Andy Kurth created VCL-924:
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Summary: Commands may hang on management node if it has an
unavailable NFS share
Key: VCL-924
URL: https://issues.apache.org/jira/browse/VCL-924
Project: VCL
Issue Type: Bug
Components: vcld (backend)
Affects Versions: 2.4.2
Reporter: Andy Kurth
Assignee: Andy Kurth
Fix For: 2.5
We came across a situation on one of our management nodes related to this:
https://bugzilla.redhat.com/show_bug.cgi?id=962755
The management node had an old NFS share mounted from a storage unit which was
removed from service. Attempts to unmount the share were not successful.
Under fairly rare circumstances, a vcld process will call lsof on the
management node in order to determine which other vcld process is preventing it
from obtaining a semaphore. This vcld process hung indefinitely due to the
unavailable NFS share and the issue described in the link above.
There is currently no timeout mechanism built into the code which executes
commands locally on the management node. It would be beneficial to add one and
specify a timeout on commands which may hang such as lsof.
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