openstack ha

zookeeper, the data is stored to the Zoopeeper, there are several alternate master, according to the document, in the spark-env.sh set the following parameters, restart.Spark_daemon_java_opts= "-dspark.deploy.recoverymode=zookeeper-dspark.deploy.zookeeper.url=hadoop1:2181,hadoop2 : 2181,hadoop3:2181-dspark.deploy.zookeeper.dir=/spark "1.master nodes are automatically switched. 2. You need to configure the master in the spark-defaults.conf of Spark toSpark.master spark://hadoop2:7077,hadoop3:707

(ipaddr_192.168.1.150) [12022]:info:ipstatus=ok,ip_cip=mar31 NBSP;09:34:48NBSP;FRANKTEST02NBSP;/USR/LIB/OCF/RESOURCE.D//HEARTBEAT/IPADDR (IPaddr_192.168.1.150) [11996]: info:success#tail /var/log/messages If you do not start from the server, so start the primary server later to start from the server reason: I think of a problem, I remember the class when I only start the Lord's heartbeat, from the time of the start, The Lord does not start the VIP and Nginx services, because the master has a ju

Juniper-ha SSG Series Cluster-id solutions to scarcity problems.Http://forums.juniper.net/t5/ScreenOS-Firewalls-NOT-SRX/Cluster-ID-issue-on-ssg140/m-p/15312//true(Answer from Juniper's official technician)By default, NSRP would support up to 8 cluster ID ' s and 8 VSD ' s. As noted in the previous entry, you can increase this with the Envar, but you need to use them in multiples of 8, and the combination of cluster ID ' s and VSD ' s cannot exceed . Y

Xen-server for single-point failover High Availability (HA)Create a new resource pool (the pool in this place is the server Xen-server pool)650) this.width=650; "height=" src= "http://a3.qpic.cn/psb?/594581eb-e62e-4426-a878-953c87dd5729/* shhfudflmmuj6cyulqkfinqlzgvpdx5erq0qjlcrke!/b/dgybaaaaaaaaek=1kp=1pt=0bo=igfjaaaaaaadae8! su=0202829665tm=1481868000sce=0-12-12rf=2-9 "width=" 289 "style=" margin:0px;padding:0px; border-width:0px;border-style:none;v

Hadoop HA has been started before, so you will see many processes)23703 NameNode23968 ResourceManager24132 DFSZKFailoverController23813 DataNode24857 HRegionServer24723 HMaster23428 QuorumPeerMain23522 JournalNode25448 Jps24070 NodeManagerRegionserver9832 HRegionServer8923 QuorumPeerMain9379 NodeManager10495 Jps9197 DataNode9622 ResourceManager9006 JournalNode10436 NameNode9552 DfszkfailovercontrollerStart Hmaster on a regionserverhbase-daemon.sh Sta

First, Introduction1.1 Background:In the case of a possible Namenode single point of failure (SPOF) or short-term inability in Hadoop 1.x, Hadoop 2.x has been improved by adding a namenode, and after adding a namenode, there is no real problem Only one namenode is required, so two Namenode one is in standby state and one is in active state. Standby does not provide services, synchronizing only the state of the active Namenode so that active Namenode is switched to the active state in a timely ma

First, the cluster concept:Cluster : Improve performance, reduce costs, improve scalability, enhance reliability, and task control room core technologies in the cluster. The role of the cluster : To ensure continuous businessCluster of three networks: Business Network , cluster network, storage networkIi. three types of clusters:HA: Highly available cluster --"The cluster under study" LP: Load Balancing clusterHPC: Distributed clustersThird, HA Mode

Proxy layer HA of codis For Java users, you can use the modified Jedis ------- Jodis to implement HA on the proxy layer. It monitors the registration information on zk to obtain the list of currently available proxies in real time, which can ensure high availability or achieve Load Balancing by requesting all proxies in turn. The jodis address is as follows: Https://github.com/wandoulabs/codis/tree/master/e

