Add fatal LoggingThread error backout strategy #253
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lzaoral
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In release-engineering#169, fatal LoggingThread errors were logged to the worker's local log file before exiting. In release-engineering#248, a more drastic measure was taken: all exceptions were indefinitely retried and the ability to write exceptions to the worker's local log file was removed. This approach could prevent the LoggingThread from terminating when encountering a fatal error. This commit combines the two approaches, backing out and exiting only after determining we've identified a persistent fatal error. The means by which we identify a fatal (vs a temporary/non-fatal) LoggingThread error is by simply retrying the `upload_task_log` method during a defined interval (defined by the LoggingThread's `_timeout` attribute). If the method continues to fail for the duration of the interval (i.e., does not succeed by the time the timeout is reached), we can consider the error to be fatal. At this point, we attempt to instead write the error to the worker's local log file, and raise the exception. Note that the timeout can be toggled using the `KOBO_LOGGING_THREAD_TIMEOUT` environment variable.
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In #169, fatal LoggingThread errors were logged to the worker's local log file before exiting.
In #248, a more drastic measure was taken: all exceptions were indefinitely retried and the ability to write exceptions to the worker's local log file was removed. This approach could prevent the LoggingThread from terminating when encountering a fatal error.
This commit combines the two approaches, backing out and exiting only after determining we've identified a persistent fatal error.
The means by which we identify a fatal (vs a temporary/non-fatal) LoggingThread error is by simply retrying the
upload_task_logmethod during a defined interval (defined by the LoggingThread's_timeoutattribute).If the method continues to fail for the duration of the interval (i.e., does not succeed by the time the timeout is reached), we can consider the error to be fatal. At this point, we attempt to instead write the error to the worker's local log file, and raise the exception.
Note that the timeout can be toggled using the
KOBO_LOGGING_THREAD_TIMEOUTenvironment variable.