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From "Phan, Truong Q" <Troung.P...@team.telstra.com>
Subject how to free up space of the old Data Node
Date Thu, 20 Mar 2014 02:34:36 GMT

I have 3 nodes Hadoop cluster in which I created 3 Data Nodes.
However, I don't have enough space in one of the node to cater other projects' log. So I decommissioned
this node from a Data node list but I could not re-claimed the space from it.
Is there a way to get this node to release space?

[root@nsda3dmsrpt02] /data/dfs/dn# du -sh /data/dfs/dn/*
47G     /data/dfs/dn/current

$ sudo -u hdfs hadoop fsck /data
DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead use the hdfs command for it.

Total size:    7186453688 B
Total dirs:    11
Total files:   62
Total symlinks:                0
Total blocks (validated):      105 (avg. block size 68442416 B)
Minimally replicated blocks:   105 (100.0 %)
Over-replicated blocks:        0 (0.0 %)
Under-replicated blocks:       105 (100.0 %)
Mis-replicated blocks:         0 (0.0 %)
Default replication factor:    3
Average block replication:     2.0
Corrupt blocks:                0
Missing replicas:              105 (33.333332 %)
Number of data-nodes:          2
Number of racks:               1
FSCK ended at Thu Mar 20 13:30:03 EST 2014 in 22 milliseconds

The filesystem under path '/data' is HEALTHY

Thanks and Regards,
Truong Phan
Senior Technology Specialist
Database Engineering
Transport & Routing Engineering | Networks | Telstra Operations


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