Deferring communication with project for "w" days, "x" hours, "y" minutes, and "z" seconds

From Unofficial BOINC Wiki

Contents 1 General 2 Version Information 2.1 Alternate Message Formats 3 Example Log(s) 3.1 No Schedulers Responded 3.1.1 Line-By-Line Explanation 4 Other Related Messages

[edit] General

Message Type: Information Message

This message means that when the BOINC Client Software made an attempt to contact a Scheduling Server (Scheduler) and it was not successful; it will use an operation called an Exponential Back-Off. In geek-speak, it means that to avoid flooding the servers with requests it will make each additional contact with an increasing amount of delay.

What happens is that if the Project goes off-line for some period of time, this will generate "pent-up" demand as the various computers belonging to the Participants want to return Results and get new Work Units. The problem is that with the outage more computers attempt to contact the server at the same time. With thousands of computers attempting to connect the server will become overloaded. By increasing the delay after each unsuccessful attempt, this causes the requests to "spread out" over time.

With the requests "spread out", eventually we get back to the situation where the Servers can keep up with the demand.

[edit] Version Information

[edit] Alternate Message Formats

• Deferring communication with project for "z" seconds
• Deferring communication with project for "y" minutes and "z" seconds
• Deferring communication with project for "x" hours, "y" minutes, and "z" seconds
• Deferring communication with project for "w" days, "x" hours, "y" minutes, and "z" seconds
• Deferring communication with project for "v" weeks, "w" days, "x" hours, "y" minutes, and "z" seconds

[edit] Example Log(s)

[edit] No Schedulers Responded

(1) 2005-06-04 00:53:13 [SETI@home] Requesting 21829.03 seconds of work
(2) 2005-06-04 00:53:13 [SETI@home] Sending scheduler request to
                                    http://setiboinc.ssl.berkeley.edu/sah_cgi/cgi
(3) 2005-06-04 00:54:28 [SETI@home] Scheduler request to
                                    http://setiboinc.ssl.berkeley.edu/sah_cgi/cgi failed
(4) 2005-06-04 00:54:28 [SETI@home] No schedulers responded
(5) 2005-06-04 00:54:28 [SETI@home] Deferring communication with project for 30 minutes and 10 seconds

Line-By-Line Explanation

1. Requesting "x" seconds of work

   This is just a message telling you how much work you need to get to satisfy the size you have selected for your Work Buffer. This number is always expressed in seconds.

2. Sending request to scheduler: '(url)'

   This message indicates that the BOINC Client Software is making the attempt to connect to the Project's Scheduling Server.

3. Scheduler request to '(url)' failed

   This message indicates that the communications session to the Project's Scheduling Server did not succeed.

4. No schedulers responded

   This message indicates the reason why the communications session with the Project's Scheduling Server did not succeed.

5. Deferring communication with project for "x" hours, "y" minutes, and "z" seconds

   This message indicates that we will use Exponential Back-Off to calculate a time interval to wait before attempting to make another try to contact the Project's Scheduling Server.

[edit] Other Related Messages

• Scheduler request to '(url)' failed
• Scheduler request to '(url)' succeeded
• Scheduler RPC to '(url)' failed (Obsolete/Changed in Version 4.3x)
• Scheduler RPC to '(url)' succeeded (Obsolete/Changed in Version 4.3x)