Hi all,

We're currently developing simple ZooKeeper client to test its throughput
when ZK is used as persistent store in High Availability YARN (
https://issues.apache.org/jira/browse/YARN-128).

Here are some details about our configurations:

   - ZooKeeper client and library: version 3.4.5 stable release
   - ZK address: localhost:2184
   - Session timeout: 60 s
   - ACL Configuration: world:anyone:rwcda -> this will result in one entry
   in ACL list with "perms" value = 31, scheme="world", and id="anyone"
   - And here is our code to connect to ZooKeeper ensemble in my local
   machine

*        ZooKeeper zk = new ZooKeeper(_zkHostPort, _zkSessionTimeout, null);
*
*        zk.register(new ForwardingWatcher(zk));*
*        return zk;*
However, I always encounter this error:
*DEBUG [main-SendThread(localhost:2184)] (ZooKeeperSaslClient.java:519) -
Could not retrieve login configuration: java.lang.SecurityException: Unable
to locate a login configuration*
*Nov 27, 2012 8:12:38 PM zkndb.storage.ZKStorageImpl storeApplicationState*
*
*
And eventually this security exception is thrown:
*DEBUG [main-SendThread(localhost:2184)] (ZooKeeperSaslClient.java:519) -
Could not retrieve login configuration: java.lang.SecurityException: Unable
to locate a login configuration*
*
*
So in this case, what is the possible case of this error?
The complete output from our simple client is shown below:

 Output:
 INFO [main] (Environment.java:100) - Client
environment:zookeeper.version=3.4.5-1392090, built on 09/30/2012 17:52 GMT
 INFO [main] (Environment.java:100) - Client environment:host.name=arinto
 INFO [main] (Environment.java:100) - Client
environment:java.version=1.6.0_35
 INFO [main] (Environment.java:100) - Client environment:java.vendor=Sun
Microsystems Inc.
 INFO [main] (Environment.java:100) - Client
environment:java.home=/usr/java/jdk1.6.0_35/jre
 INFO [main] (Environment.java:100) - Client
environment:java.class.path=/usr/share/clusterj/clusterj-7.1.15a.jar:/usr/share/zookeeper/zookeeper-3.4.5.jar:/usr/share/guava/guava-13.0.1.jar:/usr/share/slf4j/slf4j-api-1.7.2.jar:/usr/share/slf4j/slf4j-log4j12-1.7.2.jar:/usr/share/log4j/log4j-1.2.17.jar:/home/arinto/gitproject/zkndb/build/classes
 INFO [main] (Environment.java:100) - Client
environment:java.library.path=/usr/java/jdk1.6.0_35/jre/lib/amd64/server:/usr/java/jdk1.6.0_35/jre/lib/amd64:/usr/java/jdk1.6.0_35/jre/../lib/amd64:/usr/java/jdk1.7.0_09/jre/lib/amd64:/usr/java/jdk1.7.0_09/jre/lib/i386::/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
 INFO [main] (Environment.java:100) - Client environment:java.io.tmpdir=/tmp
 INFO [main] (Environment.java:100) - Client environment:java.compiler=<NA>
 INFO [main] (Environment.java:100) - Client environment:os.name=Linux
 INFO [main] (Environment.java:100) - Client environment:os.arch=amd64
 INFO [main] (Environment.java:100) - Client
environment:os.version=3.2.0-33-generic
 INFO [main] (Environment.java:100) - Client environment:user.name=arinto
 INFO [main] (Environment.java:100) - Client
environment:user.home=/home/arinto
 INFO [main] (Environment.java:100) - Client
environment:user.dir=/home/arinto/gitproject/zkndb
 INFO [main] (ZooKeeper.java:438) - Initiating client connection,
connectString=localhost:2184 sessionTimeout=60000 watcher=null
DEBUG [main] (ClientCnxn.java:99) - zookeeper.disableAutoWatchReset is false
 INFO [main-SendThread(localhost:2184)] (ClientCnxn.java:966) - Opening
socket connection to server localhost/127.0.0.1:2184. Will not attempt to
authenticate using SASL (Unable to locate a login configuration)
 INFO [main-SendThread(localhost:2184)] (ClientCnxn.java:849) - Socket
connection established to localhost/127.0.0.1:2184, initiating session
DEBUG [main-SendThread(localhost:2184)] (ClientCnxn.java:889) - Session
establishment request sent on localhost/127.0.0.1:2184
DEBUG [main-SendThread(localhost:2184)] (ZooKeeperSaslClient.java:519) -
Could not retrieve login configuration: java.lang.SecurityException: Unable
to locate a login configuration
Nov 27, 2012 8:12:38 PM zkndb.storage.ZKStorageImpl storeApplicationState
INFO: Storing info for app: -7686504933654477676 at:
/ZKRMStateRoot/-7686504933654477676
 INFO [main-SendThread(localhost:2184)] (ClientCnxn.java:1207) - Session
establishment complete on server localhost/127.0.0.1:2184, sessionid 0x13b4342fd4a0002, negotiated timeout = 40000
DEBUG [main-SendThread(localhost:2184)] (ZooKeeperSaslClient.java:519) -
Could not retrieve login configuration: java.lang.SecurityException: Unable
to locate a login configuration
DEBUG [main-SendThread(localhost:2184)] (ZooKeeperSaslClient.java:519) -
Could not retrieve login configuration: java.lang.SecurityException: Unable
to locate a login configuration
DEBUG [main-SendThread(localhost:2184)] (ZooKeeperSaslClient.java:519) -
Could not retrieve login configuration: java.lang.SecurityException: Unable
to locate a login configuration
DEBUG [main-SendThread(localhost:2184)] (ZooKeeperSaslClient.java:519) -
Could not retrieve login configuration: java.lang.SecurityException: Unable
to locate a login configuration
DEBUG [main-SendThread(localhost:2184)] (ZooKeeperSaslClient.java:519) -
Could not retrieve login configuration: java.lang.SecurityException: Unable
to locate a login configuration
DEBUG [main-SendThread(localhost:2184)] (ZooKeeperSaslClient.java:519) -
Could not retrieve login configuration: java.lang.SecurityException: Unable
to locate a login configuration
DEBUG [main-SendThread(localhost:2184)] (ClientCnxn.java:815) - Reading
reply sessionid:0x13b4342fd4a0002, packet:: clientPath:null serverPath:null
finished:false header:: 1,1  replyHeader:: 1,429496729624,-101  request::
'/ZKRMStateRoot/-7686504933654477676,#ffffff9241ffffff9fffffffac6fffffffddffffffc2fffffff31effffffe19ffffff8117fffffff027ffffff9c7d8ffffffd6ffffffa2ffffffd5403ffffffd5ffffffbb13ffffffd2fffffffb3dffffff98ffffff97ffffff93fffffff5353afffffff64644ffffffb8efffffffcffffffea177b6affffff96ffffffd01059213