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From Uma Maheswara Rao G 72686 <mahesw...@huawei.com>
Subject Re: Missing Replicas and Under replicated blocks
Date Mon, 17 Oct 2011 06:36:47 GMT
Hi Stuti,
You can set the replication factor to 3. So, that it can satisfy 100% replication with it.

 You can use FileSystem#setReplication API for setting it.

Regards,
Uma
----- Original Message -----
From: Stuti Awasthi <stutiawasthi@hcl.com>
Date: Monday, October 17, 2011 11:52 am
Subject: Missing Replicas and Under replicated blocks
To: "hdfs-user@hadoop.apache.org" <hdfs-user@hadoop.apache.org>

> Hi ,
> 
> I have a mini Hadoop cluster of 3 nodes with  DN and TT running on 
> each node and replication is set to 3.By mistake I tried to write 
> few files which requires replication of 10. When I checked the 
> HDFS status with FSCK utility it shows :
> 
> /root/Hadoop/hadoop-
> root/mapred/system/job_201109201112_0001/job.jar 2352841 bytes, 1 
> block(s):  Under replicated blk_-9220069752024407718_1546. Target 
> Replicas is 10 but found 3 replica(s).
> 0. blk_-9220069752024407718_1546 len=2352841 repl=3 
> [10.33.100.74:50010, 10.33.64.235:50010, 10.33.100.117:50010]
> 
> /root/Hadoop/hadoop-
> root/mapred/system/job_201109201112_0001/libjars <dir>
> /root/Hadoop/hadoop-
> root/mapred/system/job_201109201112_0001/libjars/hadoop-0.20.2-
> core.jar 2707856 bytes, 1 block(s):  Under replicated blk_-
> 4791859336845413240_1544. Target Replicas is 10 but found 3 
> replica(s).0. blk_-4791859336845413240_1544 len=2707856 repl=3 
> [10.33.100.74:50010, 10.33.64.235:50010, 10.33.100.117:50010]
> ....................................................
> Status: HEALTHY
> Total size:    45239704 B
> Total dirs:    101
> Total files:   88 (Files currently being written: 3)
> Total blocks (validated):      88 (avg. block size 514087 B) 
> (Total open file blocks (not validated): 3)
> Minimally replicated blocks:   88 (100.0 %)
> Over-replicated blocks:        0 (0.0 %)
> Under-replicated blocks:       20 (22.727272 %)
> Mis-replicated blocks:         0 (0.0 %)
> Default replication factor:    2
> Average block replication:     2.4318182
> Corrupt blocks:                0
> Missing replicas:              140 (65.42056 %)
> Number of data-nodes:          3
> Number of racks:               1
> 
> I wanted to know that can I fix :
>        1.     Under-replicated
>        2.     Missing replicas
> 
> Please Suggest
> Thanks
> Stuti
> 
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