epoch

Redis哨兵(Sentinel)模式快速入门

时光总嘲笑我的痴心妄想 提交于 2019-11-29 08:54:37
更多内容,欢迎关注微信公众号:全菜工程师小辉。公众号回复关键词,领取免费学习资料。 当主服务器宕机后,需要手动把一台从服务器切换为主服务器,这就需要人工干预,费事费力,还会造成一段时间内服务不可用。 所以更多时候,我们优先考虑哨兵(sentinel) 模式。 Redis sentinel是Redis高可用实现方案:故障发现、故障自动转移、配置中心、客户端通知。从Redis的2.6版本开始提供的,但是当时这个版本的模式是不稳定的,直到Redis的2.8版本以后,这个哨兵模式才稳定下来,在生产环境中,如果想要使用Redis的哨兵模式,也会尽量使用Redis的2.8版本之后的版本。 哨兵虽然有一个单独的可执行文件Redis-sentinel ,但实际上它只是一个运行在特殊模式下的 Redis服务器,你可以在启动一个普通Redis服务器时通过给定 --sentinel 选项来启动哨兵,哨兵的一些设计思路和zookeeper非常类似。 sentinel的定时任务 sentinel机制中有三种重要的定时任务。 每10秒每个sentinel对master和slave执行info 作用: 发现slave节点。 确认主从关系。 每2秒每个sentinel通过master节点的channel交换信息(pub/sub) 作用: 互相通信掌握节点的信息和自身信息,可以感知新加入的sentinel >

深度学习-人脸识别DFACE模型pytorch训练(二)

别来无恙 提交于 2019-11-29 08:02:27
首先介绍一下 MTCNN 的网络结构, MTCNN 有三种网络,训练网络的时候需要通过三部分分别进行,每一层网络都依赖前一层网络产生训练数据供当前训练网络,这样也推动了两个网络之间的最小损耗。 Pnet Rnet Onet MTCNN 的人脸模型按照以上结构按照三部分进行训练。 DFace 有两个主要模块,即检测和识别。在这两个模块中,我们提供了有关如何训练模型和运行的所有教程。 首先设置一个 pytorch 和 cv2 ,版本要求: * pytorch==0.4.0 * torchvision==0.2.0 * opencv-python==3.4.0.12 pip install torch==0.4.0 torchvision==0.2.0 -i https://pypi.tuna.tsinghua.edu.cn/simple pip install opencv-python==3.4.0.12 -i h ttps://pypi.tuna.tsinghua.edu.cn/simple h 安装依赖库 matplotlib : pip install matplotlib ( 1 )首先将 DFace 包 git 到本地用户目录,不要放在根目录: git clone https://github.com/tuvia0213/DFace.git ( 2 )添加 DFace

ZooKeeper系统之(四):跟随者工作模式

拈花ヽ惹草 提交于 2019-11-29 08:01:52
当ZooKeeper集群启动之后,需要完成leader和follower之间的数据同步。 首先leader和observer有一个共同的父类learner,里面定义了一些公共方法。集群正常运行后会有一个leader和多个follower(这里observer就不单独说了,和follower的行为是类似的)。 1、 注册过程 follower在提供服务给客户端之前必须完成注册到leader的动作。 注册分为以下3个主要步骤: a) 调用connectToLeader方法连接到Leader。 b) 调用registerWithLeader方法注册到Leader,交换各自的sid、zxid和Epoch等信息,Leader以此决定事务同步的方式。 c) 调用SyncWithLeader跟Leader进行事务数据同步,处理SNAP/DIFF/TRUNC包。 这3个方法都定义在父类Learner类中。下面我们以Follower作为例子说明注册到Leader的完整流程。 2、connectToLeader connectToLeader方法功能较简单,创建Socket连接到Leader。该方法定义在Follower的父类Learner中。它加了重试机制,具体的代码这里就不给出了。 最多可以尝试5次连接

Timestamp to Epoch in a CSV file with GAWK

本小妞迷上赌 提交于 2019-11-29 07:14:18
Looking to convert human readable timestamps to epoch/Unix time within a CSV file using GAWK in preparation for loading into a MySQL DB. Data Example: {null};2013-11-26;Text & Device;Location;/file/path/to/;Tuesday, November 26 12:17 PM;1;1385845647 Looking to take column 6, Tuesday, November 26 12:17 PM, and convert to epoch time for storage. All times shown will be in EST format. I realize AWK is the tool for this, but can't quite seem to structure the command. Currently have: cat FILE_IN.CSV | awk 'BEGIN {FS=OFS=";"}{$6=strftime("%s")} {print}' However this returns: {null};2013-11-26;Text &

