我有以下查询:
mysql> select (select m.delay from messages m order by message_id desc limit 1) as Delay, s.min_delay, s.max_delay from statistics s order by s.date_hour desc limit 1;
+-------+-----------+-----------+
| Delay | min_delay | max_delay |
+-------+-----------+-----------+
| 10 | 7.00
我正在尝试将hbase设置停靠在devcloud实例上,但在尝试运行start-hbase.sh文件时遇到以下错误
/hbase-2.4.7/bin/hbase: line 794: /jdk1.8.0_281/bin/java: No such file or directory
/hbase-2.4.7/bin/hbase: line 794: /jdk1.8.0_281/bin/java: No such file or directory
我检查了一下,发现路径是可用的,所以我不确定为什么会出现这个错误。
下面是我的Dockerfile的内容:
FROM alpine:3.8
U
目前,我正在为安卓构建mVoIP服务。我选择了FreeSwitch作为SIP服务器,通过PC通信是没有问题的。然而,所有Android开源系统都会使语音延迟。以下是我们到目前为止面临的数据。
案例1- FreeSwitch + PC
FreeSwitch 1.2 Stable version
Linux CentOS 6.5
Xlite Softphone for PC Windows8
Voice delay - less than 50ms
案例2- FreeSwitch +安卓Sipdroid
FreeSwitch 1.2 Stable version
Linux CentOS 6.5
我正在尝试编译this NanoPi Neo指南中描述的test.c。然而,当我试图运行gcc命令进行编译时,我得到了这个错误信息... GNU ld (GNU Binutils for Ubuntu) 2.26.1
Supported emulations:
armelf_linux_eabi
armelfb_linux_eabi
/usr/lib/gcc/arm-linux-gnueabihf/5/../../../arm-linux-gnueabihf/crt1.o: In function `_start':
(.text+0x28): undefined r
我是一个新的气流,想运行一个循环的任务,但我面临的循环错误。
from airflow import DAG
from airflow.contrib.operators.ssh_operator import SSHOperator
from airflow.operators.dummy import DummyOperator
from airflow.operators.python_operator import PythonOperator
from airflow.contrib.hooks.ssh_hook import SSHHook
from datetime import
下面是我的脚本:
def tail(file, delay=0.5):
f = open(file, 'r')
f.seek(0, 2)
while True:
line = f.readline()
print 'line: ' + line
if not line:
time.sleep(delay)
else:
print 'line found!'
当我打开文件并向其中添加一些行时,此脚本不会提取