Mounting DBFS using dbfs_client Hangs " FO - Unregister callback" (Doc ID 1606070.1)

Last updated on JANUARY 24, 2020

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.3 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

While configuring DBFS on the client machine, the following command hangs:

   $ $ORACLE_HOME/bin/dbfs_client dbfs_owner@EAI01D -o failover /appl/home/oracle/dbfs_bla
   @ Password:
   ... hangs forever ...

This client machine is trying to mount the DBFS from a database on a different machine.

The required fuse is present

   $ rpm -qa | grep -i fuse
   fuse-devel-2.8.3-4.el6.x86_64
   fuse-2.8.3-4.el6.x86_64
   fuse-libs-2.8.3-4.el6.x86_64

When you take the trace of the command

$ $ORACLE_HOME/bin/dbfs_client dbfs_owner@EAI01D -o failover -otrace_file=/tmp/dbfs.out -otrace_level=1 -otrace_size=0 /appl/home/oracle/dbfs_bla
@ Password:

You see the following in the trace file:

   [28fa5700 10/09/13 11:55:54.921796 LcdfFso.cpp:165            ] DEBUG: FSO   DecRefcnt(/) ref:1
   [28fa5700 10/09/13 11:55:54.921807 LcdfLock.cpp:230           ] DEBUG: Global Lock - unlock
   [28fa5700 10/09/13 11:55:54.921822 LcdfLock.cpp:242           ] DEBUG: Global Lock (R) rdwr:0
   [28fa5700 10/09/13 11:55:54.921839 LcdfDBPool.cpp:348         ] DEBUG: releaseSession FOCTX delete 0x7f98080008f0
   [28fa5700 10/09/13 11:55:54.921861 LcdfDBPool.cpp:646         ] DEBUG: FO - Unregister callback...
   [1b3f1700 10/09/13 11:55:55.077967 ./LcdfThreadPool.h:276     ] DEBUG: Retrying after some time .110. 1381312555 79439539
   [1a9f0700 10/09/13 11:55:55.078062 ./LcdfThreadPool.h:276     ] DEBUG: Retrying after some time .110. 1381312555 79549954
   [1a9f0700 10/09/13 11:56:00.078384 ./LcdfThreadPool.h:276     ] DEBUG: Retrying after some time .110. 1381312560 79970050

Cause

	To view full details, sign in with your My Oracle Support account.
	Don't have a My Oracle Support account? Click to get started!

In this Document

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.

Mounting DBFS using dbfs_client Hangs " FO - Unregister callback" (Doc ID 1606070.1)

Applies to:

Symptoms

Cause

To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!