Logstash Scheduling first run - elasticsearch

Question

I have a logstash pipeline running every 5 minutes with below jdbc input config, issue is upon starting the pipeline first time, it also waits for 5 minutes and then start scheduling. Is there any way to specify that we query/statement is executed as soon as the logstash pipeline is started instead of waiting on first 5 minutes too?
input {
jdbc {
jdbc_driver_class => "com.mysql.jdbc.Driver"
jdbc_connection_string => "jdbc:mysql://${DB_HOST}/${DB_NAME}?useSSL=false"
jdbc_user => "${DB_USER_NAME}"
jdbc_password => "${DB_PASSWORD}"
schedule => "*/5 * * * *"
statement => "Select * from students"
}
}

Answer 1

The other workaround to this is to have two jdbc inputs, one for startup and one for schedule. It requires a bit of copy/paste but is not too bad.
input {
jdbc {
id => "index_name_startup"
jdbc_connection_string => "${JDBC_STRING}"
jdbc_user => "${JDBC_USER}"
jdbc_password => "${JDBC_PASSWORD}"
jdbc_driver_library => "/opt/logstash/postgresql-42.2.5.jre7.jar"
jdbc_driver_class => "org.postgresql.Driver"
add_field => { "[#metadata][project_id]" => "index_name" }
statement_filepath => "/mnt/elastic-search-config/sql-scripts/assets-index_name.sql"
}
jdbc {
id => "index_name"
jdbc_connection_string => "${JDBC_STRING}"
jdbc_user => "${JDBC_USER}"
jdbc_password => "${JDBC_PASSWORD}"
jdbc_driver_library => "/opt/logstash/postgresql-42.2.5.jre7.jar"
jdbc_driver_class => "org.postgresql.Driver"
add_field => { "[#metadata][project_id]" => "index_name" }
statement_filepath => "/mnt/elastic-search-config/sql-scripts/assets-index_name.sql"
schedule => "0 * * * *"
}
}
filter {
mutate {
gsub => [
"name", "_", " ",
"name", "-", " "
]
}
}
output {
if [#metadata][project_id] == "index_name" {
elasticsearch {
index => "index_name"
document_id => "%{geom_id}"
hosts => "localhost:9200"
template_name => "assets_template"
id => "index_name_es"
}
}
}

Answer 2

No, that is not the way rufus cron schedules work (and that is what the jdbc input uses). There is an open issue that includes a link to a patch that adds this.