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From cmcc...@apache.org
Subject hadoop git commit: HDFS-6994. use libexpat instead of libxml2 for libhdfs3 (cmccabe)
Date Mon, 15 Dec 2014 20:58:58 GMT
Repository: hadoop
Updated Branches:
  refs/heads/HDFS-6994 4bacfb5e7 -> 411c31fab


HDFS-6994. use libexpat instead of libxml2 for libhdfs3 (cmccabe)


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/411c31fa
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/411c31fa
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/411c31fa

Branch: refs/heads/HDFS-6994
Commit: 411c31fabac8d53d2d94f15b332d5ea2d9623607
Parents: 4bacfb5
Author: Colin Patrick Mccabe <cmccabe@cloudera.com>
Authored: Tue Nov 11 17:33:49 2014 -0800
Committer: Colin Patrick Mccabe <cmccabe@cloudera.com>
Committed: Mon Dec 15 12:10:34 2014 -0800

----------------------------------------------------------------------
 .../src/contrib/libhdfs3/CMakeLists.txt         |   1 +
 .../hadoop-hdfs/src/contrib/libhdfs3/bootstrap  |   2 +-
 .../src/contrib/libhdfs3/src/CMakeLists.txt     |   3 +
 .../contrib/libhdfs3/src/client/FileSystem.cc   |  10 +-
 .../contrib/libhdfs3/src/client/FileSystem.h    |   2 +-
 .../libhdfs3/src/client/FileSystemImpl.cc       |   3 +-
 .../src/contrib/libhdfs3/src/common/Atoi.cc     | 108 ++++++
 .../src/contrib/libhdfs3/src/common/Atoi.h      |  40 +++
 .../src/contrib/libhdfs3/src/common/Config.cc   | 228 ++++++------
 .../src/contrib/libhdfs3/src/common/Config.h    |  64 +---
 .../contrib/libhdfs3/src/common/ConfigImpl.cc   | 291 ---------------
 .../contrib/libhdfs3/src/common/ConfigImpl.h    | 165 ---------
 .../libhdfs3/src/common/SessionConfig.cc        |  38 +-
 .../contrib/libhdfs3/src/common/SessionConfig.h |   8 +-
 .../src/contrib/libhdfs3/src/common/Status.h    |   8 +
 .../contrib/libhdfs3/src/common/StringUtil.h    |   8 +
 .../libhdfs3/src/common/XmlConfigParser.cc      | 360 ++++++++++++++-----
 .../libhdfs3/src/common/XmlConfigParser.h       |  48 ++-
 .../contrib/libhdfs3/src/server/NamenodeInfo.cc |  24 +-
 19 files changed, 630 insertions(+), 781 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/CMakeLists.txt
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/CMakeLists.txt b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/CMakeLists.txt
index 8d73871..4bf220e 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/CMakeLists.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/CMakeLists.txt
@@ -37,6 +37,7 @@ FIND_PACKAGE(LibXml2 REQUIRED)
 FIND_PACKAGE(Protobuf REQUIRED)
 FIND_PACKAGE(KERBEROS REQUIRED)
 FIND_PACKAGE(GSasl REQUIRED)
+FIND_PACKAGE(EXPAT REQUIRED)
 
 ADD_SUBDIRECTORY(mock)
 ADD_SUBDIRECTORY(src)

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/bootstrap
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/bootstrap b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/bootstrap
index 19d2cc6..4f66065 100755
--- a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/bootstrap
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/bootstrap
@@ -45,7 +45,7 @@ Dependencies:
     protobuf        https://code.google.com/p/protobuf/
     kerberos        http://web.mit.edu/kerberos/
     libgsasl        http://www.gnu.org/software/gsasl/
-    libxml2         http://xmlsoft.org/
+    expat           http://expat.sourceforge.net/
     libuuid         http://sourceforge.net/projects/libuuid/
     boost 1.53+     http://www.boost.org/
                     [boost is not required if c++ compiler is g++ 4.6.0+ or clang++ with stdc++]

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/CMakeLists.txt
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/CMakeLists.txt b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/CMakeLists.txt
index 4ee279a..aa6ce01 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/CMakeLists.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/CMakeLists.txt
@@ -106,16 +106,19 @@ INCLUDE_DIRECTORIES(${LIBXML2_INCLUDE_DIR})
 INCLUDE_DIRECTORIES(${KERBEROS_INCLUDE_DIRS})
 INCLUDE_DIRECTORIES(${GSASL_INCLUDE_DIR})
 INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR}/mock)
+INCLUDE_DIRECTORIES(${EXPAT_INCLUDE_DIR})
 
 TARGET_LINK_LIBRARIES(libhdfs3-static ${PROTOBUF_LIBRARIES})
 TARGET_LINK_LIBRARIES(libhdfs3-static ${LIBXML2_LIBRARIES})
 TARGET_LINK_LIBRARIES(libhdfs3-static ${KERBEROS_LIBRARIES})
 TARGET_LINK_LIBRARIES(libhdfs3-static ${GSASL_LIBRARIES})
+TARGET_LINK_LIBRARIES(libhdfs3-static ${EXPAT_LIBRARIES})
 
 TARGET_LINK_LIBRARIES(libhdfs3-shared ${PROTOBUF_LIBRARIES})
 TARGET_LINK_LIBRARIES(libhdfs3-shared ${LIBXML2_LIBRARIES})
 TARGET_LINK_LIBRARIES(libhdfs3-shared ${KERBEROS_LIBRARIES})
 TARGET_LINK_LIBRARIES(libhdfs3-shared ${GSASL_LIBRARIES})
+TARGET_LINK_LIBRARIES(libhdfs3-shared ${EXPAT_LIBRARIES})
 
 SET_TARGET_PROPERTIES(libhdfs3-static PROPERTIES OUTPUT_NAME "hdfs3")
 SET_TARGET_PROPERTIES(libhdfs3-shared PROPERTIES OUTPUT_NAME "hdfs3")

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/client/FileSystem.cc
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/client/FileSystem.cc b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/client/FileSystem.cc
index 031ea09..120e228 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/client/FileSystem.cc
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/client/FileSystem.cc
@@ -131,7 +131,7 @@ static std::string ExtractPrincipalFromToken(const Token &token) {
 }
 }
 
-FileSystem::FileSystem(const Config &conf) : conf(conf) {
+FileSystem::FileSystem(const Config &conf) : conf_(conf) {
 }
 
 FileSystem::~FileSystem() {
@@ -140,7 +140,7 @@ FileSystem::~FileSystem() {
 
 Status FileSystem::connect() {
     try {
-        internal::SessionConfig sconf(*conf.impl);
+        internal::SessionConfig sconf(conf_);
         return connect(sconf.getDefaultUri().c_str(), NULL, NULL);
     } catch (...) {
         return CreateStatusFromException(current_exception());
@@ -183,14 +183,14 @@ Status FileSystem::connect(const std::string &uri, const std::string &username,
     CHECK_PARAMETER(!impl, EIO, "FileSystem: already connected.");
 
     try {
-        SessionConfig sconf(*conf.impl);
+        SessionConfig sconf(conf_);
         auth = RpcAuth::ParseMethod(sconf.getRpcAuthMethod());
 
         if (!token.empty() && auth != AuthMethod::SIMPLE) {
             Token t;
             t.fromString(token);
             principal = ExtractPrincipalFromToken(t);
-            impl = ConnectInternal(uri, principal, &t, conf);
+            impl = ConnectInternal(uri, principal, &t, conf_);
             impl->connect();
             return Status::OK();
         } else if (!username.empty()) {
@@ -202,7 +202,7 @@ Status FileSystem::connect(const std::string &uri, const std::string &username,
                 ExtractPrincipalFromTicketCache(sconf.getKerberosCachePath());
         }
 
-        impl = ConnectInternal(uri, principal, NULL, conf);
+        impl = ConnectInternal(uri, principal, NULL, conf_);
         impl->connect();
     } catch (...) {
         impl.reset();

