log file not roll over at restart.

Ema config guide says:

Scenario 2:
NumberOfLogFiles > 0; MaxLogFileSize=0
Filename #1 is created and roll over 1st file in case of restart.

So, I configuring logger like this:

<NumberOfLogFiles value="7" />
<MaxLogFileSize value="0" />

I expected that one log file will be created for each time the application (I using sample IProvider 100_MP_Streaming) start,

but actually, even though I start the application many times, contents appended to the first log file, so there is only one file.

Is my understanding wrong? How can I configure logger that creates log files for each time the application start?

Find more posts tagged with

logging

ema-api

interactive-provider

#technology

Accepted answers

Jirapongse

@kotaro_okada

Thank you for reaching out to us.

I tested it, and the behavior matches what’s described in the documentation.

NumberOfLogFiles > 0; MaxLogFileSize=0

Filename #1 is created and roll over 1st file in case of restart.

The file emaLog_1.log will be rolled over in case of restart.

To create new log files for each time the application start, you need to use:

NumberOfLogFiles=0; MaxLogFileSize=0

A file with unique pid name is created and grows indefinitely.

The file will have an associated PID (emaLog_<pid>.log).

Otherwise, you’ll need to implement logic to rename the emaLog_x.log files to different names when the application starts.

Jirapongse

@kotaro_okada

The NumberOfLogFiles configuration is used with the MaxLogFileSize configuration.

When file size reaches the value of "MaxLogFileSize" it is 

closed and a new file with the next sequential number is 

opened. See "NumberOfLogFiles".

It could be manually or programmatically.

For example, when the application starts, it could check if the emaLog_1.log file exists. If the file exists, the application can rename it to a different name.

All comments

Jirapongse

@kotaro_okada

Thank you for reaching out to us.

I tested it, and the behavior matches what’s described in the documentation.

NumberOfLogFiles > 0; MaxLogFileSize=0

Filename #1 is created and roll over 1st file in case of restart.

The file emaLog_1.log will be rolled over in case of restart.

To create new log files for each time the application start, you need to use:

NumberOfLogFiles=0; MaxLogFileSize=0

A file with unique pid name is created and grows indefinitely.

The file will have an associated PID (emaLog_<pid>.log).

Otherwise, you’ll need to implement logic to rename the emaLog_x.log files to different names when the application starts.

kotaro_okada

https://community.developers.refinitiv.com/discussion/comment/127675#Comment_127675

Thank you for your answer.

The file emaLog_1.log will be rolled over in case of restart.

I thought that old emaLog_1.log will be renamed to emaLog_2.log and new emaLog_1.log will be created automatically.

However, it's not true, and I have to rename old emaLog_1.log manually. Right?

Jirapongse

@kotaro_okada

The NumberOfLogFiles configuration is used with the MaxLogFileSize configuration.

When file size reaches the value of "MaxLogFileSize" it is 

closed and a new file with the next sequential number is 

opened. See "NumberOfLogFiles".

It could be manually or programmatically.

For example, when the application starts, it could check if the emaLog_1.log file exists. If the file exists, the application can rename it to a different name.

kotaro_okada

@Jirapongse

I understand, thank you!

EXPLORE OUR SITES