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MapReduce, mail # user - hadoop missing file?


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hadoop missing file?
ch huang 2013-07-30, 06:54
one of my workmate told me some of his file missing ,i use fs check find
following info , how can i prevent  them from missing? anyone can help me?

Status: HEALTHY
 Total size:    272020850157 B (Total open files size: 652056 B)
 Total dirs:    1143
 Total files:   1886 (Files currently being written: 2)
 Total blocks (validated):      5651 (avg. block size 48136763 B) (Total
open file blocks (not validated): 1)
 Minimally replicated blocks:   5651 (100.0 %)
 Over-replicated blocks:        0 (0.0 %)
 Under-replicated blocks:       129 (2.2827818 %)
 Mis-replicated blocks:         0 (0.0 %)
 Default replication factor:    3
 Average block replication:     3.0
 Corrupt blocks:                0
 Missing replicas:              903 (5.0571237 %)
 Number of data-nodes:          3
 Number of racks:               1
FSCK ended at Tue Jul 30 14:38:01 CST 2013 in 462 milliseconds