Actually, My java client is running with the same configuration as the hadoop's . The dfs.replication is already set as 2 in my hadoop's configuration.
So i think the dfs.replication is already overrided by my configuration in hdfs-site.xml. but seems it doesn't work even i overrided the parameter evidently. 发件人: Емельянов Борис [mailto:emelya...@post.km.ru] 发送时间: Monday, July 01, 2013 15:18 收件人: user@hadoop.apache.org 主题: Re: a question about dfs.replication On 01.07.2013 10:19, Francis.Hu wrote: Hi, All I am installing a cluster with Hadoop 2.0.5-alpha. I have one namenode and two datanodes. The dfs.replication is set as 2 in hdfs-site.xml. After all configuration work is done, I started all nodes. Then I saved a file into HDFS through java client. nOW I can access hdfs web page: x.x.x.x:50070,and also see the file is already listed in the hdfs list. My question is: The replication column in HDFS web page is showing as 3, not 2. Does anyone know What the problem is? ---Actual setting of hdfs-site.xml <property> <name>dfs.replication</name> <value>2</value> </property> After that, I typed dfsamdin command to check the file: hdfs fsck /test3/ The result of above command: /test3/hello005.txt: Under replicated BP-609310498-192.168.219.129-1372323727200:blk_-1069303317294683372_1006. Target Replicas is 3 but found 2 replica(s). Status: HEALTHY Total size: 35 B Total dirs: 1 Total files: 1 Total blocks (validated): 1 (avg. block size 35 B) Minimally replicated blocks: 1 (100.0 %) Over-replicated blocks: 0 (0.0 %) Under-replicated blocks: 1 (100.0 %) Mis-replicated blocks: 0 (0.0 %) Default replication factor: 2 Average block replication: 2.0 Corrupt blocks: 0 Missing replicas: 1 (33.333332 %) Number of data-nodes: 3 Number of racks: 1 FSCK ended at Sat Jun 29 16:51:37 CST 2013 in 6 milliseconds Thanks, Francis Hu If I'm not mistaking "dfs.replication" parameter in config sets only default replication factor, which can be overrided when putting file to hdfs.
