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From "Yan Fitterer (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ZOOKEEPER-2670) CLONE - Connections fo ZooKeeper server becomes slow over time with native GSSAPI
Date Thu, 19 Jan 2017 19:33:26 GMT
Yan Fitterer created ZOOKEEPER-2670:
---------------------------------------

             Summary: CLONE - Connections fo ZooKeeper server becomes slow over time with
native GSSAPI
                 Key: ZOOKEEPER-2670
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2670
             Project: ZooKeeper
          Issue Type: Bug
          Components: server
    Affects Versions: 3.4.6, 3.4.7, 3.4.8, 3.5.0
         Environment: OS: RHEL6
Java: 1.8.0_40
Configuration:

java.env:
{noformat}
SERVER_JVMFLAGS="$SERVER_JVMFLAGS -Xmx5120m"
SERVER_JVMFLAGS="$SERVER_JVMFLAGS -Djava.security.auth.login.config=/local/apps/zookeeper-test1/conf/jaas-server.conf"
SERVER_JVMFLAGS="$SERVER_JVMFLAGS -Dsun.security.jgss.native=true"
{noformat}

jaas-server.conf:
{noformat}
Server {
    com.sun.security.auth.module.Krb5LoginModule required
    useKeyTab=true
    isInitiator=false
    principal="zookeeper/<hostname>@<REALM>";
};
{noformat}

Process environment:
{noformat}
KRB5_KTNAME=/local/apps/zookeeper-test1/conf/keytab
ZOO_LOG_DIR=/local/apps/zookeeper-test1/log
ZOOCFGDIR=/local/apps/zookeeper-test1/conf
{noformat}
            Reporter: Yan Fitterer
            Assignee: Enis Soztutar
             Fix For: 3.4.6, 3.4.7, 3.4.8, 3.5.2


ZooKeeper server becomes slow over time when native GSSAPI is used. The connection to the
server starts taking upto 10 seconds.
This is happening with ZooKeeper-3.4.6 and is fairly reproducible.

Debug logs:
{noformat}
2015-07-02 00:58:49,318 [myid:] - INFO  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:NIOServerCnxnFactory@197]
- Accepted socket connection from /<client_ip>:47942
2015-07-02 00:58:49,318 [myid:] - DEBUG [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:ZooKeeperSaslServer@78]
- serviceHostname is '<zookeeper-server>'
2015-07-02 00:58:49,318 [myid:] - DEBUG [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:ZooKeeperSaslServer@79]
- servicePrincipalName is 'zookeeper'
2015-07-02 00:58:49,318 [myid:] - DEBUG [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:ZooKeeperSaslServer@80]
- SASL mechanism(mech) is 'GSSAPI'
2015-07-02 00:58:49,324 [myid:] - DEBUG [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:ZooKeeperSaslServer@106]
- Added private credential to subject: [GSSCredential: 
zookeeper@<zookeeper-server> 1.2.840.113554.1.2.2 Accept [class sun.security.jgss.wrapper.GSSCredElement]]
2015-07-02 00:58:59,441 [myid:] - DEBUG [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:ZooKeeperServer@810]
- Session establishment request from client /<client_ip>:47942 client's lastZxid is
0x0
2015-07-02 00:58:59,441 [myid:] - INFO  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:ZooKeeperServer@868]
- Client attempting to establish new session at /<client_ip>:47942
2015-07-02 00:58:59,448 [myid:] - DEBUG [SyncThread:0:FinalRequestProcessor@88] - Processing
request:: sessionid:0x14e486028785c81 type:createSession cxid:0x0 zxid:0x110e79 txntype:-10
reqpath:n/a
2015-07-02 00:58:59,448 [myid:] - DEBUG [SyncThread:0:FinalRequestProcessor@160] - sessionid:0x14e486028785c81
type:createSession cxid:0x0 zxid:0x110e79 txntype:-10 reqpath:n/a
2015-07-02 00:58:59,448 [myid:] - INFO  [SyncThread:0:ZooKeeperServer@617] - Established session
0x14e486028785c81 with negotiated timeout 10000 for client /<client_ip>:47942
2015-07-02 00:58:59,452 [myid:] - DEBUG [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:ZooKeeperServer@949]
- Responding to client SASL token.
2015-07-02 00:58:59,452 [myid:] - DEBUG [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:ZooKeeperServer@953]
- Size of client SASL token: 706
2015-07-02 00:58:59,460 [myid:] - DEBUG [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:ZooKeeperServer@984]
- Size of server SASL response: 161
2015-07-02 00:58:59,462 [myid:] - DEBUG [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:ZooKeeperServer@949]
- Responding to client SASL token.
2015-07-02 00:58:59,462 [myid:] - DEBUG [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:ZooKeeperServer@953]
- Size of client SASL token: 0
2015-07-02 00:58:59,462 [myid:] - DEBUG [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:ZooKeeperServer@984]
- Size of server SASL response: 32
2015-07-02 00:58:59,463 [myid:] - DEBUG [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:ZooKeeperServer@949]
- Responding to client SASL token.
2015-07-02 00:58:59,463 [myid:] - DEBUG [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:ZooKeeperServer@953]
- Size of client SASL token: 32
2015-07-02 00:58:59,464 [myid:] - INFO  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:SaslServerCallbackHandler@118]
- Successfully authenticated client: authenticationID=<user_principal>;  authorizationID=<user_principal>.
2015-07-02 00:58:59,464 [myid:] - INFO  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:ZooKeeperServer@964]
- adding SASL authorization for authorizationID: <user_principal>
2015-07-02 00:58:59,465 [myid:] - INFO  [ProcessThread(sid:0 cport:-1)::PrepRequestProcessor@494]
- Processed session termination for sessionid: 0x14e486028785c81
2015-07-02 00:58:59,467 [myid:] - DEBUG [SyncThread:0:FinalRequestProcessor@88] - Processing
request:: sessionid:0x14e486028785c81 type:closeSession cxid:0x1 zxid:0x110e7a txntype:-11
reqpath:n/a
2015-07-02 00:58:59,467 [myid:] - DEBUG [SyncThread:0:FinalRequestProcessor@160] - sessionid:0x14e486028785c81
type:closeSession cxid:0x1 zxid:0x110e7a txntype:-11 reqpath:n/a
2015-07-02 00:58:59,467 [myid:] - INFO  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:42405:NIOServerCnxn@1007]
- Closed socket connection for client /<client_ip>:47942 which had sessionid 0x14e486028785c81
{noformat}