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/client/FileSystem.h
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/client/FileSystem.h b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/client/FileSystem.h
index c40e753..f73da19 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/client/FileSystem.h
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/client/FileSystem.h
@@ -267,7 +267,7 @@ public:
 private:
     FileSystem(const FileSystem &other);
     FileSystem &operator=(const FileSystem &other);
-    Config conf;
+    Config conf_;
     hdfs::internal::shared_ptr<internal::FileSystemImpl> impl;
 
     friend class InputStream;

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/client/FileSystemImpl.cc
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/client/FileSystemImpl.cc b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/client/FileSystemImpl.cc
index cd58e67..a51b62a 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/client/FileSystemImpl.cc
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/client/FileSystemImpl.cc
@@ -34,7 +34,6 @@
 #include <cstring>
 #include <deque>
 #include <inttypes.h>
-#include <libxml/uri.h>
 #include <strings.h>
 
 using std::string;
@@ -99,7 +98,7 @@ FileSystemImpl::FileSystemImpl(const FileSystemKey &key, const Config &c)
       key(key),
       leaseRenewer(this),
       nn(NULL),
-      sconf(*c.impl),
+      sconf(c),
       user(key.getUser()) {
     static atomic<uint32_t> count(0);
     std::stringstream ss;

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Atoi.cc
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Atoi.cc b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Atoi.cc
new file mode 100644
index 0000000..afc3de0
--- /dev/null
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Atoi.cc
@@ -0,0 +1,108 @@
+/**
+ * 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.
+ */
+
+#include "Atoi.h"
+#include "Status.h"
+
+#include <limits>
+#include <sstream>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string>
+
+using hdfs::Status;
+using std::ostringstream;
+
+Status StrToInt32(const char *str, int32_t *ret) {
+    long retval;
+    char *end = NULL;
+    errno = 0;
+    retval = strtol(str, &end, 0);
+
+    if (EINVAL == errno || 0 != *end) {
+        ostringstream oss;
+        oss << "Invalid int32_t type: " << str;
+        return Status(EINVAL, oss.str());
+    }
+    if (ERANGE == errno || retval > std::numeric_limits<int32_t>::max() ||
+        retval < std::numeric_limits<int32_t>::min()) {
+        ostringstream oss;
+        oss << "Underflow/Overflow in int32_t type: " << str;
+        return Status(EINVAL, oss.str());
+    }
+    *ret = retval;
+    return Status::OK();
+}
+
+Status StrToInt64(const char *str, int64_t *ret) {
+    long long retval;
+    char *end = NULL;
+    errno = 0;
+    retval = strtoll(str, &end, 0);
+
+    if (EINVAL == errno || 0 != *end) {
+        ostringstream oss;
+        oss << "Invalid int64_t type: " << str;
+        return Status(EINVAL, oss.str());
+    }
+    if (ERANGE == errno || retval > std::numeric_limits<int64_t>::max() ||
+        retval < std::numeric_limits<int64_t>::min()) {
+        ostringstream oss;
+        oss << "Underflow/Overflow in int64_t type: " << str;
+        return Status(EINVAL, oss.str());
+    }
+    *ret = retval;
+    return Status::OK();
+}
+
+Status StrToBool(const char *str, bool *ret) {
+    bool retval = false;
+
+    if (!strcasecmp(str, "true") || !strcmp(str, "1")) {
+        retval = true;
+    } else if (!strcasecmp(str, "false") || !strcmp(str, "0")) {
+        retval = false;
+    } else {
+        ostringstream oss;
+        oss << "Invalid bool type: " << str;
+        return Status(EINVAL, oss.str());
+    }
+    *ret = retval;
+    return Status::OK();
+}
+
+Status StrToDouble(const char *str, double *ret) {
+    double retval;
+    char *end = NULL;
+    errno = 0;
+    retval = strtod(str, &end);
+
+    if (EINVAL == errno || 0 != *end) {
+        ostringstream oss;
+        oss << "Invalid double type: " << str;
+        return Status(EINVAL, oss.str());
+    }
+    if (ERANGE == errno || retval > std::numeric_limits<double>::max() ||
+        retval < std::numeric_limits<double>::min()) {
+        ostringstream oss;
+        oss << "Underflow/Overflow in double type: " << str;
+        return Status(EINVAL, oss.str());
+    }
+    *ret = retval;
+    return Status::OK();
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Atoi.h
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Atoi.h b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Atoi.h
new file mode 100644
index 0000000..3ebb1b6
--- /dev/null
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Atoi.h
@@ -0,0 +1,40 @@
+/**
+ * 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.
+ */
+
+#ifndef _HDFS_LIBHDFS3_COMMON_ATOI_H_
+#define _HDFS_LIBHDFS3_COMMON_ATOI_H_
+
+#include "StatusInternal.h"
+
+#include <stdint.h>
+
+namespace hdfs {
+namespace internal {
+
+  Status StrToInt32(const char *str, int32_t *ret);
+
+  Status StrToInt64(const char *str, int64_t *ret);
+
+  Status StrToBool(const char *str, bool *ret);
+
+  Status StrToDouble(const char *str, double *ret);
+
+}
+}
+
+#endif

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Config.cc
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Config.cc b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Config.cc
index 3e1e841..3633292 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Config.cc
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Config.cc
@@ -16,198 +16,182 @@
  * limitations under the License.
  */
 
+#include "Atoi.h"
 #include "Config.h"
-#include "ConfigImpl.h"
-#include "XmlConfigParser.h"
 #include "StatusInternal.h"
 
-using namespace hdfs::internal;
-
-namespace hdfs {
-
-Config Config::CreateFromXmlFile(const std::string &path) {
-    return Config(new ConfigImpl(XmlConfigParser(path.c_str()).getKeyValue()));
-}
-
-Config::Config() : impl(new ConfigImpl) {
-}
-
-Config::Config(const Config &other) {
-    impl = new ConfigImpl(*other.impl);
-}
+#include <inttypes.h>
+#include <map>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string>
 
-Config::Config(ConfigImpl *impl) : impl(impl) {
-}
-
-Config &Config::operator=(const Config &other) {
-    if (this == &other) {
-        return *this;
-    }
+using namespace hdfs::internal;
+using std::string;
 
-    ConfigImpl *temp = impl;
-    impl = new ConfigImpl(*other.impl);
-    delete temp;
-    return *this;
-}
+typedef std::map<std::string, std::string> map_t;
 
-bool Config::operator==(const Config &other) const {
-    if (this == &other) {
-        return true;
-    }
 
-    return *impl == *other.impl;
-}
+namespace hdfs {
 
-Config::~Config() {
-    delete impl;
+Config::Config() {
 }
 
 Status Config::getString(const std::string &key, std::string *output) const {
-    CHECK_PARAMETER(NULL != output, EINVAL, "invalid parameter \"output\"");
-
-    try {
-        *output = impl->getString(key.c_str());
-    } catch (...) {
-        return CreateStatusFromException(current_exception());
+    map_t::const_iterator i = map_.find(key);
+    if (i == map_.end()) {
+        return Status(ENOENT, "Configuration key " + key + " was not found.");
     }
-
+    *output = i->second;
     return Status::OK();
 }
 
 Status Config::getString(const std::string &key, const std::string &def,
                          std::string *output) const {
-    CHECK_PARAMETER(NULL != output, EINVAL, "invalid parameter \"output\"");
-
-    try {
-        *output = impl->getString(key.c_str(), def.c_str());
-    } catch (...) {
-        return CreateStatusFromException(current_exception());
+    map_t::const_iterator i = map_.find(key);
+    if (i == map_.end()) {
+        *output = def;
     }
-
+    *output = i->second;
     return Status::OK();
 }
 
