hadoop节点的相关内容

文章 2017-08-02 来自：开发者社区

Hadoop 添加删除数据节点（datanode）

前提条件：添加机器安装jdk等，最好把环境都搞成一样，示例可做相应改动实现目的：在hadoop集群中添加一个新增数据节点。 1. 创建目录和用户 mkdir -p /app/hadoop groupadd hadoop useradd licz -g hadoop -d /app/hadoop chown licz:hadoop /app...

文章 2017-08-01 来自：开发者社区

本文章我们使用hadoop2.6.0版本配置Hadoop集群，同时配置NameNode+HA、ResourceManager+HA，并使用zookeeper来管理Hadoop集群。 1.1 写在前面的话 1.2 (一)HDFS概述 1.2.1 基础架构 1、NameNode(Master) 1)命名空间管理：命名空间支持对HDFS中的目录、文件和块做类似文件系统的创建、修改、删除、列表文件和目录....

文章 2017-05-29 来自：开发者社区

datenode节点超时时间设置，Hadoop启动不正常,HDFS冗余数据块的自动删除,NameNode安全模式问题,ntp时间服务同步,机架感知配置

1.Hadoop datanode节点超时时间设置 datanode进程死亡或者网络故障造成datanode无法与namenode通信，namenode不会立即把该节点判定为死亡，要经过一段时间，这段时间暂称作超时时长。HDFS默认的超时时长为10分钟+30秒。如果定义超时时间为timeout，则超时时长的计算公式为： &nb...

文章 2016-11-27 来自：开发者社区

hadoop2.5.2 启动成功后，用jps查看节点：发现少了DataNode

使用less ~/hadoop-2.5.2/logs/hadoop-zkpk-datanode-pxe01.log 查看日志得知： datanode的clusterID 和 namenode的clusterID 不匹配。解决办法: 1.找到 ~/hadoopdata/dfs/name/current/VERSION 里的 clusterID 2.复制clusterID到各个没...

文章 2016-11-25 来自：开发者社区

Hadoop 集群启动后，从节点的NodeManager没有启动解决

1.slaves节点报错，报的是启动nodemanager 所需内存不足解决： a: 修改 yarn-site.xml 中的yarn.scheduler.minimum-allocation-mb 内存大于1024， b.修改 yarn-env.sh 中 JAVA_HEAP_MAX=-Xmx3072m 改为3G 2.nodemanager节点报错Unexpected ...

问答 2016-07-13 来自：开发者社区

hadoop 多借点，只能启动其中一个节点，求助大神

Linux 服务器，设置有2个节点，但是启动的时候只能启动一个节点，如果挂载单个节点的话，两台服务器都没问题，求助

文章 2016-03-10 来自：开发者社区

Hadoop2.7实战v1.0之动态添加DataNode和NodeManager节点(不修改dfs.replication)

Hadoop2.7实战v1.0之动态添加DataNode和NodeManager节点(不修改dfs.replication)【终极版】 0.添加大文件到hdfs系统中去,是为了后期的动态添加datanode的机器，datanode机器的数据量不均衡，为了模拟均衡实验点击(此处)折叠或打开 [root@sht-sgmhadoo...

文章 2016-03-07 来自：开发者社区

Hadoop2.7实战v1.0之动态删除DataNode(含NodeManager)节点(修改dfs.replication)

动态删除DataNode(含NodeManager)节点(修改dfs.replication)【终极版】 1.ActiveNameNode修改hdfs-site.xml文件点击(此处)折叠或打开 [root@sht-sgmhadoopnn-01 hadoop]# vi hdfs-site.xml ...

文章 2016-03-06 来自：开发者社区

Hadoop2.7实战v1.0之添加DataNode节点后,更改文件复制策略dfs.replication

1.查看当前系统的复制策略dfs.replication为3,表示文件会备份成3份a.通过查看hdfs-site.xml 文件点击(此处)折叠或打开 [root@sht-sgmhadoopnn-01 ~]# cd /hadoop/hadoop-2.7.2/etc/hadoop [root@sht-sgmhadoopnn-0...

文章 2016-03-05 来自：开发者社区

Hadoop2.7实战v1.0之动态添加、删除DataNode节点及复制策略导向

一.环境 IP Host 及安装软件部署模块进程 172.16.101.55 ...

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