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From Suresh Srinivas <sures...@yahoo-inc.com>
Subject Re: Who can tell the meaning from fsck
Date Wed, 24 Feb 2010 18:48:10 GMT



On 2/24/10 12:25 AM, "jian yi" <eyjian@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 %)
// Number of blocks with number of replicas >= minimum number of replicas configured in
"dfs.namenode.replication.min"
 Over-replicated blocks:        0 (0.0 %)
// Number of blocks that have more replicas than the replication factor of the file
 Under-replicated blocks:       0 (0.0 %)
// Number of blocks that have less replicas than the replication factor of the file
 Mis-replicated blocks:         7 (0.013665469 %)
// Blocks with replicas that does not satisfy topology rules. For example instead of 2 replicas
in 1 rack and 1 replica in a separate block, all replicas ended up on the same rack.
 Default replication factor:    3
// Default replication factor used by the system
 Average block replication:     3.0
// Average replicas per block
 Missing replicas:              0 (0.0 %)
// Blocks with all the replicas missing
 Number of data-nodes:          83
 Number of racks:               6


Who can tell me the meaning of items? Thanks.

Regards
Jian Yi


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