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Status Not under consideration
Workspace AIX
Created by Guest
Created on Jun 2, 2015

RELATED IDEAS

Oracle requires an Environment variable to use for 64bit programs (Java Specifically) to privately load memory segments

Product: AIX 6.1 and 7.1
Java v6 and v7
Oracle 12

PROBLEM: Client Ricoh is using Oracles new "hot patching" feature via distributed NFS. This process runs 64 bit Java programs in the NFS mountpoint for the hot patching. The execution of java commands within the NFS mountpoint loads shared libraries. When subsequent attempts to remove the directories which were used as temporary working space during the install are run, the "rm" fails, because file are renamed as .nfs###. This is due to the fact that the shared libraries are still loaded, per design.

EXAMPLE OF ERROR Encountered by Oracle hot patching -
rm: 0653-611 Directory t2pjdk_old/jre/lib/ppc64/j9vm is not empty.
rm: 0653-611 Directory t2pjdk_old/jre/lib/ppc64 is not empty.
rm: 0653-611 Directory t2pjdk_old/jre/lib is not empty.
rm: 0653-611 Directory t2pjdk_old/jre is not empty.
rm: 0653-611 Directory t2pjdk_old is not empty.

Files with the following naming convention are found in the directories -.nfs### .nfs### etc

The .nfsXXXX files for the deleted shared library cannot be removed from the client side.
The .nfsXXXX files can be deleted on the server side.

WORK AROUND:
Run "slibclean" prior to removing the files. This is problematic, because Oracle installation does not run as root. Oracle install cannot call slibclean prior to every "rm" command.

ORACLES ONLY CURRENT SOLUTION: Use sudo to run "slibclean" in a loop for the duration of the hot patching activity -
++++++++++++++++
script_torun_slibclean.sh:
#!/bin/bash

while true
do
sudo /usr/sbin/slibclean
sleep 5
done
++++++++++++++++

REQUESTED SOLUTION:
From either AIX, or JAVA, provide an Env variable similar to that available for 32 bit Java, that will allow the loading of the segments privately, preventing them being loaded as shared libraries.

Similar to the following avail for 32 bit-
If using MAXDATA -
$ export LDR_CNTRL=PRIVSEG_LOADS@MAXDATA=0xB0000000@DSA
.
If not -
$ export LDR_CNTRL=PRIVSEG_LOADS

Idea priority Urgent
  • Guest
    Reply
    |     Aug 18, 2016

    The workaround implemented by the customer was to run slibclean
    multiple times to force the shared library cache to be cleaned.
    In many cases, a single slibclean may be adequate, but because NFS
    introduces these .nfsXXX files that keeps references to the libraries
    active longer than when not using NFS, there is the need to run
    multiple slibclean.

    Also, Oracle may be able to tweat the permissions and ownership
    of their embedded Java installation shared library files that could
    force the libraries in the private area and not loaded as shared libraries.

  • Guest
    Reply
    |     Aug 4, 2016

    This is my understanding from your explanation. Please confirm the same.

    As per your explanation, after loading shared library you have renamed it. Renaming is allowed.
    Now you are trying to remove the directories, which are used as temporary working space,
    Then the expected behavior is that "rm" SHOULD FAIL. Removing the files with a original name, which are already renamed, is bound to fail.

    Am still not clear with the understanding of the above query so I have the following questions
    This renaming is only done for 64-bit?
    Is there any renaming for 32-bit ?
    What is the necessity for renaming?

  • Guest
    Reply
    |     Jun 3, 2015

    Creating a new RFE based on Community RFE #72138 in product IBM AIX.

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