-Status Config::getInt64(const std::string &key, std::string *output) const {
-    CHECK_PARAMETER(NULL != output, EINVAL, "invalid parameter \"output\"");
-
-    try {
-        *output = impl->getInt64(key.c_str());
-    } catch (...) {
-        return CreateStatusFromException(current_exception());
+Status Config::getInt64(const std::string &key, int64_t *output) const {
+    string out;
+    Status status = getString(key, &out);
+    if (status.isError()) {
+        return status;
+    }
+    status = StrToInt64(out.c_str(), output);
+    if (status.isError()) {
+        return status;
     }
-
     return Status::OK();
 }
 
 Status Config::getInt64(const std::string &key, int64_t def,
-                        std::string *output) const {
-    CHECK_PARAMETER(NULL != output, EINVAL, "invalid parameter \"output\"");
-
-    try {
-        *output = impl->getInt64(key.c_str(), def);
-    } catch (...) {
-        return CreateStatusFromException(current_exception());
+                        int64_t *output) const {
+    string out;
+    Status status = getString(key, &out);
+    if (status.isError()) {
+        *output = def;
+        return Status::OK();
+    }
+    status = StrToInt64(out.c_str(), output);
+    if (status.isError()) {
+        return status;
     }
-
     return Status::OK();
 }
 
-Status Config::getInt32(const std::string &key, std::string *output) const {
-    CHECK_PARAMETER(NULL != output, EINVAL, "invalid parameter \"output\"");
-
-    try {
-        *output = impl->getInt32(key.c_str());
-    } catch (...) {
-        return CreateStatusFromException(current_exception());
+Status Config::getInt32(const std::string &key, int32_t *output) const {
+    std::string out;
+    Status status = getString(key, &out);
+    if (status.isError()) {
+        return status;
+    }
+    status = StrToInt32(out.c_str(), output);
+    if (status.isError()) {
+        return status;
     }
-
     return Status::OK();
 }
 
 Status Config::getInt32(const std::string &key, int32_t def,
-                        std::string *output) const {
-    CHECK_PARAMETER(NULL != output, EINVAL, "invalid parameter \"output\"");
-
-    try {
-        *output = impl->getInt32(key.c_str(), def);
-    } catch (...) {
-        return CreateStatusFromException(current_exception());
+                        int32_t *output) const {
+    string out;
+    Status status = getString(key, &out);
+    if (status.isError()) {
+        *output = def;
+        return Status::OK();
+    }
+    status = StrToInt32(out.c_str(), output);
+    if (status.isError()) {
+        return status;
     }
-
     return Status::OK();
 }
 
-Status Config::getDouble(const std::string &key, std::string *output) const {
-    CHECK_PARAMETER(NULL != output, EINVAL, "invalid parameter \"output\"");
-
-    try {
-        *output = impl->getDouble(key.c_str());
-    } catch (...) {
-        return CreateStatusFromException(current_exception());
+Status Config::getDouble(const std::string &key, double *output) const {
+    string out;
+    Status status = getString(key, &out);
+    if (status.isError()) {
+        return status;
+    }
+    status = StrToDouble(out.c_str(), output);
+    if (status.isError()) {
+        return status;
     }
-
     return Status::OK();
 }
 
 Status Config::getDouble(const std::string &key, double def,
-                         std::string *output) const {
-    CHECK_PARAMETER(NULL != output, EINVAL, "invalid parameter \"output\"");
-
-    try {
-        *output = impl->getDouble(key.c_str(), def);
-    } catch (...) {
-        return CreateStatusFromException(current_exception());
+                         double *output) const {
+    string out;
+    Status status = getString(key, &out);
+    if (status.isError()) {
+        *output = def;
+        return Status::OK();
+    }
+    status = StrToDouble(out.c_str(), output);
+    if (status.isError()) {
+        return status;
     }
-
     return Status::OK();
 }
 
-Status Config::getBool(const std::string &key, std::string *output) const {
-    CHECK_PARAMETER(NULL != output, EINVAL, "invalid parameter \"output\"");
-
-    try {
-        *output = impl->getBool(key.c_str());
-    } catch (...) {
-        return CreateStatusFromException(current_exception());
+Status Config::getBool(const std::string &key, bool *output) const {
+    string out;
+    Status status = getString(key, &out);
+    if (status.isError()) {
+        return status;
+    }
+    status = StrToBool(out.c_str(), output);
+    if (status.isError()) {
+        return status;
     }
-
     return Status::OK();
 }
 
 Status Config::getBool(const std::string &key, bool def,
-                       std::string *output) const {
-    CHECK_PARAMETER(NULL != output, EINVAL, "invalid parameter \"output\"");
-
-    try {
-        *output = impl->getBool(key.c_str(), def);
-    } catch (...) {
-        return CreateStatusFromException(current_exception());
+                       bool *output) const {
+    string out;
+    Status status = getString(key, &out);
+    if (status.isError()) {
+        *output = def;
+        return Status::OK();
+    }
+    status = StrToBool(out.c_str(), output);
+    if (status.isError()) {
+        return status;
     }
-
     return Status::OK();
 }
 
 void Config::set(const std::string &key, const std::string &value) {
-    impl->set(key.c_str(), value);
+    map_[key] = value;
 }
 
 void Config::set(const std::string &key, int32_t value) {
-    impl->set(key.c_str(), value);
+    char buf[32];
+    snprintf(buf, sizeof(buf), "%" PRId32, value);
+    set(key.c_str(), string(buf));
 }
 
 void Config::set(const std::string &key, int64_t value) {
-    impl->set(key.c_str(), value);
+    char buf[64];
+    snprintf(buf, sizeof(buf), "%" PRId64, value);
+    set(key.c_str(), string(buf));
 }
 
 void Config::set(const std::string &key, double value) {
-    impl->set(key.c_str(), value);
+    char buf[64];
+    snprintf(buf, sizeof(buf), "%f", value);
+    set(key.c_str(), string(buf));
 }
 
 void Config::set(const std::string &key, bool value) {
-    impl->set(key.c_str(), value);
+    set(key.c_str(), value ? string("true") : string("false"));
 }
 
-size_t Config::hash_value() const {
-    return impl->hash_value();
-}
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Config.h
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Config.h b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Config.h
index 4359e3f..29017aa 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Config.h
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Config.h
@@ -27,49 +27,15 @@
 
 namespace hdfs {
 
-class FileSystem;
-class NamenodeInfo;
-
-namespace internal {
-class ConfigImpl;
-class FileSystemImpl;
-}
-
 /**
  * A configure file parser.
  */
 class Config {
 public:
     /**
-     * Create an instance from a XML file
-     * @param path the path of the configure file.
-     */
-    static Config CreateFromXmlFile(const std::string &path);
-
-    /**
      * Construct a empty Config instance.
      */
-    Config();
-
-    /**
-     * Copy constructor
-     */
-    Config(const Config &other);
-
-    /**
-     * Assignment operator.
-     */
-    Config &operator=(const Config &other);
-
-    /**
-     * Operator equal
-     */
-    bool operator==(const Config &other) const;
-
-    /**
-     * Destroy this instance
-     */
-    ~Config();
+    explicit Config();
 
     /**
      * Get a string with given configure key.
@@ -96,7 +62,7 @@ public:
      * @param output the pointer of the output parameter.
      * @return the result status of this operation
      */
-    Status getInt64(const std::string &key, std::string *output) const;
+    Status getInt64(const std::string &key, int64_t *output) const;
 
     /**
      * Get a 64 bit integer with given configure key.
@@ -107,7 +73,7 @@ public:
      * @return the result status of this operation
      */
     Status getInt64(const std::string &key, int64_t def,
-                    std::string *output) const;
+                    int64_t *output) const;
 
     /**
      * Get a 32 bit integer with given configure key.
@@ -115,7 +81,7 @@ public:
      * @param output the pointer of the output parameter.
      * @return the result status of this operation
      */
-    Status getInt32(const std::string &key, std::string *output) const;
+    Status getInt32(const std::string &key, int32_t *output) const;
 
     /**
      * Get a 32 bit integer with given configure key.
@@ -126,7 +92,7 @@ public:
      * @return the result status of this operation
      */
     Status getInt32(const std::string &key, int32_t def,
-                    std::string *output) const;
+                    int32_t *output) const;
 
