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From "Martin Zdila (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DIRAPI-52) Too many open files on some servers
Date Wed, 27 Jul 2011 11:39:10 GMT
Too many open files on some servers
-----------------------------------

                 Key: DIRAPI-52
                 URL: https://issues.apache.org/jira/browse/DIRAPI-52
             Project: Directory Client API
          Issue Type: Bug
    Affects Versions: 1.0.0-M5, 1.0.0-M4
         Environment: various, see description
            Reporter: Martin Zdila
            Priority: Critical


Testcase:

		final LdapConnectionConfig lcc = new LdapConnectionConfig();
		lcc.setLdapHost("ad.example.com");
		lcc.setUseSsl(true);
		lcc.setLdapPort(LdapConnectionConfig.DEFAULT_LDAPS_PORT);
		lcc.setTrustManagers(new NoVerificationTrustManager());

		for (int i = 0; i < 100; i++) {
			System.out.println(i);
			final LdapNetworkConnection connection = new LdapNetworkConnection(lcc);
			connection.bind();
			final EntryCursor cursor = connection.search("ou=something,dc=example.com", "(&(cn=comeCommonName)(objectClass=person)(sn=*)(givenName=*))",
SearchScope.SUBTREE, "cn");
			while (cursor.next()) {
				cursor.get();
			}
			connection.unBind();
			connection.close();
			Thread.sleep(1000);
		}

Running this on some servers causes many open files and they are growing on each iteration:
lsof -p <pid>:
...
java    18719 gofer   37u  0000        0,7        0      13 anon_inode
java    18719 gofer   38r  FIFO        0,6      0t0 9155974 pipe
java    18719 gofer   39w  FIFO        0,6      0t0 9155974 pipe
java    18719 gofer   40u  0000        0,7        0      13 anon_inode
java    18719 gofer   41r  FIFO        0,6      0t0 9155976 pipe
java    18719 gofer   42w  FIFO        0,6      0t0 9155976 pipe
java    18719 gofer   43u  0000        0,7        0      13 anon_inode
java    18719 gofer   44r  FIFO        0,6      0t0 9155977 pipe
java    18719 gofer   45w  FIFO        0,6      0t0 9155977 pipe
java    18719 gofer   46u  0000        0,7        0      13 anon_inode
java    18719 gofer   47r  FIFO        0,6      0t0 9155978 pipe
java    18719 gofer   48w  FIFO        0,6      0t0 9155978 pipe
java    18719 gofer   49u  0000        0,7        0      13 anon_inode
java    18719 gofer   50r  FIFO        0,6      0t0 9155980 pipe
java    18719 gofer   51w  FIFO        0,6      0t0 9155980 pipe
java    18719 gofer   52u  0000        0,7        0      13 anon_inode
java    18719 gofer   53r  FIFO        0,6      0t0 9155981 pipe
java    18719 gofer   54w  FIFO        0,6      0t0 9155981 pipe
java    18719 gofer   55u  0000        0,7        0      13 anon_inode
java    18719 gofer   56r  FIFO        0,6      0t0 9155982 pipe
java    18719 gofer   57w  FIFO        0,6      0t0 9155982 pipe
java    18719 gofer   58u  0000        0,7        0      13 anon_inode
java    18719 gofer   59r  FIFO        0,6      0t0 9155984 pipe
java    18719 gofer   60w  FIFO        0,6      0t0 9155984 pipe
java    18719 gofer   61u  0000        0,7        0      13 anon_inode
java    18719 gofer   62r  FIFO        0,6      0t0 9155985 pipe
java    18719 gofer   63w  FIFO        0,6      0t0 9155985 pipe
java    18719 gofer   64u  0000        0,7        0      13 anon_inode
java    18719 gofer   65r  FIFO        0,6      0t0 9155986 pipe
java    18719 gofer   66w  FIFO        0,6      0t0 9155986 pipe
... and many many more

This happens on:
Linux somedns1 2.6.26-2-xen-686 #1 SMP Thu Jan 27 05:44:37 UTC 2011 i686 GNU/Linux
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) Client VM (build 20.1-b02, mixed mode, sharing)

Also on another platform, but there are slightly less open pipes and anon_inodes:

Linux somedns2 2.6.26-2-686-bigmem #1 SMP Wed Nov 4 21:12:12 UTC 2009 i686 GNU/Linux
java version "1.6.0_12"
Java(TM) SE Runtime Environment (build 1.6.0_12-b04)
Java HotSpot(TM) Server VM (build 11.2-b01, mixed mode)

On my local computer I see only couple of open pipes and anon_inodes and they don't grow:
Linux bono 2.6.38-10-generic #46-Ubuntu SMP Tue Jun 28 15:07:17 UTC 2011 x86_64 x86_64 x86_64
GNU/Linux
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode)

I've found slightly similar isse here: http://issues.opennms.org/browse/NMS-4631
New file handlers are being opened by Apache Mina. I am not sure who is responsible for closing
it. In my testcase the connection is properly closed.

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