I'm trying to script a daily incremental dump using the packager. Sometimes it completes, but most often it throws "PSQLException: An I/O error occurred while sending to the backend" caused by "java.net.SocketException: Socket closed". About the same time PostgreSQL logs "unexpected EOF on client connection" and tears down its session. I turned logging way up on both ends but saw nothing unusual on the DSpace side and only the unexpected EOF on the Pg side.
Digging through the Pg log, I see lots of these unexpected EOFs. Apparently the webapp is getting this too but takes it in stride. Commandline app.s seem to be less fortunate. I captured a packet trace while running my script and can see that the client is chugging along, making requests and getting responses, then suddenly the client sends a TCP FIN, ACK packet and that's the end of that. No Pg shutdown message was sent, so far as I can tell, and that's why Pg says "unexpected EOF". After fairly rapid exchanges there's a pause of about 0.8 seconds between the previous packet (client ACKing the server's last response) and the FIN. The Pg backend is v9.0.5. This DSpace instance is v1.7.2. OS is Gentoo Linux x86 with all current userspace updates and kernel 2.6.39. JRE is Oracle (Sun) 1.6.0_29-b11. Ideas for debugging this? -- Mark H. Wood, Lead System Programmer mw...@iupui.edu Asking whether markets are efficient is like asking whether people are smart.
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