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HDFS中两种random read比较

code version: hadoop-0.19.1   首先说pread。pread会明确的把要读的size传给datanode（在new BlockReader的时候）   /** * Read bytes starting from the specified position. * * @param position start read f ...
hadoophdfsrandom read 
standalone 评论(0) 有4173人浏览 2009-08-13 20:40

How Does HDFS Deletes Files?

In the HDFS design document, it introduces deletes and undeletes in HDFS.   File Deletes and Undeletes When a file is deleted by a user or an application, it is not immediately removed from ...
hadoophdfsdelete 
standalone 评论(0) 有2169人浏览 2009-07-30 15:04

HDFS的写操作策略

量了一下4个datanode时候HDFS写操作时每个node分配block的情况，每个datanode是4张disk，写了个脚本处理log后发现平均每个node分配的block数量占写的
HDFSwrite 
standalone 评论(0) 有1471人浏览 2009-07-21 17:15

Advantages of Kosmix's KFS vs. HDFS

A post about KFS vs. HDFS October 02, 2007 Advantages of Kosmix's KFS vs. HDFS I was excited to learn last week that my friends at Kosmix have decided to open source a project long in the works: the ...
HDFSKFS 
standalone 评论(0) 有1466人浏览 2009-07-21 17:12

HDFS NotReplicatedYetException

I encounter exception below when I use copyFromLocal to copy several big files (10G) to HDFS. Hadoop guy’s word to explain this:  “I noticed the same recently. For me it happened since the datanodes w ...
HDFS 
standalone 评论(0) 有6881人浏览 2009-07-21 16:57

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