重启数据服务

decide_restart_or_failover() 调用 restart_service() 函数，以尝试在同一节点上重新启动数据服务。 该函数执行以下逻辑：

• 确定数据服务是否仍在 PMF 之下注册。如果服务仍处于注册状态，函数将执行以下操作：

  • 为数据服务获取 Stop 方法名称和 Stop_timeout 值

  • 使用 hatimerun 为数据服务启动 Stop 方法，传递 Stop_timeout 值

  • 如果数据服务成功停止，则为数据服务获取 Start 方法名称和 Start_timeout 值

  • 使用 hatimerun 为数据服务启动 Start 方法，传递 Start_timeout 值

• 如果数据服务已不在 PMF 之下注册，则表示数据服务已超过了 PMF 下允许的最大重试次数。系统将使用 GIVEOVER 选项调用 scha_control() 函数，以将数据服务故障转移到其他节点。

function restart_service
{

        # To restart the data service, first verify that the 
        # data service itself is still registered under PMF.
        pmfadm -q $PMF_TAG
        if [[ $? -eq 0 ]]; then
                # Since the TAG for the data service is still registered under
                # PMF, first stop the data service and start it back up again.

                # Obtain the Stop method name and the STOP_TIMEOUT value for
                # this resource.
                STOP_TIMEOUT=`scha_resource_get -O STOP_TIMEOUT \
                        -R $RESOURCE_NAME -G $RESOURCEGROUP_NAM?
                STOP_METHOD=`scha_resource_get -O STOP \
                        -R $RESOURCE_NAME -G $RESOURCEGROUP_NAM?
                hatimerun -t $STOP_TIMEOUT $RT_BASEDIR/$STOP_METHOD \
                        -R $RESOURCE_NAME -G $RESOURCEGROUP_NAME \
                        -T $RESOURCETYPE_NAME

                if [[ $? -ne 0 ]]; then
                        logger-p ${SYSLOG_FACILITY}.err -t [$SYSLOG_TAG] \
                                “${ARGV0} Stop method failed.”
                        return 1
                fi

                # Obtain the START method name and the START_TIMEOUT value for
                # this resource.
                START_TIMEOUT=`scha_resource_get -O START_TIMEOUT \
                        -R $RESOURCE_NAME -G $RESOURCEGROUP_NAM?
                START_METHOD=`scha_resource_get -O START \
                        -R $RESOURCE_NAME -G $RESOURCEGROUP_NAM?
                hatimerun -t $START_TIMEOUT $RT_BASEDIR/$START_METHOD \
                        -R $RESOURCE_NAME -G $RESOURCEGROUP_NAME \
                        -T $RESOURCETYPE_NAME

                if [[ $? -ne 0 ]]; then
                        logger-p ${SYSLOG_FACILITY}.err -t [$SYSLOG_TAG] \
                                “${ARGV0} Start method failed.”
                        return 1
                fi


        else
                # The absence of the TAG for the dataservice 
                # implies that the data service has already
                # exceeded the maximum retries allowed under PMF.
                # Therefore, do not attempt to restart the
                # data service again, but try to failover
                # to another node in the cluster.
                scha_control -O GIVEOVER -G $RESOURCEGROUP_NAME \
                        -R $RESOURCE_NAME
        fi

        return 0
}