Jerry Cwiklik created UIMA-5537:
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Summary: UIMA-DUCC: agent GC collector not reporting GC stats
Key: UIMA-5537
URL: https://issues.apache.org/jira/browse/UIMA-5537
Project: UIMA
Issue Type: Bug
Components: DUCC
Reporter: Jerry Cwiklik
Assignee: Jerry Cwiklik
Fix For: 2.2.1-Ducc
Agent's child process GC collector not reporting stats sometimes. When agent
launches a child process it also starts a GC collector which probes the remote
MBeanServer for current garbage collector stats. The remote process sends an
update to the agent which includes process JMX port. This port is used by the
GC collector to connect to the remote. There is a race here: an agent can start
GC collector *before* it receives JMX port from the remote. The current code
establishes JMX connection in its constructor which is a bug. If it fails to
connect, it silently goes on and keeps reporting 0 for GC stats.
The fix is to improve logging to clearly identify what is happening. Since the
collector is called on a timer, it should always check its connection and try
to establish it if a previous attempt failed.
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