[Hadoop] replication 수 변경 및 확인 방법

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hadoop replication 수를 명령어로 설정 가능합니다

1. 적용

hadoop fs -setRep 12 [path]

2. 확인

• fsck 명령어로 입력 후 Agerage block replication을 확인하면 됩니다.

hdfs fsck [path]

..................Status: HEALTHY
 Total size:    27820207400 B
 Total dirs:    419
 Total files:   418
 Total symlinks:                0
 Total blocks (validated):      418 (avg. block size 66555520 B)
 Minimally replicated blocks:   418 (100.0 %)
 Over-replicated blocks:        0 (0.0 %)
 Under-replicated blocks:       1 (0.23923445 %)
 Mis-replicated blocks:         0 (0.0 %)
 Default replication factor:    3
 Average block replication:     11.997607
 Corrupt blocks:                0
 Missing replicas:              1 (0.019936204 %)
 Number of data-nodes:          233
 Number of racks:               19