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

From Unofficial BOINC Wiki

Message Type: Information Message

When the BOINC Daemon attempts to contact a 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] Other Related Messages

• Backing off 'x' hours 'y' minutes and 'z' seconds on download of file '(file)'
• Backing off 'x' hours 'y' minutes and 'z' seconds on upload of file '(file)'
• Checksum or signature error for '(file)'
• Deferring communication with project for "x" hours, "y" and "z" seconds
• Finished download of '(file)'
• Finished upload of '(result)'
• Giving up on download of '(file)': file was not found on server
• Giving up on download of '(file)': Downloaded file had wrong size: expected "x", got "y" md5_file: can't open '(file)'
• Giving up on upload of '(file)': server rejected file
• Permanently failed download of '(file)'
• Permanently failed upload of '(file)'
• Started download of '(file)'
• Started upload of '(result)'
• Temporarily failed download of '(file)' Obsolete 4.3x
• Temporarily failed download of '(file)': '(error-code)' Obsolete 4.72
• Temporarily failed download of '(file)': '(error-text)'
• Temporarily failed upload of '(file)' Obsolete 4.3x
• Temporarily failed upload of '(file)': '(error-code)' Obsolete 4.72
• Temporarily failed upload of '(file)': '(error-text)'
• Throughput 'x' bytes/sec
• Unrecoverable error for result '(result)' (WU download error: couldn't get input files: '(file-list)': MD5 computation error)