When testing the namenode ha of hdfs2.0, concurrently put a file of MB and kill the master NN. After the slave NN is switched, the process exits. 2014-09-03 11:34:27,221 FATAL org.apache.hadoop.hdfs.server.namenode.FSEditLog: Error: recoverUnfinalizedSegments failed for required journal (JournalAndStream(mgr=QJM to [10.136.149.96:8485, 10.136.149.97:8485, 10.136.149.99:8485], stream=null))org.apache.hadoop.hdfs.qjournal.client.QuorumException: Got to

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Click Browserfilesystem, and the command to see the results likeWhen we look at the Hadoop source, we see the Hdfs-default.xml file information under HDFsWe look for ${hadoop.tmp.dir} This is a reference variable, certainly in other files are defined, see in Core-default.xml, these two profiles have one thing in common:Just do not modify this file, but you can copy the information to Core-site.xml and hdfs-site.xml to modifyUsr/local/hadoop is where I store my Hadoop folder.Several important doc

Highly available clustersI. What is a highly available clusterA highly available cluster is when one node or server fails, another node automatically and immediately provides services, and the resources on the failed node are transferred to another node, so that the other node has resources that can provide services to the outside. When a highly available cluster is used for a single node failure, the ability to automatically switch resources and services can ensure that the service remains onli

I. What is a highly available clusterA highly available cluster is when one node or server fails, another node automatically and immediately provides services, and the resources on the failed node are transferred to another node, so that the other node has resources that can provide services to the outside. When a highly available cluster is used for a single node failure, the ability to automatically switch resources and services can ensure that the service remains online. In this process, it i

This series of articles The security of memcached, which carries a huge access to the backend database, is of great significance.Brief description of Ha, if time allows to practice the next scenario as much as possible, then compare the pros and cons of each scheme horizontally.650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M00/86/09/wKiom1ezHaqg5aLkAABQEOh39c8884.png "title=" Sogou 20160816220056.png "alt=" Wkiom1ezhaqg5alkaabqeoh39c8884.png

First, the preparation before installing heartbeat 1. Hardware required for heartbeat cluster The hardware devices necessary to build a heartbeat cluster system are: Node server Networks and network adapters Shared disks (1) Node server Installation of heartbeat requires at least two hosts, and the requirements of the host is not high, ordinary PC server can meet the requirements, of course, can also be installed on the virtual machine heartbeat, now heartbeat can be very well run under t

High Availability ha Highavailable 1, the need heartbeat mechanism to detect whether the back-end RS provide services. A) detection down, need to remove the RS from LVs B probe send from down to up, need to add RS again from LVS. 2, Lvs DR, need to master (HA) Keepalived: Provides highly available VRRP protocol to realize the drift of IP Zookeeper: The difference between keepalived and zookeeper is that

Spark Streaming 1.2 provides a Wal based fault-tolerant mechanism (refer to the previous blog post http://blog.csdn.net/yangbutao/article/details/44975627), You can guarantee that the calculation of the data is executed at least once, However, it is not guaranteed to perform only once, for example, after Kafka receiver write data to Wal, to zookeeper write offset failed, then after the driver failure recovery, due to offset or previously written offset position, The data will be pulled from the

Questions Guide 1. How to create/delete topic. What processes are included in the 2.Broker response request. How the 3.LeaderAndIsrRequest responds. This article forwards the original link http://www.jasongj.com/2015/06/08/KafkaColumn3 In this paper, based on the previous article, the HA mechanism of Kafka is explained in detail, and the various HA related scenarios such as broker Failover,controller Fail

Sentinel First of all, Sentinel,sentinel is a redis comes with a way to implement Ha, if the actual application of this way with less, more popular or keepalived.The Redis Sentinel system is used to manage multiple Redis servers (instance) that perform the following three tasks:Monitoring (Monitoring): Sentinel will constantly check whether your primary server and slave server are functioning properly.Reminder (Notification): When a problem occurs wi

HeartBeat + DRBD and MySQL replication are a common way for many businesses to use. For the integrity and consistency of the data, the two architectures need to consider 2 important parameter innodb_flush_log_at_trx_commit and Sync_binlog parameters. This article mainly refers to the MySQL 5.6 Reference manual A detailed description of the 2 parameters listed.1, Heartbeat + DRBD or replication? Cost:additional Passive master server (not handing any application traffic) is needed? Performance:to