Convert an ISO date to seconds since epoch in linux bash

人走茶凉 提交于 2019-11-29 06:12:50
I have a date in the ISO format YYYY-MM-DDTHH:SS (e.g. 2014-02-14T12:30). I'd like to convert it in seconds since epoch using only the date command in linux bash. All the dates refer to UTC locale. I know that this question is easily eligible for duplicate... there are billions of questions about converting dates from one format to another but I can't find my particular scenario thank you... kguest With GNU date, specify the date to parse with -d and seconds since epoch with %s $ date -d"2014-02-14T12:30" +%s 1392381000 It is easier if you install gdate to deal with date strings that have

Why is microsecond timestamp is repetitive using (a private) gettimeoftheday() i.e. epoch

你离开我真会死。 提交于 2019-11-29 05:17:47
I am printing microseconds continuously using gettimeofday(). As given in program output you can see that the time is not updated microsecond interval rather its repetitive for certain samples then increments not in microseconds but in milliseconds. while(1) { gettimeofday(&capture_time, NULL); printf(".%ld\n", capture_time.tv_usec); } Program output: .414719 .414719 .414719 .414719 .430344 .430344 .430344 .430344 e.t.c I want the output to increment sequentially like, .414719 .414720 .414721 .414722 .414723 or .414723, .414723+x, .414723+2x, .414723 +3x + ...+ .414723+nx It seems that

Convert a column of datetimes to epoch in Python

爱⌒轻易说出口 提交于 2019-11-29 04:01:37
I'm currently having an issue with Python. I have a Pandas DataFrame and one of the columns is a string with a date. The format is : "%Y-%m-%d %H:%m:00.000". For example : "2011-04-24 01:30:00.000" I need to convert the entire column to integers. I tried to run this code, but it is extremely slow and I have a few million rows. for i in range(calls.shape[0]): calls['dateint'][i] = int(time.mktime(time.strptime(calls.DATE[i], "%Y-%m-%d %H:%M:00.000"))) Do you guys know how to convert the whole column to epoch time ? Thanks in advance ! convert the string to a datetime using to_datetime and then

Can strict JSON $dates be used in a MongoDB query?

落花浮王杯 提交于 2019-11-29 01:28:30
I'm trying to write a date comparison query using MongoDB's strict JSON representation of BSON . I'd like it to work in the MongoDB shell (v2.4.3) Here's what I've tried... Setup: create a new document with an at date of Jan 1, 2020 > db.myTimes.insert({"at": new Date("2020-01-01")}) Using non-strict query for date > 2010, no problem: > db.myTimes.find({"at": {"$gt": new Date("2010-01-01")}}) { "_id" : ObjectId([snipped]), "at" : ISODate("2020-01-01T00:00:00Z") } Using strict JSON query, however... NO DICE > db.myTimes.find({"at": {"$gt": {"$date":"2010-01-01T00:00:00Z"}}}) > db.myTimes.find({

Localizing Epoch Time with pytz in Python

大城市里の小女人 提交于 2019-11-28 23:36:38
问题 Im working on converting epoch timestamps to dates in different timezones with pytz. What I am trying to do is create a DateTime object that accepts an Olson database timezone and an epoch time and returns a localized datetime object. Eventually I need to answer questions like "What hour was it in New York at epoch time 1350663248?" Something is not working correctly here: import datetime, pytz, time class DateTime: def __init__(self, timezone, epoch): self.timezone = timezone self.epoch =

How to convert epoch to datetime redshift?

这一生的挚爱 提交于 2019-11-28 23:04:53
I work in dbeaver. I have a table x. TABLE x has a column "timestamp" 1464800406459 1464800400452 1464800414056 1464800422854 1464800411797 The result I want: Wed, 01 Jun 2016 17:00:06.459 GMT Wed, 01 Jun 2016 17:00:00.452 GMT Wed, 01 Jun 2016 17:00:14.056 GMT Wed, 01 Jun 2016 17:00:22.854 GMT Wed, 01 Jun 2016 17:00:11.797 GMT I tried redshift query SELECT FROM_UNIXTIME(x.timestamp) as x_date_time FROM x but didn't work. Error occurred: Invalid operation: function from_unixtime(character varying) does not exist I also tried SELECT DATE_FORMAT(x.timestamp, '%d/%m/%Y') as x_date FROM x Error