-wip-us.apache.org/repos/asf/drill/blob/0553798c/contrib/native/client/src/clientlib/drillClient.cpp
----------------------------------------------------------------------
diff --git a/contrib/native/client/src/clientlib/drillClient.cpp b/contrib/native/client/src/clientlib/drillClient.cpp
index 02bc1a4..878dad4 100644
--- a/contrib/native/client/src/clientlib/drillClient.cpp
+++ b/contrib/native/client/src/clientlib/drillClient.cpp
@@ -43,9 +43,12 @@ DrillClientInitializer::~DrillClientInitializer(){
     google::protobuf::ShutdownProtobufLibrary();
 }
 
+// Initialize static member of DrillClientConfig
 logLevel_t DrillClientConfig::s_logLevel=LOG_ERROR;
 uint64_t DrillClientConfig::s_bufferLimit=MAX_MEM_ALLOC_SIZE;
-int32_t DrillClientConfig::s_socketTimeout=180;
+int32_t DrillClientConfig::s_socketTimeout=0;
+int32_t DrillClientConfig::s_handshakeTimeout=5;
+int32_t DrillClientConfig::s_queryTimeout=180;
 boost::mutex DrillClientConfig::s_mutex;
 
 DrillClientConfig::DrillClientConfig(){
@@ -82,11 +85,35 @@ void DrillClientConfig::setSocketTimeout(int32_t t){
     s_socketTimeout=t;
 }
 
+void DrillClientConfig::setHandshakeTimeout(int32_t t){
+    if (t > 0) {
+        boost::lock_guard<boost::mutex> configLock(DrillClientConfig::s_mutex);
+        s_handshakeTimeout = t;
+    }
+}
+
+void DrillClientConfig::setQueryTimeout(int32_t t){
+    if (t>0){
+        boost::lock_guard<boost::mutex> configLock(DrillClientConfig::s_mutex);
+        s_queryTimeout=t;
+    }
+}
+
 int32_t DrillClientConfig::getSocketTimeout(){
     boost::lock_guard<boost::mutex> configLock(DrillClientConfig::s_mutex);
     return s_socketTimeout;
 }
 
+int32_t DrillClientConfig::getHandshakeTimeout(){
+    boost::lock_guard<boost::mutex> configLock(DrillClientConfig::s_mutex);
+    return  s_handshakeTimeout;
+}
+
+int32_t DrillClientConfig::getQueryTimeout(){
+    boost::lock_guard<boost::mutex> configLock(DrillClientConfig::s_mutex);
+    return s_queryTimeout;
+}
+
 logLevel_t DrillClientConfig::getLogLevel(){
     boost::lock_guard<boost::mutex> configLock(DrillClientConfig::s_mutex);
     return s_logLevel;
@@ -263,7 +290,7 @@ connectionStatus_t DrillClient::connect(const char* connectStr, const
char* defa
     ret=this->m_pImpl->connect(connectStr);
 
     if(ret==CONN_SUCCESS)
-        ret=this->m_pImpl->validateHandShake(defaultSchema)?CONN_SUCCESS:CONN_HANDSHAKE_FAILED;
+        ret=this->m_pImpl->validateHandShake(defaultSchema);
     return ret;
 
 }

http://git-wip-us.apache.org/repos/asf/drill/blob/0553798c/contrib/native/client/src/clientlib/drillClientImpl.cpp
----------------------------------------------------------------------
diff --git a/contrib/native/client/src/clientlib/drillClientImpl.cpp b/contrib/native/client/src/clientlib/drillClientImpl.cpp
index c832a79..c0382ba 100644
--- a/contrib/native/client/src/clientlib/drillClientImpl.cpp
+++ b/contrib/native/client/src/clientlib/drillClientImpl.cpp
@@ -169,13 +169,17 @@ connectionStatus_t DrillClientImpl::recvHandshake(){
         m_rbuf = Utils::allocateBuffer(MAX_SOCK_RD_BUFSIZE);
     }
 