     /**
      * Get a double with given configure key.
@@ -134,7 +100,7 @@ public:
      * @param output the pointer of the output parameter.
      * @return the result status of this operation
      */
-    Status getDouble(const std::string &key, std::string *output) const;
+    Status getDouble(const std::string &key, double *output) const;
 
     /**
      * Get a double with given configure key.
@@ -145,7 +111,7 @@ public:
      * @return the result status of this operation
      */
     Status getDouble(const std::string &key, double def,
-                     std::string *output) const;
+                     double *output) const;
 
     /**
      * Get a boolean with given configure key.
@@ -153,7 +119,7 @@ public:
      * @param output the pointer of the output parameter.
      * @return the result status of this operation
      */
-    Status getBool(const std::string &key, std::string *output) const;
+    Status getBool(const std::string &key, bool *output) const;
 
     /**
      * Get a boolean with given configure key.
@@ -163,7 +129,7 @@ public:
      * @param output the pointer of the output parameter.
      * @return the result status of this operation
      */
-    Status getBool(const std::string &key, bool def, std::string *output) const;
+    Status getBool(const std::string &key, bool def, bool *output) const;
 
     /**
      * Set a configure item
@@ -200,18 +166,8 @@ public:
      */
     void set(const std::string &key, bool value);
 
-    /**
-     * Get the hash value of this object
-     * @return The hash value
-     */
-    size_t hash_value() const;
-
 private:
-    Config(hdfs::internal::ConfigImpl *impl);
-    hdfs::internal::ConfigImpl *impl;
-    friend class hdfs::FileSystem;
-    friend class hdfs::internal::FileSystemImpl;
-    friend class hdfs::NamenodeInfo;
+    std::map<std::string, std::string> map_;
 };
 }
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/ConfigImpl.cc
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/ConfigImpl.cc b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/ConfigImpl.cc
deleted file mode 100644
index 7bfb3ec..0000000
--- a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/ConfigImpl.cc
+++ /dev/null
@@ -1,291 +0,0 @@
-/**
- * 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.
- */
-
-#include "Exception.h"
-#include "ExceptionInternal.h"
-#include "Hash.h"
-#include "ConfigImpl.h"
-
-#include <cassert>
-#include <errno.h>
-#include <fstream>
-#include <limits>
-#include <string.h>
-#include <unistd.h>
-#include <vector>
-
-using std::map;
-using std::string;
-using std::vector;
-
-namespace hdfs {
-namespace internal {
-
-typedef map<string, string>::const_iterator Iterator;
-typedef map<string, string> Map;
-
-static int32_t StrToInt32(const char *str) {
-    long retval;
-    char *end = NULL;
-    errno = 0;
-    retval = strtol(str, &end, 0);
-
-    if (EINVAL == errno || 0 != *end) {
-        THROW(HdfsBadNumFoumat, "Invalid int32_t type: %s", str);
-    }
-
-    if (ERANGE == errno || retval > std::numeric_limits<int32_t>::max() ||
-        retval < std::numeric_limits<int32_t>::min()) {
-        THROW(HdfsBadNumFoumat, "Underflow/Overflow int32_t type: %s", str);
-    }
-
-    return retval;
-}
-
-static int64_t StrToInt64(const char *str) {
-    long long retval;
-    char *end = NULL;
-    errno = 0;
-    retval = strtoll(str, &end, 0);
-
-    if (EINVAL == errno || 0 != *end) {
-        THROW(HdfsBadNumFoumat, "Invalid int64_t type: %s", str);
-    }
-
-    if (ERANGE == errno || retval > std::numeric_limits<int64_t>::max() ||
-        retval < std::numeric_limits<int64_t>::min()) {
-        THROW(HdfsBadNumFoumat, "Underflow/Overflow int64_t type: %s", str);
-    }
-
-    return retval;
-}
-
-static bool StrToBool(const char *str) {
-    bool retval = false;
-
-    if (!strcasecmp(str, "true") || !strcmp(str, "1")) {
-        retval = true;
-    } else if (!strcasecmp(str, "false") || !strcmp(str, "0")) {
-        retval = false;
-    } else {
-        THROW(HdfsBadBoolFoumat, "Invalid bool type: %s", str);
-    }
-
-    return retval;
-}
-
-static double StrToDouble(const char *str) {
-    double retval;
-    char *end = NULL;
-    errno = 0;
-    retval = strtod(str, &end);
-
-    if (EINVAL == errno || 0 != *end) {
-        THROW(HdfsBadNumFoumat, "Invalid double type: %s", str);
-    }
-
-    if (ERANGE == errno || retval > std::numeric_limits<double>::max() ||
-        retval < std::numeric_limits<double>::min()) {
-        THROW(HdfsBadNumFoumat, "Underflow/Overflow int64_t type: %s", str);
-    }
-
-    return retval;
-}
-
-ConfigImpl::ConfigImpl(const Map &kv) : kv(kv) {
-}
-
-const char *ConfigImpl::getString(const std::string &key) const {
-    Iterator it = kv.find(key.c_str());
-
-    if (kv.end() == it) {
-        THROW(HdfsConfigNotFound, "ConfigImpl key: %s not found", key.c_str());
-    }
-
-    return it->second.c_str();
-}
-
-const char *ConfigImpl::getString(const std::string &key,
-                                  const std::string &def) const {
-    Iterator it = kv.find(key.c_str());
-
-    if (kv.end() == it) {
-        return def.c_str();
-    } else {
-        return it->second.c_str();
-    }
-}
-
-int64_t ConfigImpl::getInt64(const std::string &key) const {
-    int64_t retval;
-    Iterator it = kv.find(key.c_str());
-
-    if (kv.end() == it) {
-        THROW(HdfsConfigNotFound, "ConfigImpl key: %s not found", key.c_str());
-    }
-
-    try {
-        retval = StrToInt64(it->second.c_str());
-    } catch (const HdfsBadNumFoumat &e) {
-        NESTED_THROW(HdfsConfigNotFound, "ConfigImpl key: %s not found",
-                     key.c_str());
-    }
-
-    return retval;
-}
-
-int64_t ConfigImpl::getInt64(const std::string &key, int64_t def) const {
-    int64_t retval;
-    Iterator it = kv.find(key.c_str());
-
-    if (kv.end() == it) {
-        return def;
-    }
-
-    try {
-        retval = StrToInt64(it->second.c_str());
-    } catch (const HdfsBadNumFoumat &e) {
-        NESTED_THROW(HdfsConfigNotFound, "ConfigImpl key: %s not found",
-                     key.c_str());
-    }
-
-    return retval;
-}
-
-int32_t ConfigImpl::getInt32(const std::string &key) const {
-    int32_t retval;
-    Iterator it = kv.find(key.c_str());
-
-    if (kv.end() == it) {
-        THROW(HdfsConfigNotFound, "ConfigImpl key: %s not found", key.c_str());
-    }
-
-    try {
-        retval = StrToInt32(it->second.c_str());
-    } catch (const HdfsBadNumFoumat &e) {
-        NESTED_THROW(HdfsConfigNotFound, "ConfigImpl key: %s not found",
-                     key.c_str());
-    }
-
-    return retval;
-}
-
-int32_t ConfigImpl::getInt32(const std::string &key, int32_t def) const {
-    int32_t retval;
-    Iterator it = kv.find(key.c_str());
-
-    if (kv.end() == it) {
-        return def;
-    }
-
-    try {
-        retval = StrToInt32(it->second.c_str());
-    } catch (const HdfsBadNumFoumat &e) {
