Getting ERROR when running GP commands while using gpupgrade

Products

• VMware Tanzu Greenplum

Issue/Introduction

While upgrading your system from 5x to 6x, or when running a 5x and 6x on the same system, you may encounter the following error when trying to run GP commands, such as gpstop, gpstart, etc

stderr='Error: unable to import module: /usr/local/greenplum-db-6.20.4/lib/libpq.so.5: symbol gss_acquire_cred_from, version gssapi_krb5_2_MIT not defined in file libgssapi_krb5.so.2 with link time reference

Environment

Product Version: 6.21

Resolution

This occurs when the source and target Greenplum environments are mixed, causing utilities to fail. To resolve this, perform the following steps:

1. On all segments, remove from .bashrc or .bash_profile files any lines that source greenplum_path.sh or set Greenplum variables.

2. Start a new shell and ensure that PATH, LD_LIBRARY_PATH, PYTHONHOME, and PYTHONPATH are clear of any Greenplum values. Use the unset command if these values are still pointing to Greenplum variables. 

3. ssh to a segment host and also ensure the above values are clear of any Greenplum values.