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From "Bharat Gera (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DIRSERVER-1369) Concurrent bind and unbind of objects puts ADS in an inconsistent (unusable) state.
Date Thu, 18 Jun 2009 17:00:07 GMT

    [ https://issues.apache.org/jira/browse/DIRSERVER-1369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12721342#action_12721342
] 

Bharat Gera commented on DIRSERVER-1369:
----------------------------------------

I will like to get input on the overall Apache DS stability for concurrent access. The issue
almost blocked us to release our product. We had made workarounds in the application. 

Is there information available on the usage of Apache DS like , 
          - Concurrent Access scenarios that is the fundamental operation to any database.
Ofcoure , there is no transactional support in ldap but I find it strange that a product in
v1.5 has such basic issues?
         - Overall stability of Apache in production deployment with less than 10,000 users
with multiple applications connecting?

We plan to release apache DS big time next year across multiple product integrations and the
stability of the product really concerns me. Any docs, links etc will help.  

> Concurrent bind and unbind of objects puts ADS in an inconsistent (unusable) state.
> -----------------------------------------------------------------------------------
>
>                 Key: DIRSERVER-1369
>                 URL: https://issues.apache.org/jira/browse/DIRSERVER-1369
>             Project: Directory ApacheDS
>          Issue Type: Bug
>    Affects Versions: 1.5.4
>         Environment: Windows-xp, JDK-1.5 
>            Reporter: Murali Krishna 
>            Priority: Blocker
>             Fix For: 1.5.5
>
>         Attachments: MultiThreadedTest.java, MultiThreadedTest.java, MultiThreadedTest.java
>
>   Original Estimate: 120h
>  Remaining Estimate: 120h
>
> This is with reference to a problem we faced when performing concurrent bind and unbind
of objects with ADS-1.5.4 release build.
> Please find the java program at the bottom.
> Steps to reproduce:
> 1. Install apache_1.5.4 zip version of it and not the installer and change port numbers
to 1389 and 1636 respectively.
> 2. Create a naming context ( JDBM partition) on the lines of dc=example,dc=com
> 3. Also create the entry dc=example,dc=com
> 4. Run the java program provided below.
> Actual Result:
> The console throws up numerous Naming Exceptions with message "[LDAP: error code 80 -
OTHER: failed for     Del request
>         Entry : '2.5.4.3=adsadminpref_thread-11,0.9.2342.19200300.100.1.25=example,0.9.2342.19200300.100.1.25=com'
> : null]; remaining name 'cn=tdsadminPref_Thread-11,dc=telelogic,dc=com' " for each thread
operating on a preference object.
> As a result, the server gets into an inconsistent state and unoperational.
> Expected Result: 
> The server should continuously bind and unbind the java hash table object.
> What could have caused this and how do we correct this.
> Are there any specific configurations to be made in the server.xml.
> I tried modifying some of the attributes like syncOnWrite, syncOnMillis, maxThreads,
cachesize and also rebind (instead of bind and unbind) in the java program , but in vain.
> This is very important for us and do help us in this regard.
> Java program:
> import java.util.Date;
> import java.util.HashMap;
> import java.util.Hashtable;
> import java.util.Map;
> import javax.naming.CommunicationException;
> import javax.naming.Context;
> import javax.naming.NameAlreadyBoundException;
> import javax.naming.NameNotFoundException;
> import javax.naming.NamingException;
> import javax.naming.ldap.InitialLdapContext;
> import javax.naming.ldap.LdapContext;
> import com.telelogic.tds.common.TDSConstants;
> import com.telelogic.tds.common.TDSProperties;
> import com.telelogic.tds.engine.ldap.jndi.TDSDirObjectConstants;
> public class MultiThreadedTest extends Thread {
>     @Override
>     public void run() {
>         try {
>             LdapContext _tdsContext = null, _cntx;
>             _tdsContext = getContext();
>             // Create the initial context             
>             Map<String, Object> hMap = new HashMap<String, Object>();
>             hMap.put("data", "dsfdfd");
>             // authenticate user
>             int delay = 1;
>             while (true) {