-    m_deadlineTimer.expires_from_now(boost::posix_time::seconds(DrillClientConfig::getSocketTimeout()));
-    m_deadlineTimer.async_wait(boost::bind(
-                &DrillClientImpl::handleHShakeReadTimeout,
-                this,
-                boost::asio::placeholders::error
-                ));
-    DRILL_LOG(LOG_TRACE) << "Started new handshake wait timer."  << std::endl;
+    m_io_service.reset();
+    if (DrillClientConfig::getHandshakeTimeout() > 0){
+        m_deadlineTimer.expires_from_now(boost::posix_time::seconds(DrillClientConfig::getHandshakeTimeout()));
+        m_deadlineTimer.async_wait(boost::bind(
+                    &DrillClientImpl::handleHShakeReadTimeout,
+                    this,
+                    boost::asio::placeholders::error
+                    ));
+        DRILL_LOG(LOG_TRACE) << "Started new handshake wait timer with "
+                << DrillClientConfig::getHandshakeTimeout() << " seconds." <<
std::endl;
+    }
 
     async_read(
             this->m_socket,
@@ -201,7 +205,7 @@ void DrillClientImpl::handleHandshake(ByteBuf_t _buf,
     boost::system::error_code error=err;
     // cancel the timer
     m_deadlineTimer.cancel();
-    DRILL_LOG(LOG_TRACE) << "Deadline timer cancelled."  << std::endl;
+    DRILL_LOG(LOG_TRACE) << "Deadline timer cancelled." << std::endl;
     if(!error){
         InBoundRpcMessage msg;
         uint32_t length = 0;
@@ -222,7 +226,9 @@ void DrillClientImpl::handleHandshake(ByteBuf_t _buf,
             }
             DrillClientImpl::s_decoder.Decode(m_rbuf+bytes_read, length, msg);
         }else{
+            DRILL_LOG(LOG_TRACE) << "DrillClientImpl::handleHandshake: ERR_CONN_RDFAIL.
No handshake.\n";
             handleConnError(CONN_FAILURE, getMessage(ERR_CONN_RDFAIL, "No handshake"));
+            return;
         }
         exec::user::BitToUserHandshake b2u;
         b2u.ParseFromArray(msg.m_pbody.data(), msg.m_pbody.size());
@@ -243,21 +249,22 @@ void DrillClientImpl::handleHandshake(ByteBuf_t _buf,
 
 void DrillClientImpl::handleHShakeReadTimeout(const boost::system::error_code & err){
     // if err == boost::asio::error::operation_aborted) then the caller cancelled the timer.
-    if(!err){
+    if(err != boost::asio::error::operation_aborted){
         // Check whether the deadline has passed.
         if (m_deadlineTimer.expires_at() <= boost::asio::deadline_timer::traits_type::now()){
             // The deadline has passed.
             m_deadlineTimer.expires_at(boost::posix_time::pos_infin);
-            DRILL_LOG(LOG_TRACE) << "Deadline timer expired."  << std::endl;
+            DRILL_LOG(LOG_TRACE) << "DrillClientImpl::HandleHShakeReadTimeout: Deadline
timer expired; ERR_CONN_HSHAKETIMOUT.\n";
+            handleConnError(CONN_HANDSHAKE_TIMEOUT, getMessage(ERR_CONN_HSHAKETIMOUT));
+            m_io_service.stop();
             boost::system::error_code ignorederr;
-            m_socket.shutdown(boost::asio::ip::tcp::socket::shutdown_send, ignorederr);
-            m_socket.close();
+            m_socket.shutdown(boost::asio::ip::tcp::socket::shutdown_both, ignorederr);
         }
     }
     return;
 }
 
-bool DrillClientImpl::validateHandShake(const char* defaultSchema){
+connectionStatus_t DrillClientImpl::validateHandShake(const char* defaultSchema){
 
     DRILL_LOG(LOG_TRACE) << "validateHandShake\n";
 
@@ -282,19 +289,19 @@ bool DrillClientImpl::validateHandShake(const char* defaultSchema){
         DRILL_LOG(LOG_TRACE) << "Sent handshake request message. Coordination id: "
<< coordId << "\n";
     }
 
-    recvHandshake();
-    this->m_io_service.reset();
-    if(this->m_pError!=NULL){
-        return false;
+    connectionStatus_t ret = recvHandshake();
+    if(ret!=CONN_SUCCESS){
+        return ret;
     }
     if(m_handshakeVersion != u2b.rpc_version()) {
         DRILL_LOG(LOG_TRACE) << "Invalid rpc version.  Expected << "
             << DRILL_RPC_VERSION << ", actual "<< m_handshakeVersion <<
"." << std::endl;
-        handleConnError(CONN_HANDSHAKE_FAILED,
+        return handleConnError(CONN_HANDSHAKE_FAILED,
                 getMessage(ERR_CONN_NOHSHAKE, DRILL_RPC_VERSION, m_handshakeVersion));
-        return false;
     }
-    return true;
+    // reset io_service after handshake is validated before running queries
+    m_io_service.reset();
+    return CONN_SUCCESS;
 }
 