If you see, after adding the credentials to privateCredential set, it takes roughly 10 seconds
to reach to session establishment request. From the code it looks like Subject.doAs() is taking
a lot of time.

I connected it to jdb while it was waiting and got following stacktrace:
{noformat}
NIOServerCxn.Factory:0.0.0.0/0.0.0.0:58909:
  [1] java.util.HashMap$TreeNode.find (HashMap.java:1,865)
  [2] java.util.HashMap$TreeNode.find (HashMap.java:1,861)
  [3] java.util.HashMap$TreeNode.find (HashMap.java:1,861)
  [4] java.util.HashMap$TreeNode.find (HashMap.java:1,861)
  [5] java.util.HashMap$TreeNode.find (HashMap.java:1,861)
  [6] java.util.HashMap$TreeNode.find (HashMap.java:1,861)
  [7] java.util.HashMap$TreeNode.find (HashMap.java:1,861)
  [8] java.util.HashMap$TreeNode.putTreeVal (HashMap.java:1,981)
  [9] java.util.HashMap.putVal (HashMap.java:637)
  [10] java.util.HashMap.put (HashMap.java:611)
  [11] java.util.HashSet.add (HashSet.java:219)
  [12] javax.security.auth.Subject$ClassSet.populateSet (Subject.java:1,418)
  [13] javax.security.auth.Subject$ClassSet.<init> (Subject.java:1,372)
  [14] javax.security.auth.Subject.getPrivateCredentials (Subject.java:767)
  [15] sun.security.jgss.GSSUtil$1.run (GSSUtil.java:340)
  [16] sun.security.jgss.GSSUtil$1.run (GSSUtil.java:332)
  [17] java.security.AccessController.doPrivileged (native method)
  [18] sun.security.jgss.GSSUtil.searchSubject (GSSUtil.java:332)
  [19] sun.security.jgss.wrapper.NativeGSSFactory.getCredFromSubject (NativeGSSFactory.java:53)
  [20] sun.security.jgss.wrapper.NativeGSSFactory.getCredentialElement (NativeGSSFactory.java:116)
  [21] sun.security.jgss.GSSManagerImpl.getCredentialElement (GSSManagerImpl.java:193)
  [22] sun.security.jgss.GSSCredentialImpl.add (GSSCredentialImpl.java:427)
  [23] sun.security.jgss.GSSCredentialImpl.<init> (GSSCredentialImpl.java:62)
  [24] sun.security.jgss.GSSManagerImpl.createCredential (GSSManagerImpl.java:154)
  [25] com.sun.security.sasl.gsskerb.GssKrb5Server.<init> (GssKrb5Server.java:108)
  [26] com.sun.security.sasl.gsskerb.FactoryImpl.createSaslServer (FactoryImpl.java:85)
  [27] javax.security.sasl.Sasl.createSaslServer (Sasl.java:524)
  [28] org.apache.zookeeper.server.ZooKeeperSaslServer$1.run (ZooKeeperSaslServer.java:118)
  [29] org.apache.zookeeper.server.ZooKeeperSaslServer$1.run (ZooKeeperSaslServer.java:114)
  [30] java.security.AccessController.doPrivileged (native method)
  [31] javax.security.auth.Subject.doAs (Subject.java:422)
  [32] org.apache.zookeeper.server.ZooKeeperSaslServer.createSaslServer (ZooKeeperSaslServer.java:114)
  [33] org.apache.zookeeper.server.ZooKeeperSaslServer.<init> (ZooKeeperSaslServer.java:48)
  [34] org.apache.zookeeper.server.NIOServerCnxn.<init> (NIOServerCnxn.java:100)
  [35] org.apache.zookeeper.server.NIOServerCnxnFactory.createConnection (NIOServerCnxnFactory.java:161)
  [36] org.apache.zookeeper.server.NIOServerCnxnFactory.run (NIOServerCnxnFactory.java:202)
  [37] java.lang.Thread.run (Thread.java:745)
{noformat}

This doesn't happen when we use JGSS, I think because adding credential to privateCredential
set for every connection is causing Subject.doAS() to take much longer time.



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