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Posted to dev@curator.apache.org by "Pavan Kumar M S (JIRA)" <ji...@apache.org> on 2016/03/25 08:05:25 UTC
[jira] [Created] (CURATOR-312) Memory leak of NamespaceWatcher when
register TreeCacheListener to non-existing path
Pavan Kumar M S created CURATOR-312:
---------------------------------------
Summary: Memory leak of NamespaceWatcher when register TreeCacheListener to non-existing path
Key: CURATOR-312
URL: https://issues.apache.org/jira/browse/CURATOR-312
Project: Apache Curator
Issue Type: Bug
Components: Recipes
Affects Versions: 2.8.0
Environment: Suse Linux + JDK 1.8
Windows 7 + JDK 1.7
Reporter: Pavan Kumar M S
Fix For: awaiting-response
Hi,
As per the Curator API document its allowed to register the TreeCacheListener to the path which is not present in the broker, but when we try to register its found that object 'NamespaceWatcher' keep on increasing and leading to out of memory in very short time.
Following is the sample code which can be used to reproduce the issue.
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.CuratorFrameworkFactory.Builder;
import org.apache.curator.framework.recipes.cache.TreeCache;
import org.apache.curator.framework.recipes.cache.TreeCacheEvent;
import org.apache.curator.framework.recipes.cache.TreeCacheListener;
import org.apache.curator.retry.RetryNTimes;
public class TreeCacheProblem
{
private static final int RETRYTIMES = 3;
private static final int RETRYINTERVAL = 1000;
private static final int CONNECTION_TIME_OUT = 3000;
private static final int SESSION_TIME_OUT = 5000;
public static void main ( String [] args ) throws Exception
{
TreeCacheProblem treeCache = new TreeCacheProblem();
treeCache.init ( "10.18.104.149:2189" );
String zkPath = "/home/sample";
treeCache.addTreeCacheListener ( zkPath, new TreeCacheListener(){
public void childEvent ( CuratorFramework client, TreeCacheEvent event )
throws Exception
{
System.out.println (event);
}
});
System.in.read();
}
private CuratorFramework client;
private void init ( String zkURL )
{
Builder connect = CuratorFrameworkFactory.builder ().connectString ( zkURL );
this.client = connect.retryPolicy ( new RetryNTimes ( RETRYTIMES, RETRYINTERVAL ) )
.connectionTimeoutMs ( CONNECTION_TIME_OUT ).sessionTimeoutMs ( SESSION_TIME_OUT )
.build ();
this.client.start ();
}
public void addTreeCacheListener ( String zkPath, TreeCacheListener treeCacheListener ) throws Exception
{
org.apache.curator.framework.recipes.cache.TreeCache.Builder builder = TreeCache
.newBuilder ( client, zkPath );
builder.setCacheData ( true );
TreeCache treeCache = builder.build ();
treeCache.getListenable ().addListener ( treeCacheListener );
treeCache.start ();
}
}
With Regards,
Pavan
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