 
@@ -365,14 +372,16 @@ void DrillClientImpl::getNextResult(){
     }
     //use free, not delete to free
     ByteBuf_t readBuf = Utils::allocateBuffer(LEN_PREFIX_BUFLEN);
-
-    m_deadlineTimer.expires_from_now(boost::posix_time::seconds(DrillClientConfig::getSocketTimeout()));
-    m_deadlineTimer.async_wait(boost::bind(
-                &DrillClientImpl::handleReadTimeout,
-                this,
-                boost::asio::placeholders::error
-                ));
-    DRILL_LOG(LOG_TRACE) << "Started new async wait timer."  << std::endl;
+    if (DrillClientConfig::getQueryTimeout() > 0){
+        DRILL_LOG(LOG_TRACE) << "Started new query wait timer with "
+                << DrillClientConfig::getQueryTimeout() << " seconds." <<
std::endl;
+        m_deadlineTimer.expires_from_now(boost::posix_time::seconds(DrillClientConfig::getQueryTimeout()));
+        m_deadlineTimer.async_wait(boost::bind(
+            &DrillClientImpl::handleReadTimeout,
+            this,
+            boost::asio::placeholders::error
+            ));
+    }
 
     async_read(
             this->m_socket,
@@ -677,9 +686,9 @@ status_t DrillClientImpl::processQueryStatusResult(exec::shared::QueryResult*
qr
             case exec::shared::QueryResult_QueryState_COMPLETED:
                 {
                     //Not clean to call the handleTerminatedQryState method
-                    //because it signals an error to the listener. 
+                    //because it signals an error to the listener.
                     //The ODBC driver expects this though and the sync API
-                    //handles this (luckily). 
+                    //handles this (luckily).
                     ret=handleTerminatedQryState(ret,
                             getMessage(ERR_QRY_COMPLETED),
                             pDrillClientQueryResult);
@@ -700,16 +709,17 @@ status_t DrillClientImpl::processQueryStatusResult(exec::shared::QueryResult*
qr
 
 void DrillClientImpl::handleReadTimeout(const boost::system::error_code & err){
     // if err == boost::asio::error::operation_aborted) then the caller cancelled the timer.
-    if(!err){
+    if(err != boost::asio::error::operation_aborted){
+
         // Check whether the deadline has passed.
         if (m_deadlineTimer.expires_at() <= boost::asio::deadline_timer::traits_type::now()){
             // The deadline has passed.
-            handleQryError(QRY_COMM_ERROR, getMessage(ERR_QRY_TIMOUT), NULL);
+            DRILL_LOG(LOG_TRACE) << "DrillClientImpl::handleReadTimeout: Deadline timer
expired; ERR_QRY_TIMOUT. \n";
+            handleQryError(QRY_TIMEOUT, getMessage(ERR_QRY_TIMOUT), NULL);
             // There is no longer an active deadline. The expiry is set to positive
             // infinity so that the timer never expires until a new deadline is set.
             // Note that at this time, the caller is not in a (async) wait for the timer.
             m_deadlineTimer.expires_at(boost::posix_time::pos_infin);
-            DRILL_LOG(LOG_TRACE) << "Deadline timer expired."  << std::endl;
             // Cancel all pending async IOs.
             // The cancel call _MAY_ not work on all platforms. To be a little more reliable
we need
             // to have the BOOST_ASIO_ENABLE_CANCELIO macro (as well as the BOOST_ASIO_DISABLE_IOCP
macro?)
@@ -725,11 +735,13 @@ void DrillClientImpl::handleRead(ByteBuf_t _buf,
         const boost::system::error_code& err,
         size_t bytes_transferred) {
     boost::system::error_code error=err;
-    // cancel the timer
     DRILL_LOG(LOG_TRACE) << "DrillClientImpl::handleRead: Handle Read from buffer "
         <<  reinterpret_cast<int*>(_buf) << std::endl;
-    m_deadlineTimer.cancel();
-    DRILL_LOG(LOG_TRACE) << "Deadline timer cancelled."  << std::endl;
+    if(DrillClientConfig::getQueryTimeout() > 0){
+        // Cancel the timeout if handleRead is called
+        DRILL_LOG(LOG_TRACE) << "DrillClientImpl::handleRead: Cancel deadline timer.\n";
+        m_deadlineTimer.cancel();
+    }
     if(!error){
         InBoundRpcMessage msg;
 