-        NESTED_THROW(HdfsConfigNotFound, "ConfigImpl key: %s not found",
-                     key.c_str());
-    }
-
-    return retval;
-}
-
-double ConfigImpl::getDouble(const std::string &key) const {
-    double retval;
-    Iterator it = kv.find(key.c_str());
-
-    if (kv.end() == it) {
-        THROW(HdfsConfigNotFound, "ConfigImpl key: %s not found", key.c_str());
-    }
-
-    try {
-        retval = StrToDouble(it->second.c_str());
-    } catch (const HdfsBadNumFoumat &e) {
-        NESTED_THROW(HdfsConfigNotFound, "ConfigImpl key: %s not found",
-                     key.c_str());
-    }
-
-    return retval;
-}
-
-double ConfigImpl::getDouble(const std::string &key, double def) const {
-    double retval;
-    Iterator it = kv.find(key.c_str());
-
-    if (kv.end() == it) {
-        return def;
-    }
-
-    try {
-        retval = StrToDouble(it->second.c_str());
-    } catch (const HdfsBadNumFoumat &e) {
-        NESTED_THROW(HdfsConfigNotFound, "ConfigImpl key: %s not found",
-                     key.c_str());
-    }
-
-    return retval;
-}
-
-bool ConfigImpl::getBool(const std::string &key) const {
-    bool retval;
-    Iterator it = kv.find(key.c_str());
-
-    if (kv.end() == it) {
-        THROW(HdfsConfigNotFound, "ConfigImpl key: %s not found", key.c_str());
-    }
-
-    try {
-        retval = StrToBool(it->second.c_str());
-    } catch (const HdfsBadBoolFoumat &e) {
-        NESTED_THROW(HdfsConfigNotFound, "ConfigImpl key: %s not found",
-                     key.c_str());
-    }
-
-    return retval;
-}
-
-bool ConfigImpl::getBool(const std::string &key, bool def) const {
-    bool retval;
-    Iterator it = kv.find(key.c_str());
-
-    if (kv.end() == it) {
-        return def;
-    }
-
-    try {
-        retval = StrToBool(it->second.c_str());
-    } catch (const HdfsBadNumFoumat &e) {
-        NESTED_THROW(HdfsConfigNotFound, "ConfigImpl key: %s not found",
-                     key.c_str());
-    }
-
-    return retval;
-}
-
-size_t ConfigImpl::hash_value() const {
-    vector<size_t> values;
-    map<string, string>::const_iterator s, e;
-    e = kv.end();
-
-    for (s = kv.begin(); s != e; ++s) {
-        values.push_back(StringHasher(s->first));
-        values.push_back(StringHasher(s->second));
-    }
-
-    return CombineHasher(&values[0], values.size());
-}
-}
-}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/ConfigImpl.h
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/ConfigImpl.h b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/ConfigImpl.h
deleted file mode 100644
index 5d058dd..0000000
--- a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/ConfigImpl.h
+++ /dev/null
@@ -1,165 +0,0 @@
-/**
- * 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.
- */
-
-#ifndef _HDFS_LIBHDFS3_COMMON_XMLCONFIGIMPL_H_
-#define _HDFS_LIBHDFS3_COMMON_XMLCONFIGIMPL_H_
-
-#include <stdint.h>
-#include <string>
-#include <sstream>
-#include <map>
-
-namespace hdfs {
-namespace internal {
-
-/**
- * A configure file parser.
- */
-class ConfigImpl {
-public:
-    ConfigImpl() {
-    }
-
-    /**
-     * Construct a empty Config instance.
-     */
-    ConfigImpl(const std::map<std::string, std::string> &kv);
-
-    /**
-     * Operator equal
-     */
-    bool operator==(const ConfigImpl &other) const {
-        if (this == &other) {
-            return true;
-        }
-
-        return this->kv == other.kv;
-    }
-
-    /**
-     * Get a string with given configure key.
-     * @param key The key of the configure item.
-     * @return The value of configure item.
-     * @throw HdfsConfigNotFound
-     */
-    const char *getString(const std::string &key) const;
-
-    /**
-     * Get a string with given configure key.
-     * Return the default value def if key is not found.
-     * @param key The key of the configure item.
-     * @param def The defalut value.
-     * @return The value of configure item.
-     */
-    const char *getString(const std::string &key, const std::string &def) const;
-
-    /**
-     * Get a 64 bit integer with given configure key.
-     * @param key The key of the configure item.
-     * @return The value of configure item.
-     * @throw HdfsConfigNotFound
-     */
-    int64_t getInt64(const std::string &key) const;
-
-    /**
-     * Get a 64 bit integer with given configure key.
-     * Return the default value def if key is not found.
-     * @param key The key of the configure item.
-     * @param def The defalut value.
-     * @return The value of configure item.
-     */
-    int64_t getInt64(const std::string &key, int64_t def) const;
-
-    /**
-     * Get a 32 bit integer with given configure key.
-     * @param key The key of the configure item.
-     * @return The value of configure item.
-     * @throw HdfsConfigNotFound
-     */
-    int32_t getInt32(const std::string &key) const;
-
-    /**
-     * Get a 32 bit integer with given configure key.
-     * Return the default value def if key is not found.
-     * @param key The key of the configure item.
-     * @param def The defalut value.
-     * @return The value of configure item.
-     */
-    int32_t getInt32(const std::string &key, int32_t def) const;
-
-    /**
-     * Get a double with given configure key.
-     * @param key The key of the configure item.
-     * @return The value of configure item.
-     * @throw HdfsConfigNotFound
-     */
-    double getDouble(const std::string &key) const;
-
-    /**
-     * Get a double with given configure key.
-     * Return the default value def if key is not found.
-     * @param key The key of the configure item.
-     * @param def The defalut value.
-     * @return The value of configure item.
-     */
-    double getDouble(const std::string &key, double def) const;
-
-    /**
-     * Get a boolean with given configure key.
-     * @param key The key of the configure item.
-     * @return The value of configure item.
-     * @throw HdfsConfigNotFound
-     */
-    bool getBool(const std::string &key) const;
-
-    /**
-     * Get a boolean with given configure key.
-     * Return the default value def if key is not found.
-     * @param key The key of the configure item.
-     * @param def The default value.
-     * @return The value of configure item.
-     */
-    bool getBool(const std::string &key, bool def) const;
-
-    /**
-     * Set a configure item
-     * @param key The key will set.
-     * @param value The value will be set to.
-     */
-    template <typename T>
-    void set(const std::string &key, T const &value) {
-        std::stringstream ss;
-        ss << value;
-        kv[key] = ss.str();
-    }
-
-    /**
-     * Get the hash value of this object
-     *
-     * @return The hash value
-     */
-    size_t hash_value() const;
-
-private:
-    std::string path;
-    std::map<std::string, std::string> kv;
-};
-}
-}
-
-#endif /* _HDFS_LIBHDFS3_COMMON_XMLCONFIGIMPL_H_ */