>                 try {
>                     System.out.println(" Ops started " + getName());
>                     _cntx = _tdsContext.newInstance(null);                   
>                     setUserPreferences(_cntx, "adsadminPref_" + getName(), hMap);
>                     System.out.println(new Date()
>                         + " Preferences SET "
>                         + getName()
>                         + " "
>                         + getId()
>                         + " SIZE-- "
>                         + ((hMap.get("data") != null) ? hMap.get("data")
>                             .toString().length() : 0));
>                     _cntx.close();
>                     System.out.println(" Ops conducted successfully "
>                         + getName());
>                 } catch (NamingException e) {
>                     System.out.println(new Date() + " NAMING EXCETPION"
>                         + getName() + " " + getId());
>                     e.printStackTrace();
>                 } catch (Exception ex) {
>                     System.out.println(new Date() + " NAMING EXCETPION"
>                         + getName() + " " + getId());
>                     ex.printStackTrace();
>                 }
>                 Thread.sleep(delay);
>             }
>         } catch (Throwable e) {
>             e.printStackTrace();
>         }
>     }
>     private static LdapContext getContext() {
>         Hashtable<String, String> env = new Hashtable<String, String>();
>         LdapContext context = null;
>         String adminName = "uid=admin,ou=system";
>         String adminPassword = "secret";
>         env.put(Context.INITIAL_CONTEXT_FACTORY,
>             "com.sun.jndi.ldap.LdapCtxFactory");
>         env.put(Context.SECURITY_AUTHENTICATION, "simple");
>         env.put(Context.SECURITY_PRINCIPAL, adminName);
>         env.put(Context.SECURITY_CREDENTIALS, adminPassword);
>         //env.put(Context.PROVIDER_URL, "ldap://10.255.0.40:389");
>         env.put(Context.PROVIDER_URL, "ldap://localhost:1389");
>         env.put(TDSConstants.JNDI_LDAP_CONNECTION_TIMEOUT, TDSProperties
>             .getProperty(TDSConstants.LDAP_CONNECTION_TIMEOUT, "2000"));
>         env.put("com.sun.jndi.ldap.connect.pool", TDSProperties.getProperty(
>             "com.sun.jndi.ldap.connect.pool", "true"));
>         try {
>             context = new InitialLdapContext(env, null);
>         } catch (NamingException ne) {
>             System.exit(1);
>         }
>         return context;
>     }
>     public static void setUserPreferences(LdapContext context, String userName,
>         Map<String, Object> attributes) throws NamingException {
>         LdapContext derivedContext = context;
>         String bindOp =
>             TDSDirObjectConstants.CN + TDSDirObjectConstants.EQUAL_SYNTAX
>                 + userName + "," + "dc=example,dc=com";
>         try {
>             try {
>                 // Step 1: Unbind the user preferences data
>                 derivedContext.unbind(bindOp);
>             } catch (CommunicationException ce) {
>                 System.out.println("Trying to re-connect to RDS");
>                 //Impl reconnect logic
>             } catch (NameNotFoundException nnf) {
>                 System.out.println("User: " + userName
>                     + " cannot be found in the Ldap server");
>             }
>             try {
>                 // Step 2: Bind the user preferences data
>                 derivedContext.bind(bindOp, attributes);
>             } catch (CommunicationException ce) {
>                 System.out.println("Trying to re-connect to RDS");
>             } catch (NameAlreadyBoundException nab) {
>                 System.out.println("User: " + userName
>                     + " already exists in the Ldap server");
>             }
>             //derivedContext.rebind(bindOp, attributes);
>         } catch (NamingException ne) {
>             System.out.println("Could not set user profile for user: "
>                 + userName);
>             throw ne;
>         }
>     }
>     /**
>      * @param args
>      */
>     public static void main(String[] args) {
>         Thread t1, t2 = null;
>         for (int i = 0; i < 15; ++i) {
>             t1 = new MultiThreadedTest();
>             t1.start();
>         }
>     }
> }

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