http://git-wip-us.apache.org/repos/asf/drill/blob/0553798c/contrib/native/client/src/clientlib/drillClientImpl.hpp
----------------------------------------------------------------------
diff --git a/contrib/native/client/src/clientlib/drillClientImpl.hpp b/contrib/native/client/src/clientlib/drillClientImpl.hpp
index a5eeb77..fdcf178 100644
--- a/contrib/native/client/src/clientlib/drillClientImpl.hpp
+++ b/contrib/native/client/src/clientlib/drillClientImpl.hpp
@@ -211,7 +211,7 @@ class DrillClientImpl{
             m_deadlineTimer.cancel();
             m_io_service.stop();
             boost::system::error_code ignorederr;
-            m_socket.shutdown(boost::asio::ip::tcp::socket::shutdown_send, ignorederr);
+            m_socket.shutdown(boost::asio::ip::tcp::socket::shutdown_both, ignorederr);
             m_socket.close();
             if(m_rbuf!=NULL){
                 Utils::freeBuffer(m_rbuf, MAX_SOCK_RD_BUFSIZE); m_rbuf=NULL;
@@ -235,7 +235,7 @@ class DrillClientImpl{
         DrillClientError* getError(){ return m_pError;}
         DrillClientQueryResult* SubmitQuery(::exec::shared::QueryType t, const std::string&
plan, pfnQueryResultsListener listener, void* listenerCtx);
         void waitForResults();
-        bool validateHandShake(const char* defaultSchema);
+        connectionStatus_t validateHandShake(const char* defaultSchema);
 
     private:
         friend class DrillClientQueryResult;
@@ -341,7 +341,7 @@ inline void DrillClientImpl::Close() {
     //TODO: cancel pending query
     if(this->m_bIsConnected){
         boost::system::error_code ignorederr;
-        m_socket.shutdown(boost::asio::ip::tcp::socket::shutdown_send, ignorederr);
+        m_socket.shutdown(boost::asio::ip::tcp::socket::shutdown_both, ignorederr);
         m_socket.close();
         m_bIsConnected=false;
     }

http://git-wip-us.apache.org/repos/asf/drill/blob/0553798c/contrib/native/client/src/clientlib/errmsgs.cpp
----------------------------------------------------------------------
diff --git a/contrib/native/client/src/clientlib/errmsgs.cpp b/contrib/native/client/src/clientlib/errmsgs.cpp
index a5e7217..fa72721 100644
--- a/contrib/native/client/src/clientlib/errmsgs.cpp
+++ b/contrib/native/client/src/clientlib/errmsgs.cpp
@@ -40,6 +40,7 @@ static Drill::ErrorMessages errorMessages[]={
     {ERR_CONN_ZKNODBIT, ERR_CATEGORY_CONN, 0, "No drillbit found with this Zookeeper."},
     {ERR_CONN_ZKNOAUTH, ERR_CATEGORY_CONN, 0, "Authentication failed."},
     {ERR_CONN_ZKEXP, ERR_CATEGORY_CONN, 0, "Session expired."},
+    {ERR_CONN_HSHAKETIMOUT, ERR_CATEGORY_CONN, 0, "Handshake Timeout."},
     {ERR_QRY_OUTOFMEM, ERR_CATEGORY_QRY, 0, "Out of memory."},
     {ERR_QRY_COMMERR, ERR_CATEGORY_QRY, 0, "Communication error. %s"},
     {ERR_QRY_INVREADLEN, ERR_CATEGORY_QRY, 0, "Internal Error: Received a message with an
invalid read length."},