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/SessionConfig.cc
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/SessionConfig.cc b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/SessionConfig.cc
index cd46288..d64a3ab 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/SessionConfig.cc
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/SessionConfig.cc
@@ -18,14 +18,17 @@
 
 #include "SessionConfig.h"
 
-#include <sstream>
-
+#include "Config.h"
 #include "Exception.h"
 #include "ExceptionInternal.h"
 #include "Function.h"
 
+#include <sstream>
+
 #define ARRAYSIZE(A) (sizeof(A) / sizeof(A[0]))
 
+using hdfs::Config;
+
 namespace hdfs {
 namespace internal {
 
@@ -48,7 +51,7 @@ static void CheckMultipleOf(const char *key, const T &value, int unit) {
     }
 }
 
-SessionConfig::SessionConfig(const ConfigImpl &conf) {
+SessionConfig::SessionConfig(const Config &conf) {
     ConfigDefault<bool> boolValues[] = {
         {&rpcTcpNoDelay, "rpc.client.connect.tcpnodelay", true},
         {&readFromLocal, "dfs.client.read.shortcircuit", true},
@@ -104,8 +107,11 @@ SessionConfig::SessionConfig(const ConfigImpl &conf) {
         {&logSeverity, "dfs.client.log.severity", "INFO"}};
 
     for (size_t i = 0; i < ARRAYSIZE(boolValues); ++i) {
-        *boolValues[i].variable =
-            conf.getBool(boolValues[i].key, boolValues[i].value);
+        Status status = conf.getBool(boolValues[i].key,
+                              boolValues[i].value, boolValues[i].variable);
+        if (status.isError()) {
+            THROW(HdfsConfigInvalid, "%s", status.getErrorMsg());
+        }
 
         if (boolValues[i].check) {
             boolValues[i].check(boolValues[i].key, *boolValues[i].variable);
@@ -113,8 +119,11 @@ SessionConfig::SessionConfig(const ConfigImpl &conf) {
     }
 
     for (size_t i = 0; i < ARRAYSIZE(i32Values); ++i) {
-        *i32Values[i].variable =
-            conf.getInt32(i32Values[i].key, i32Values[i].value);
+        Status status = conf.getInt32(i32Values[i].key,
+                              i32Values[i].value, i32Values[i].variable);
+        if (status.isError()) {
+            THROW(HdfsConfigInvalid, "%s", status.getErrorMsg());
+        }
 
         if (i32Values[i].check) {
             i32Values[i].check(i32Values[i].key, *i32Values[i].variable);
@@ -122,8 +131,11 @@ SessionConfig::SessionConfig(const ConfigImpl &conf) {
     }
 
     for (size_t i = 0; i < ARRAYSIZE(i64Values); ++i) {
-        *i64Values[i].variable =
-            conf.getInt64(i64Values[i].key, i64Values[i].value);
+        Status status = conf.getInt64(i64Values[i].key,
+                              i64Values[i].value, i64Values[i].variable);
+        if (status.isError()) {
+            THROW(HdfsConfigInvalid, "%s", status.getErrorMsg());
+        }
 
         if (i64Values[i].check) {
             i64Values[i].check(i64Values[i].key, *i64Values[i].variable);
@@ -131,8 +143,12 @@ SessionConfig::SessionConfig(const ConfigImpl &conf) {
     }
 
     for (size_t i = 0; i < ARRAYSIZE(strValues); ++i) {
-        *strValues[i].variable =
-            conf.getString(strValues[i].key, strValues[i].value.c_str());
+        Status status = conf.getString(strValues[i].key,
+                              strValues[i].value.c_str(),
+                              strValues[i].variable);
+        if (status.isError()) {
+            THROW(HdfsConfigInvalid, "%s", status.getErrorMsg());
+        }
 
         if (strValues[i].check) {
             strValues[i].check(strValues[i].key, *strValues[i].variable);

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/SessionConfig.h
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/SessionConfig.h b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/SessionConfig.h
index 242d899..0302f9f 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/SessionConfig.h
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/SessionConfig.h
@@ -19,7 +19,6 @@
 #ifndef _HDFS_LIBHDFS3_COMMON_SESSIONCONFIG_H_
 #define _HDFS_LIBHDFS3_COMMON_SESSIONCONFIG_H_
 
-#include "ConfigImpl.h"
 #include "Exception.h"
 #include "ExceptionInternal.h"
 #include "Function.h"
@@ -27,7 +26,10 @@
 
 #include <cassert>
 #include <stdint.h>
-#include <vector>
+
+namespace hdfs {
+class Config;
+}
 
 namespace hdfs {
 namespace internal {
@@ -43,7 +45,7 @@ struct ConfigDefault {
 
 class SessionConfig {
 public:
-    SessionConfig(const ConfigImpl &conf);
+    explicit SessionConfig(const hdfs::Config &conf);
 
     /*
      * rpc configure

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Status.h
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Status.h b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Status.h
index fc7a9b2..32dff20 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Status.h
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/Status.h
@@ -57,4 +57,12 @@ private:
 };
 }
 
+#define RETURN_NOT_OK(expr) \
+    do { \
+        Status s = expr; \
+        if (s.isError()) { \
+            return s; \
+        } \
+    } while (0);
+
 #endif /* _HDFS_LIBHDFS3_COMMON_STATUS_H_ */

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/StringUtil.h
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/StringUtil.h b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/StringUtil.h
index 33dabd9..1080fc2 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/StringUtil.h
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/StringUtil.h
@@ -24,6 +24,14 @@
 #include <vector>
 #include <cctype>
 
+const char *const HDFS_XML_NAMES[] = {
+    "core-default.xml",
+    "core-site.xml",
+    "hdfs-default.xml",
+    "hdfs-site.xml",
+    NULL
+};
+
 namespace hdfs {
 namespace internal {
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/XmlConfigParser.cc
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/XmlConfigParser.cc b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/XmlConfigParser.cc
index 8088fe7..3dd6ef1 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/XmlConfigParser.cc
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/XmlConfigParser.cc
@@ -16,139 +16,317 @@
  * limitations under the License.
  */
 
+#include "Atoi.h"
+#include "Config.h"
 #include "Exception.h"
 #include "ExceptionInternal.h"
+#include "Logger.h"
+#include "SharedPtr.h"
+#include "StatusInternal.h"
+#include "StringUtil.h"
 #include "XmlConfigParser.h"
 
 #include <cassert>
 #include <errno.h>
+#include <expat.h>
 #include <fstream>
-#include <libxml/parser.h>
-#include <libxml/tree.h>
 #include <limits>
+#include <map>
 #include <string.h>
 #include <unistd.h>
 #include <vector>
 
 using namespace hdfs::internal;
-
-using std::map;
 using std::string;
 using std::vector;
 
 namespace hdfs {
 namespace internal {
 
-typedef map<string, string>::const_iterator Iterator;
-typedef map<string, string> Map;
+enum XmlParseState {
+    HCXML_PARSE_INIT = 0,
+    HCXML_PARSE_IN_CONFIG,
+    HCXML_PARSE_IN_PROPERTY,
+    HCXML_PARSE_IN_NAME,
+    HCXML_PARSE_IN_VALUE,
+    HCXML_PARSE_IN_FINAL,
+};
+
+// TODO: deprecation table
+
+struct Value {
+    Value() : final_(false) {
+    }
+
+    Value(const std::string &text, bool f)
+        : text_(text), final_(f) { }
+    std::string text_;
+    bool final_;
+};
+
+typedef std::map<std::string, Value> accum_map_t;
 
-static void readXmlConfigParserItem(xmlNodePtr root, Map &kv,
-                                    const char *path) {
-    std::string key, value;
-    xmlNodePtr curNode;
-    bool hasname = false, hasvalue = false;
+class XmlData {
+public:
+    XmlData(const std::string &path, XML_Parser parser) 
+            : path_(path),
+              parser_(parser),
+              state_(HCXML_PARSE_INIT),
+              ignoredParents_(0),
+              final_(false) {
+        XML_SetUserData(parser_, this);
+        XML_SetElementHandler(parser_, XmlData::startElement, XmlData::endElement);
+        XML_SetCharacterDataHandler(parser_, handleData);
+    }
+
+    ~XmlData() {
+        XML_ParserFree(parser_);
+    }
 
-    for (curNode = root; NULL != curNode; curNode = curNode->next) {
-        if (curNode->type != XML_ELEMENT_NODE) {
-            continue;
+    void populateConf(hdfs::Config *conf) {
+        for (accum_map_t::iterator i = accumMap_.begin();
+                 i != accumMap_.end(); ++i) {
+            conf->set(i->first, i->second.text_);
         }
+    }
+
+private:
+    XmlData(const XmlData&);
+    XmlData &operator=(const XmlData &);
 
