hadoop任务的相关内容

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问答 2021-12-05 来自：开发者社区

Hadoop 中仅作为库存在，可以在单计算机上执行 MapReduce 任务的模式是什么呢？

问答 2021-12-05 来自：开发者社区

Hadoop中用于执行MapReduce任务的机器角色有哪些？

问答 2021-12-04 来自：开发者社区

Hadoop shuffle中每一个map任务都有一个什么用于存储任务输出？

问答 2020-06-22 来自：开发者社区

执行了这样一个hive sql select * from nginx_log where remote_address='10.10.126.126'; 这个nginx的日志文件有200多m 就一个文件。执行了10分钟 map一直是百分之0 错误日志如下 2013-07-22 15:12:52,720 WARN org.apache.hadoop.conf.Configuration: /p.....

文章 2019-12-26 来自：开发者社区

实践Hadoop MapReduce 任务的性能翻倍之路

作者：李万雪， eBay软件开发工程师，2017年毕业于上海交通大学。目前负责日志在大数据平台上的分析和opentracing在ebay日志平台的实现。原文链接：https://mp.weixin.qq.com/s?__biz=MzA3MDMyNDUzOQ==&mid=2650505625&idx=1&sn=374ae0fdf7b02cf3dfdd9180580204c....

问答 2018-07-20 来自：开发者社区

hadoop伪分布式上跑mapreduce任务报错：Job status not available

用Eclipse的hadoop插件向集群提交代码时报错：Exception in thread "main" java.io.IOException: Job status not available 错误信息如下任务应该已经是提交到了集群上的，我在hdfs上看到生成了相应output文件夹在网上查原因说是要配置mapred-site.xml文件，照着弄了一遍还是一样的错误。在虚拟机中配置的ma....

文章 2017-12-23 来自：开发者社区

Hadoop 少量map/reduce任务执行慢问题

最近在做报表统计，跑hadoop任务。之前也跑过map/reduce但是数据量不大，遇到某些map/reduce执行时间特别长的问题。执行时间长有几种可能性： 1. 单个map/reduce任务处理的任务大。需要注意每个任务的数据处理量大小不至于偏差太大。可以切割部分大文件。 2. map数量过多, reduce拉取各方数据慢这种情况...

文章 2017-11-16 来自：开发者社区

Hadoop HDFS中的数据块和Map任务的分片

HDFS的数据块磁盘数据块是磁盘进行数据读/写的最小单位，一般是512字节, 而HDFS中也有数据块，默认为64MB。所以HDFS上的大文件被分为许多个chunk.而HDFS上的小文件（小于64MB)的文件不会占据整个块的空间。 HDFS数据块设置大的原因是减少寻址开销，数据备份也是以块为单位的。用hadoop fsck / -files -blocks 命令可以检查HDFS根目录(/)下所....

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