Moving to common-u...@h.a.o Answers inline . On 2/24/10 12:25 AM, "jian yi" <eyj...@gmail.com> wrote:
Hi All, Run hadoop fsck / will give you summary of current HDFS status including some useful information : Minimally replicated blocks: 51224 (100.0 %) These are the minimally replicated block , you can set minimum block replication factor in hdfs-site.xml . If there are any blocks which are not minimally replicated then NN will try to replicate them. Over-replicated blocks: 0 (0.0 %) These are the excessive replicated block. Over-replicated blocks are harmless and could have been created due to running Balancer. Under-replicated blocks: 0 (0.0 %) Blocks which are under-replicated than min Mis-replicated blocks: 7 (0.013665469 %) blocks that do not satisfy block placement policy Default replication factor: 3 Default block replication factor set using <name>dfs.replication</name> <value>3</value> Average block replication: 3.0 Average BR Missing replicas: 0 (0.0 %) If there are any missing block replicas then that count is listed here. Number of data-nodes: 83 Number of data nodes in your cluster Number of racks: 6 Number of Racks in your cluster You can configure your block replications by using following config settings in hdfs-site.xml <property> <name>dfs.replication</name> <value>3</value> <description>Default block replication. The actual number of replications can be specified when the file is created. The default is used if replication is not specified in create time. </description> </property> <property> <name>dfs.replication.max</name> <value>512</value> <description>Maximal block replication. </description> </property> <property> <name>dfs.replication.min</name> <value>1</value> <description>Minimal block replication. </description> </property> -- Ravi