http://git-wip-us.apache.org/repos/asf/drill/blob/0553798c/contrib/native/client/src/clientlib/errmsgs.hpp
----------------------------------------------------------------------
diff --git a/contrib/native/client/src/clientlib/errmsgs.hpp b/contrib/native/client/src/clientlib/errmsgs.hpp
index 9a69f21..22e544f 100644
--- a/contrib/native/client/src/clientlib/errmsgs.hpp
+++ b/contrib/native/client/src/clientlib/errmsgs.hpp
@@ -45,7 +45,8 @@ namespace Drill{
 #define ERR_CONN_ZKNODBIT       DRILL_ERR_START+12
 #define ERR_CONN_ZKNOAUTH       DRILL_ERR_START+13
 #define ERR_CONN_ZKEXP          DRILL_ERR_START+14
-#define ERR_CONN_MAX            DRILL_ERR_START+14
+#define ERR_CONN_HSHAKETIMOUT   DRILL_ERR_START+15
+#define ERR_CONN_MAX            DRILL_ERR_START+15
 
 #define ERR_QRY_OUTOFMEM    ERR_CONN_MAX+1
 #define ERR_QRY_COMMERR     ERR_CONN_MAX+2

http://git-wip-us.apache.org/repos/asf/drill/blob/0553798c/contrib/native/client/src/include/drill/common.hpp
----------------------------------------------------------------------
diff --git a/contrib/native/client/src/include/drill/common.hpp b/contrib/native/client/src/include/drill/common.hpp
index f83aae4..824d670 100644
--- a/contrib/native/client/src/include/drill/common.hpp
+++ b/contrib/native/client/src/include/drill/common.hpp
@@ -78,7 +78,8 @@ typedef enum{
     QRY_COMPLETED = 11,
     QRY_CANCELED = 12,
     QRY_FAILED = 13,
-    QRY_UNKNOWN_QUERY = 14
+    QRY_UNKNOWN_QUERY = 14,
+    QRY_TIMEOUT = 15
 } status_t;
 
 typedef enum{
@@ -86,7 +87,8 @@ typedef enum{
     CONN_FAILURE=1,
     CONN_HANDSHAKE_FAILED=2,
     CONN_INVALID_INPUT=3,
-    CONN_ZOOKEEPER_ERROR=4
+    CONN_ZOOKEEPER_ERROR=4,
+    CONN_HANDSHAKE_TIMEOUT=5
 } connectionStatus_t;
 
 typedef enum{

http://git-wip-us.apache.org/repos/asf/drill/blob/0553798c/contrib/native/client/src/include/drill/drillClient.hpp
----------------------------------------------------------------------
diff --git a/contrib/native/client/src/include/drill/drillClient.hpp b/contrib/native/client/src/include/drill/drillClient.hpp
index 0204855..19fec69 100644
--- a/contrib/native/client/src/include/drill/drillClient.hpp
+++ b/contrib/native/client/src/include/drill/drillClient.hpp
@@ -99,7 +99,11 @@ class DECLSPEC_DRILL_CLIENT DrillClientConfig{
         static void setBufferLimit(uint64_t l);
         static uint64_t getBufferLimit();
         static void setSocketTimeout(int32_t l);
+        static void setHandshakeTimeout(int32_t l);
+        static void setQueryTimeout(int32_t l);
         static int32_t getSocketTimeout();
+        static int32_t getHandshakeTimeout();
+        static int32_t getQueryTimeout();
         static logLevel_t getLogLevel();
     private:
         // The logging level
@@ -107,8 +111,26 @@ class DECLSPEC_DRILL_CLIENT DrillClientConfig{
         // The total amount of memory to be allocated by an instance of DrillClient.
         // For future use. Currently, not enforced.
         static uint64_t s_bufferLimit;
-        // Timeout (in seconds) for asynchronous read operations. Default is 180 seconds
+
+        /**
+         * DrillClient configures timeout (in seconds) in a fine granularity.
+         * Disabled by setting the value to zero.
+         *
+         * s_socketTimout: (default 0)
+         *      set SO_RCVTIMEO and SO_SNDTIMEO socket options and place a
+         *		timeout on socket receives and sends. It is disabled by default.
+         *
+         * s_handshakeTimeout: (default 5)
+         *      place a timeout on validating handshake. When an endpoint (host:port)
+         *		is reachable but drillbit hangs or running another service. It will
+         *		avoid the client hanging.
+         *
+         * s_queryTimeout: (default 180)
+         *      place a timeout on waiting result of querying.
+         */
         static int32_t s_socketTimeout;
+        static int32_t s_handshakeTimeout;
+        static int32_t s_queryTimeout;
         static boost::mutex s_mutex;
 };
 


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