docker/runtime/fe/resource/fe_check_master.sh

#!/bin/bash
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# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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check_first_fe_status()
{
    local start_time=`date +%s`
    local expire_timeout=120
    local helper=$1
    while true; do
        output=`timeout 15 mysql --connect-timeout 2 -h $helper -P $FE_QUERY_PORT -u root --skip-column-names --batch -e "SHOW FRONTENDS;"`
    if [[ "x$output" != "x" ]]; then
        return 0
    fi

    let "expire=start_time+expire_timeout"
    local now=`date +%s`
    if [[ $expire -le $now ]]; then
        echo "[`date`] the first container is not started" >& 2
        exit 1
    fi

    sleep 2
    done
}

check_first_fe_status $1