3.9.1 Overview of monitoring requests remaining in a schedule queue

The schedule queue monitoring function monitors the number of requests in a schedule queue. If the number of queued requests exceeds a certain percentage, the CTM daemon outputs a message and terminates abnormally.

A schedule queue is monitored as follows:

1. The schedule queue monitoring function starts when the preset threshold percentage value of used capacity of the queue is exceeded.

2. When the function starts, it checks the filling status of the schedule queue at the specified time interval.

3. When the function performs a check, if the following expression is true, the CTM daemon terminates abnormally:

   Schedule queue monitoring expression:

   (P / C_{n - 1}) < (M1 / 100)

   P: Number of requests processed during the period from the previous check to the current time

   C_{n - 1}: Number of queued requests at the check before the last check (C_n)

   M1: Threshold for stopping the system (system processing percentage)

To use the schedule queue monitoring function, specify the -CTMWatchQueue option when executing the ctmstart command. For details about the ctmstart command, see ctmstart (start CTM daemon) in the uCosminexus Application Server Command Reference Guide.

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