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|ID||Category||Severity||Reproducibility||Date Submitted||Last Update|
|0002368||[Resin]||crash||always||01-25-08 04:44||06-11-08 18:53|
|Summary||0002368: Whenever heapdump is taken, resin cluster breaks down|
Whenever we take a heapdump with command
jdk1.5.0_14/bin/jmap -heap:format=b PID
whole resin cluster (2-6 instances) becomes unresponsive and is unusable.
Quite often all resins in cluster needs to be restarted to make the site to serve again.
If Apaches with mod_caucho are restarted, the site works for some minutes, but breaks again.
Also amount of active threads increases hugely in each resin instance while taking the heapdump.
This is a difficult issue.
A heap dump freezes the JVM for the time that it takes to take the heap dump. If the heap is large, this can be a significant period of time.
For the cluster issue, we may need to change the messaging/threading behavior for writing backup copies. Currently, Resin uses the request thread to write the session backups, which can cause problem when a backup server goes down. Any updates to that backup model will need to wait for the 3.2.x branch (after 3.1.6)
|In 3.2, the sessions are now stored back using a separate thread, so even if a backend server is unresponsive, the primary servers will not need to wait.|
|01-25-08 04:44||resinossi||New Issue|
|03-27-08 10:17||ferg||Note Added: 0002924|
|06-11-08 18:53||ferg||Note Added: 0003177|
|06-11-08 18:53||ferg||Assigned To||=> ferg|
|06-11-08 18:53||ferg||Status||new => closed|
|06-11-08 18:53||ferg||Resolution||open => fixed|
|06-11-08 18:53||ferg||Fixed in Version||=> 3.2.0|
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