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Hello @sergiud, I hope you had a pleasant vacation. PTAL!

Thanks for the PR and apologies for the late reply.

I'm not sure I understand the change. The log output file is truncated unconditionally; no check against max_log_size is performed. Can you elaborate why this still fixes the issue?

Thanks for the PR and apologies for the late reply.

I'm not sure I understand the change. The log output file is truncated unconditionally; no check against max_log_size is performed. Can you elaborate why this still fixes the issue?

There are two cases:
If FLAGS_timestamp_in_logfile_name is true, then a new file with a timestamp is created.

Else, it's implied that we are writing to a single log file, and in this case, whenever we are attempting to create a new file, it's because:

1. The log file is created for the first time.
2. The log file is being recreated due to length overflow in file size in this part of implementation:
   

   glog/src/logging.cc

   Lines 1110 to 1117 in 6c5c692

   	if (file_length_ >> 20U >= MaxLogSize() || PidHasChanged()) {
   	file_ = nullptr;
   	file_length_ = bytes_since_flush_ = dropped_mem_length_ = 0;
   	rollover_attempt_ = kRolloverAttemptFrequency - 1;
   	}
   	// If there's no destination file, make one before outputting
   	if (file_ == nullptr) {

When file_ is null, the logger will attempt to create a new logging file. In both these scenarios, the file should be truncated to reset the file size, hence the O_TRUNC flag. Is my understanding correct so far?

I see, thanks. Could you please extend the comment to mention that the log is recreated in the else branch due to size overflow as per 2?

Hey @sergiud!
I’ve extended the comments as you suggested and added a new test method to validate these changes. In this test, I turned off the timestamp flag and constrained the log_size to 1MB. Then, I logged 2e4 lines. Although the total lines exceed the 1MB threshold, the test ensures that the file size remains within the 1MB limit.