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HDFS-5587. add debug information when NFS fails to start with duplicate user or group names. Contributed by Brandon Li 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1548028 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Brandon Li 2013-12-05 07:13:21 +00:00
parent 6d5f8ebed6
commit aa4fba6d92
3 changed files with 124 additions and 22 deletions
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87
hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/IdUserGroup.java
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@ -24,6 +24,7 @@ import java.io.InputStreamReader;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.BiMap;
import com.google.common.collect.HashBiMap;
@ -44,13 +45,21 @@ public class IdUserGroup {
// Do update every 15 minutes
final static long TIMEOUT = 15 * 60 * 1000; // ms
// Maps for id to name map. Guarded by this object monitor lock */
// Maps for id to name map. Guarded by this object monitor lock
private BiMap<Integer, String> uidNameMap = HashBiMap.create();
private BiMap<Integer, String> gidNameMap = HashBiMap.create();
private long lastUpdateTime = 0; // Last time maps were updated
public IdUserGroup() {
static public class DuplicateNameOrIdException extends IOException {
private static final long serialVersionUID = 1L;
public DuplicateNameOrIdException(String msg) {
super(msg);
}
}
public IdUserGroup() throws IOException {
updateMaps();
}
@ -58,18 +67,34 @@ public class IdUserGroup {
return lastUpdateTime - System.currentTimeMillis() > TIMEOUT;
}
// If can't update the maps, will keep using the old ones
private void checkAndUpdateMaps() {
if (isExpired()) {
LOG.info("Update cache now");
updateMaps();
try {
updateMaps();
} catch (IOException e) {
LOG.error("Can't update the maps. Will use the old ones,"
+ " which can potentially cause problem.", e);
}
}
}
private static final String DUPLICATE_NAME_ID_DEBUG_INFO = "NFS gateway can't start with duplicate name or id on the host system.\n"
+ "This is because HDFS (non-kerberos cluster) uses name as the only way to identify a user or group.\n"
+ "The host system with duplicated user/group name or id might work fine most of the time by itself.\n"
+ "However when NFS gateway talks to HDFS, HDFS accepts only user and group name.\n"
+ "Therefore, same name means the same user or same group. To find the duplicated names/ids, one can do:\n"
+ "<getent passwd | cut -d: -f1,3> and <getent group | cut -d: -f1,3> on Linux systms,\n"
+ "<dscl . -list /Users UniqueID> and <dscl . -list /Groups PrimaryGroupID> on MacOS.";
/**
* Get the whole list of users and groups and save them in the maps.
* @throws IOException
*/
private void updateMapInternal(BiMap<Integer, String> map, String name,
String command, String regex) throws IOException {
@VisibleForTesting
public static void updateMapInternal(BiMap<Integer, String> map, String mapName,
String command, String regex) throws IOException {
BufferedReader br = null;
try {
Process process = Runtime.getRuntime().exec(
@ -79,15 +104,31 @@ public class IdUserGroup {
while ((line = br.readLine()) != null) {
String[] nameId = line.split(regex);
if ((nameId == null) || (nameId.length != 2)) {
throw new IOException("Can't parse " + name + " list entry:" + line);
throw new IOException("Can't parse " + mapName + " list entry:" + line);
}
LOG.debug("add to " + mapName + "map:" + nameId[0] + " id:" + nameId[1]);
// HDFS can't differentiate duplicate names with simple authentication
Integer key = Integer.valueOf(nameId[1]);
String value = nameId[0];
if (map.containsKey(key)) {
LOG.error(String.format(
"Got duplicate id:(%d, %s), existing entry: (%d, %s).\n%s", key,
value, key, map.get(key), DUPLICATE_NAME_ID_DEBUG_INFO));
