TCP closing a connection

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TCP closing a connection

client closes socket: clientSocket.close(); step1 :client sends TCP FIN control segment to server step2: Server receives FIN,replies with ACK. Closes connection,sends FIN. time wait 30 seconds(in order to receive the package which already send but un…

Linux下启动tomcat报错，WARN org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect java.net.ConnectException:

tomcat启动完了之后,一直不停的打印这种错误信息,看表面上,应该是zk节点下的数据是空的,连接不上服务,所以一直在尝试连接,然后一直又连不上: 完整的错误信息: 407662 [usf-ZooKeeper:dsf_default-Registry-SendThread(127.0.0.1:2181)] INFO org.apache.zookeeper.ClientCnxn - Opening socket connection to server 127.0.0.1/127.0.0.1:2…

WARN Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect (org.apache.zookeeper.ClientCnxn)

[2017-05-19 13:32:14,933] INFO Waiting for keeper state SyncConnected (org.I0Itec.zkclient.ZkClient)[2017-05-19 13:32:15,028] INFO Opening socket connection to server hadoop02/192.168.233.201:2181. Will not attempt to authenticate using SASL (unknown…

WARN Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect (org.apache.zookeeper.ClientCnxn) java.net.ConnectException: Connection refused

1.启动kafka的脚本程序报如下所示的错误: [hadoop@slaver1 script_hadoop]$ kafka-start.sh start kafkaServer... [-- ::,] INFO Verifying properties (kafka.utils.VerifiableProperties) [-- ::,] INFO Property broker.id (kafka.utils.VerifiableProperties) [-- ::,] INFO Proper…

hadoop mapreduce 写入hbase报错 Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect

现象:map任务构造数据正常,reduce任务,开始也正常,速度很快 ,在hbase 的管理界面,可以看到,5W以上的请求数当reduce 执行到 70% 左右的时候,就堵住了,查看yarn的web界面,可以找到如下报错信息. 不会尝试使用SASL认证. 连接被拒绝. 错误原因,找不到zookeeper 的master. 最开始的时候,配置是这样注入的: conf.set("hbase.zookeeper.quorum","hostname01,hostname02,hos…

docker push dial tcp ...:443 getsockopt: connection refused

docker 在提交镜像的时候出现以下错误. 我用的是本地的仓库,所以tcp后面是我的ip地址. 错误信息: #docker push ubuntu docker push dial tcp 192.168.0.153:443: getsockopt: connection refused 原因及解决方案: 1.没有指定镜像要上传的地址,站点.默认的是docker.io docker push <namespace>/<image name> 解决方法: docker push…

关于JBoss -“Closing a connection for you,please close them yourself”

使用JNDI的方式从Jboss里获取数据连接(Connection)的方式,Jboss会管理connection,不需要自己手动去关闭,但Jboss老是提示需要自己来关闭connection,针对Jboss6的解决方法如下: Step One:修改%JBOSS_HOME%\server\default\deploy\jbossweb.sar\server.xml,将 <Valve className="org.jboss.web.tomcat.service.jca.CachedConne…

RT：How HTTP use TCP connection

In HTTP/0.9 (not used anymore), each request uses a separate TCP connection, and the end of a response is signalled by closing the connection. In HTTP/1.0, an unofficial but very widely supported "Connection: Keep-Alive" request header can be us…

Coping with the TCP TIME-WAIT state on busy Linux servers

Coping with the TCP TIME-WAIT state on busy Linux servers 文章源自于:https://vincent.bernat.im/en/blog/2014-tcp-time-wait-state-linux.html Do not enable net.ipv4.tcp_tw_recycle. The Linux kernel documentation is not very helpful about whatnet.ipv4.tcp_tw_…

Configure the max limit for concurrent TCP connections（转）

To keep the TCP/IP stack from taking all resources on the computer, there are different parameters that control how many connections it can handle. If running applications that are constantly opening and closing connections (P2P), or are providing a…