-        if (!hasname && !strcmp((const char *)curNode->name, "name")) {
-            if (NULL != curNode->children &&
-                XML_TEXT_NODE == curNode->children->type) {
-                key = (const char *)curNode->children->content;
-                hasname = true;
+    static void startElement(void *data, const char *element,
+                const char **attribute) {
+        XmlData *ctx = reinterpret_cast<XmlData*>(data);
+        if (ctx->ignoredParents_ > 0) {
+            ctx->ignoredParents_++;
+            return;
+        }
+        switch (ctx->state_) {
+        case HCXML_PARSE_INIT:
+            if (!strcmp(element, "configuration")) {
+                ctx->state_ = HCXML_PARSE_IN_CONFIG;
+                return;
             }
-        } else if (!hasvalue && !strcmp((const char *)curNode->name, "value")) {
-            if (NULL != curNode->children &&
-                XML_TEXT_NODE == curNode->children->type) {
-                value = (const char *)curNode->children->content;
-                hasvalue = true;
+            break;
+        case HCXML_PARSE_IN_CONFIG:
+            if (!strcmp(element, "property")) {
+                ctx->state_ = HCXML_PARSE_IN_PROPERTY;
+                return;
             }
-        } else {
-            continue;
+            break;
+        case HCXML_PARSE_IN_PROPERTY:
+            if (!strcmp(element, "name")) {
+                ctx->state_ = HCXML_PARSE_IN_NAME;
+                return;
+            } else if (!strcmp(element, "value")) {
+                ctx->state_ = HCXML_PARSE_IN_VALUE;
+                return;
+            } else if (!strcmp(element, "final")) {
+                ctx->state_ = HCXML_PARSE_IN_FINAL;
+                return;
+            }
+            break;
+        default:
+            break;
         }
+        LOG(LOG_ERROR, "XmlData(%s): ignoring "
+                "element '%s'\n", ctx->path_.c_str(), element);
+        ctx->ignoredParents_++;
     }
 
-    if (hasname && hasvalue) {
-        kv[key] = value;
-        return;
-    } else if (hasname) {
-        kv[key] = "";
-        return;
-    }
+    static void endElement(void *data, const char *el) {
+        XmlData *ctx = reinterpret_cast<XmlData*>(data);
 
-    THROW(HdfsBadConfigFoumat,
-          "XmlConfigParser cannot parse XmlConfigParserure file: \"%s\"", path);
-}
+        if (ctx->ignoredParents_ > 0) {
+            ctx->ignoredParents_--;
+            return;
+        }
+        switch (ctx->state_) {
+        case HCXML_PARSE_IN_CONFIG:
+            ctx->state_ = HCXML_PARSE_INIT;
+            break;
+        case HCXML_PARSE_IN_PROPERTY:
+            ctx->state_ = HCXML_PARSE_IN_CONFIG;
+            if (ctx->name_.empty()) {
+                LOG(LOG_ERROR, "hconf_builder_load_xml(%s): property "
+                    "tag is missing <name> on line %lld\n",
+                    ctx->path_.c_str(),
+                    (long long)XML_GetCurrentLineNumber(ctx->parser_));
+            } else if (ctx->value_.empty()) {
+                LOG(LOG_ERROR, "hconf_builder_load_xml(%s): property "
+                    "tag is missing <value> on line %lld\n",
+                    ctx->path_.c_str(),
+                    (long long)XML_GetCurrentLineNumber(ctx->parser_));
+            } else {
+                accum_map_t::iterator i = ctx->accumMap_.find(ctx->name_);
+                if ((i != ctx->accumMap_.end()) && (i->second.final_)) {
+                    LOG(LOG_ERROR, "XmlData(%s): ignoring attempt to "
+                        "re-set final key '%s'\n", ctx->path_.c_str(),
+                        i->second.text_.c_str());
+                    break;
+                }
+                ctx->accumMap_[ctx->name_] = Value(ctx->name_, ctx->final_);
+            }
+            ctx->name_.clear();
+            ctx->value_.clear();
+            ctx->final_ = false;
+            break;
+        case HCXML_PARSE_IN_NAME:
+            ctx->state_ = HCXML_PARSE_IN_PROPERTY;
+            break;
+        case HCXML_PARSE_IN_VALUE:
+            ctx->state_ = HCXML_PARSE_IN_PROPERTY;
+            break;
+        case HCXML_PARSE_IN_FINAL:
+            ctx->state_ = HCXML_PARSE_IN_PROPERTY;
+            break;
+        default:
+            break;
+        }
+    }
 
-static void readXmlConfigParserItems(xmlDocPtr doc, Map &kv, const char *path) {
-    xmlNodePtr root, curNode;
-    root = xmlDocGetRootElement(doc);
+    static void handleData(void *data, const char *content, int length) {
+        XmlData *ctx = reinterpret_cast<XmlData*>(data);
 
-    if (NULL == root ||
-        strcmp((const char *)root->name, "XmlConfigParseruration")) {
-        THROW(HdfsBadConfigFoumat,
-              "XmlConfigParser cannot parse XmlConfigParserure file: \"%s\"",
-              path);
+        switch (ctx->state_) {
+        case HCXML_PARSE_IN_NAME: {
+            if (ctx->name_.empty()) {
+                ctx->name_ = string(content, length);
+            } else {
+                    LOG(LOG_ERROR, "XmlData(%s): duplicate "
+                        "<name> tag on line %lld\n", ctx->path_.c_str(),
+                        (long long)XML_GetCurrentLineNumber(ctx->parser_));
+                }
+                break;
+        }
+        case HCXML_PARSE_IN_VALUE: {
+            if (ctx->value_.empty()) {
+                ctx->value_ = string(content, length);
+            } else {
+                LOG(LOG_ERROR, "XmlData(%s): duplicate "
+                    "<value> tag on line %lld\n", ctx->path_.c_str(),
+                    (long long)XML_GetCurrentLineNumber(ctx->parser_));
+            }
+            break;
+        }
+        case HCXML_PARSE_IN_FINAL: {
+            string boolStr(content, length);
+            bool val;
+            Status status = StrToBool(boolStr.c_str(), &val);
+            if (status.isError()) {
+                LOG(LOG_ERROR, "XmlData(%s): error parsing "
+                    "<final> tag on line %lld\n", ctx->path_.c_str(),
+                    (long long)XML_GetCurrentLineNumber(ctx->parser_));
+            } else {
+                ctx->final_ = val;
+            }
+            break;
+        }
+        default:
+            break;
+        }
     }
 
-    /*
-     * for each property
-     */
-    for (curNode = root->children; NULL != curNode; curNode = curNode->next) {
-        if (curNode->type != XML_ELEMENT_NODE) {
-            continue;
-        }
+    /** Path of the current XML file we're parsing. */
+    std::string path_;
 
-        if (strcmp((const char *)curNode->name, "property")) {
-            THROW(
-                HdfsBadConfigFoumat,
-                "XmlConfigParser cannot parse XmlConfigParserure file: \"%s\"",
-                path);
-        }
+    /** The XML parser we're using. */
+    XML_Parser parser_;
 
-        readXmlConfigParserItem(curNode->children, kv, path);
-    }
-}
+    /** XML parse state. */
+    XmlParseState state_;
+
+    /** The number of parent elements we are ignoring. */
+    int ignoredParents_;
+
+    /** Nonzero if the current property is final. */
+    bool final_;
+
+    /** Malloced key, if we saw one. */
+    string name_;
+
+    /** Malloced value, if we saw one. */
+    string value_;
+
+    /** The keys and values we've seen. */
+    accum_map_t accumMap_;
+};
+
+static const char *const HDFS_XML_NAMES[] = {
+    "core-default.xml",
+    "core-site.xml",
+    "hdfs-default.xml",
+    "hdfs-site.xml",
+    NULL
+};
 
-XmlConfigParser::XmlConfigParser(const char *p) : path(p) {
-    update(p);
+XmlConfigParser::XmlConfigParser(hdfs::Config *conf)
+    : conf_(conf) {
 }
 
