[jboss-jira] [JBoss JIRA] (JGRP-1743) NAKACK*: log a warning if xmit_table gets large
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https://issues.jboss.org/browse/JGRP-1743?page=com.atlassian.jira.plugin....
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Bela Ban commented on JGRP-1743:
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This is problematic: what is huge and when should this check be done?
* Is it the number of messages in the NAKACK table ?
* Is it the entire size occupied by the NAKACK table ? In the latter case, I'd have to
iterate through all messages and get their length. This is already provided via
{{NAKACK2.getSizeOfAllMessages()}}.
* When should this be done ? Periodically ? Note that the above method is exposed as a JMX
operation, so it could be queried from a script, e.g. {{probe.sh
op=NAKACK2.getSizeOfAllMessages}}
NAKACK*: log a warning if xmit_table gets large
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Key: JGRP-1743
URL: https://issues.jboss.org/browse/JGRP-1743
Project: JGroups
Issue Type: Feature Request
Affects Versions: 3.4.1
Reporter: Dennis Reed
Assignee: Bela Ban
Priority: Minor
Fix For: 3.5
There have been some cases where NAKACK* accumulates large number of messages, causing
OutOfMemoryErrors.
Large numbers of messages in NAKACK* would almost always indicate a problem, which the
user should be aware of.
Logging a warning if the number of messages in NAKACK passes a configurable threshold
would let the user investigate and take action sooner before a catastrophic
OutOfMemoryError, or other issues occur.
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