Service Stability: Long lived objects eventually cause repeated stop-the-world gc.

[kcondon]

The recent instability in service today seems to mostly be due to continuous stop-the-world gc.

I know this because each time there was a failure I checked:
jstat gcutil and
jmap -heap

Increasing the heap size helped but it's still happening.

Suggestions are to look at the access log and run the memory profiler on the app, looking for large object hierarchies being created and not freed on the most common pages, such as the homepage.

[mercecrosas]

FYI - We're still having once in a while Service temporarily unavailable:

PROBLEM: HTTPS-dvn is CRITICAL on host dataverse.harvard.edu

Service: HTTPS-dvn
Host: dataverse.harvard.edu
Alias: Production installation of Dataverse at Harvard
Address: dataverse.harvard.edu
Host Group Hierarchy: Opsview > DVN > DVN_Production
State: CRITICAL
Date & Time: Sun Apr 19 04:54:14 EDT 2015

Additional Information:

HTTP CRITICAL: HTTP/1.1 503 Service Temporarily Unavailable - 582 bytes in 30.697 second response time

[pdurbin]

Adding the Content-Length header in 2c81bea 5 days ago seems to have helped with large file downloads but there is more complexity to figure out having to do with Transfer-Encoding: chunked header for large files.

[scolapasta]

Passing to QA.