-void XmlConfigParser::update(const char *p) {
-    char msg[64];
-    xmlDocPtr doc; /* the resulting document tree */
-    LIBXML_TEST_VERSION
-    kv.clear();
-    path = p;
-
-    if (access(path.c_str(), R_OK)) {
-        strerror_r(errno, msg, sizeof(msg));
-        THROW(HdfsBadConfigFoumat,
-              "Cannot read XmlConfigParserure file: \"%s\", %s", path.c_str(),
-              msg);
+Status XmlConfigParser::ParseXmls(const std::string &pathList) {
+    string errors, prefix;
+    vector<string> paths = StringSplit(pathList, ":");
+    for (vector<string>::const_iterator p = paths.begin();
+             p != paths.end(); ++p) {
+        for (size_t x = 0; HDFS_XML_NAMES[x]; ++x) {
+            Status status = ParseXml(*p + "/" + HDFS_XML_NAMES[x]);
+            if (status.getCode() != ENOENT) {
+                errors = errors + prefix + status.getErrorMsg();
+                prefix = ", ";
+            }
+        }
+    }
+    if (errors.empty()) {
+        return Status::OK();
     }
+    return Status(EINVAL, errors);
+}
 
-    /* parse the file */
-    doc = xmlReadFile(path.c_str(), NULL, 0);
-
-    try {
-        /* check if parsing succeeded */
-        if (doc == NULL) {
-            THROW(
-                HdfsBadConfigFoumat,
-                "XmlConfigParser cannot parse XmlConfigParserure file: \"%s\"",
-                path.c_str());
-        } else {
-            readXmlConfigParserItems(doc, kv, path.c_str());
-            /* free up the resulting document */
-            xmlFreeDoc(doc);
+Status XmlConfigParser::ParseXml(const std::string &path) {
+    ::FILE *fp = ::fopen(path.c_str(), "r");
+    if (!fp) {
+        int err = errno;
+        if (err == ENOENT) {
+            return Status(ENOENT, "No such file as " + path);
         }
-    } catch (...) {
-        xmlFreeDoc(doc);
-        throw;
+        return Status(err);
+    }
+    shared_ptr<FILE> fpPtr(fp, ::fclose);
+    XML_Parser parser = XML_ParserCreate("UTF-8");
+    if (!parser) {
+        return Status(ENOMEM, "Failed to create libexpat XML parser for " +
+                      path);
     }
+    XmlData xmlData(path, parser);
+
+    vector<uint8_t> buf(16384, 0x0);
+    int res = 0;
+    do {
+        res = fread(&buf[0], 1, buf.size(), fp);
+        if (res <= 0) {
+            if (feof(fp)) {
+                res = 0;
+            } else {
+                int e = errno;
+                return Status(e, "Failed to read from configuration XML "
+                              "file " + path);
+            }
+        }
+        int pstatus = XML_Parse(parser,
+                reinterpret_cast<const char *>(&buf[0]), res,
+                res ? XML_FALSE : XML_TRUE);
+        if (pstatus != XML_STATUS_OK) {
+            enum XML_Error error = XML_GetErrorCode(parser);
+            return Status(EINVAL, "hconf_builder_load_xml(" + path + "): " +
+                            "parse error: " + XML_ErrorString(error));
+        }
+    } while (res);
+    xmlData.populateConf(conf_);
+    return Status::OK();
 }
+
 }
 }
+
+// vim: ts=4:sw=4:tw=79:et

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/XmlConfigParser.h
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/XmlConfigParser.h b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/XmlConfigParser.h
index 1d17c8d..1dba433 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/XmlConfigParser.h
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/common/XmlConfigParser.h
@@ -19,10 +19,13 @@
 #ifndef _HDFS_LIBHDFS3_COMMON_XMLCONFIGPARSER_H_
 #define _HDFS_LIBHDFS3_COMMON_XMLCONFIGPARSER_H_
 
-#include <stdint.h>
+#include "StatusInternal.h"
+
 #include <string>
-#include <sstream>
-#include <map>
+
+namespace hdfs {
+class Config;
+}
 
 namespace hdfs {
 namespace internal {
@@ -32,37 +35,32 @@ namespace internal {
  */
 class XmlConfigParser {
 public:
-    /**
-     * Construct a empty Config instance.
-     */
-    XmlConfigParser() {
-    }
+    XmlConfigParser(hdfs::Config *conf);
 
     /**
-     * Construct a Config with given configure file.
-     * @param path The path of configure file.
-     * @throw HdfsBadConfigFoumat
+     * Parse a colon-separated list of paths for HDFS configuration files.
+     * The format is the same as that of CLASSPATH.
+     *
+     * Even when an error is returned, we may still load some entries into the
+     * Config file.
      */
-    XmlConfigParser(const char *path);
+    Status ParseXmls(const std::string &pathList);
 
     /**
-     * Parse the configure file.
-     * @throw HdfsBadConfigFoumat
+     * Parse a single XML file.
+     *
+     * Even when an error is returned, we may still load some entries into the
+     * Config file.
      */
-    void update(const char *path);
-
-    /**
-     * Get Key Values
-     * @return Return the Key Value pairs.
-     */
-    std::map<std::string, std::string> getKeyValue() {
-        return kv;
-    }
+    Status ParseXml(const std::string &path);
 
 private:
-    std::string path;
-    std::map<std::string, std::string> kv;
+    XmlConfigParser(const XmlConfigParser &);
+    XmlConfigParser &operator=(const XmlConfigParser &);
+
+    hdfs::Config *conf_;
 };
+
 }
 }
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/411c31fa/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/server/NamenodeInfo.cc
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/server/NamenodeInfo.cc b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/server/NamenodeInfo.cc
index 9706d6d..118731a 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/server/NamenodeInfo.cc
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/server/NamenodeInfo.cc
@@ -17,7 +17,6 @@
  */
 
 #include "Config.h"
-#include "ConfigImpl.h"
 #include "NamenodeInfo.h"
 #include "StatusInternal.h"
 #include "StringUtil.h"
@@ -26,6 +25,7 @@
 #include <vector>
 
 using namespace hdfs::internal;
+using std::string;
 
 namespace hdfs {
 
@@ -38,28 +38,32 @@ const char *const DFS_NAMENODE_RPC_ADDRESS_KEY = "dfs.namenode.rpc-address";
 const char *const DFS_NAMENODE_HTTP_ADDRESS_KEY = "dfs.namenode.http-address";
 
 Status NamenodeInfo::GetHANamenodeInfo(const std::string &service,
-                                       const Config &c,
+                                       const Config &conf,
                                        std::vector<NamenodeInfo> *output) {
-    ConfigImpl &conf = *c.impl;
     CHECK_PARAMETER(NULL != output, EINVAL, "invalid parameter \"output\"");
 
     try {
+        std::string strNameNodes;
         std::vector<NamenodeInfo> &retval = *output;
-        std::string strNameNodes = StringTrim(
-            conf.getString(std::string(DFS_NAMENODE_HA) + "." + service));
+        RETURN_NOT_OK(conf.getString(
+                std::string(DFS_NAMENODE_HA) + "." + service, &strNameNodes));
         std::vector<std::string> nns = StringSplit(strNameNodes, ",");
         retval.resize(nns.size());
 
         for (size_t i = 0; i < nns.size(); ++i) {
-            std::string dfsRpcAddress =
+            std::string dfsRpcAddressKey =
                 StringTrim(std::string(DFS_NAMENODE_RPC_ADDRESS_KEY) + "." +
                            service + "." + StringTrim(nns[i]));
-            std::string dfsHttpAddress =
+            string rpcAddress;
+            RETURN_NOT_OK(conf.getString(dfsRpcAddressKey, "", &rpcAddress));
+            retval[i].setRpcAddr(StringTrim(rpcAddress));
+
+            std::string dfsHttpAddressKey =
                 StringTrim(std::string(DFS_NAMENODE_HTTP_ADDRESS_KEY) + "." +
                            service + "." + StringTrim(nns[i]));
-            retval[i].setRpcAddr(StringTrim(conf.getString(dfsRpcAddress, "")));
-            retval[i].setHttpAddr(
-                StringTrim(conf.getString(dfsHttpAddress, "")));
+            string httpAddress;
+            RETURN_NOT_OK(conf.getString(dfsHttpAddressKey, "", &httpAddress));
+            retval[i].setHttpAddr(StringTrim(httpAddress));
         }
 
     } catch (...) {


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