throw new DuplicateNameOrIdException("Got duplicate id.");
}
if (map.containsValue(nameId[0])) {
LOG.error(String.format(
"Got duplicate name:(%d, %s), existing entry: (%d, %s) \n%s",
key, value, map.inverse().get(value), value,
DUPLICATE_NAME_ID_DEBUG_INFO));
throw new DuplicateNameOrIdException("Got duplicate name");
}
LOG.debug("add " + name + ":" + nameId[0] + " id:" + nameId[1]);
map.put(Integer.valueOf(nameId[1]), nameId[0]);
}
LOG.info("Updated " + name + " map size:" + map.size());
LOG.info("Updated " + mapName + " map size:" + map.size());
} catch (IOException e) {
LOG.error("Can't update map " + name);
LOG.error("Can't update " + mapName + " map");
throw e;
} finally {
if (br != null) {
@ -101,24 +142,26 @@ public class IdUserGroup {
}
}
synchronized public void updateMaps() {
synchronized public void updateMaps() throws IOException {
BiMap<Integer, String> uMap = HashBiMap.create();
BiMap<Integer, String> gMap = HashBiMap.create();
try {
if (OS.startsWith("Linux")) {
updateMapInternal(uMap, "user", LINUX_GET_ALL_USERS_CMD, ":");
updateMapInternal(gMap, "group", LINUX_GET_ALL_GROUPS_CMD, ":");
} else if (OS.startsWith("Mac")) {
updateMapInternal(uMap, "user", MAC_GET_ALL_USERS_CMD, "\\s+");
updateMapInternal(gMap, "group", MAC_GET_ALL_GROUPS_CMD, "\\s+");
} else {
throw new IOException("Platform is not supported:" + OS);
}
} catch (IOException e) {
LOG.error("Can't update maps:" + e);
if (!OS.startsWith("Linux") && !OS.startsWith("Mac")) {
LOG.error("Platform is not supported:" + OS
+ ". Can't update user map and group map and"
+ " 'nobody' will be used for any user and group.");
return;
}
if (OS.startsWith("Linux")) {
updateMapInternal(uMap, "user", LINUX_GET_ALL_USERS_CMD, ":");
updateMapInternal(gMap, "group", LINUX_GET_ALL_GROUPS_CMD, ":");
} else {
// Mac
updateMapInternal(uMap, "user", MAC_GET_ALL_USERS_CMD, "\\s+");
updateMapInternal(gMap, "group", MAC_GET_ALL_GROUPS_CMD, "\\s+");
}
uidNameMap = uMap;
gidNameMap = gMap;
lastUpdateTime = System.currentTimeMillis();

56
hadoop-common-project/hadoop-nfs/src/test/java/org/apache/hadoop/nfs/nfs3/TestIdUserGroup.java Normal file
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@ -0,0 +1,56 @@
/**
* 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.nfs.nfs3;
import static org.junit.Assert.fail;
import java.io.IOException;
import org.apache.hadoop.nfs.nfs3.IdUserGroup.DuplicateNameOrIdException;
import org.junit.Test;
import com.google.common.collect.BiMap;
import com.google.common.collect.HashBiMap;
public class TestIdUserGroup {
@Test
public void testDuplicates() throws IOException {
String GET_ALL_USERS_CMD = "echo \"root:x:0:0:root:/root:/bin/bash\n"
+ "hdfs:x:11501:10787:Grid Distributed File System:/home/hdfs:/bin/bash\n"
+ "hdfs:x:11502:10788:Grid Distributed File System:/home/hdfs:/bin/bash\""
+ " | cut -d: -f1,3";
String GET_ALL_GROUPS_CMD = "echo \"hdfs:*:11501:hrt_hdfs\n"
+ "mapred:x:497\n" + "mapred2:x:497\"" + " | cut -d: -f1,3";
// Maps for id to name map
BiMap<Integer, String> uMap = HashBiMap.create();
BiMap<Integer, String> gMap = HashBiMap.create();
try {
IdUserGroup.updateMapInternal(uMap, "user", GET_ALL_USERS_CMD, ":");
fail("didn't detect the duplicate name");
} catch (DuplicateNameOrIdException e) {
}
try {
IdUserGroup.updateMapInternal(gMap, "group", GET_ALL_GROUPS_CMD, ":");
fail("didn't detect the duplicate id");
} catch (DuplicateNameOrIdException e) {
}
}
}

3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -777,6 +777,9 @@ Release 2.3.0 - UNRELEASED
HDFS-4997. libhdfs doesn't return correct error codes in most cases (cmccabe)
HDFS-5587. add debug information when NFS fails to start with duplicate user
or group names (brandonli)
Release 2.2.0 - 2013-10-13
INCOMPATIBLE CHANGES