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From Stuti Awasthi <stutiawas...@hcl.com>
Subject RE: Missing Replicas and Under replicated blocks
Date Tue, 18 Oct 2011 04:07:58 GMT
Thanks Harsh,
I will go through what you have suggested. But I think these options will help to prevent
under replicated blocks. What about missing replicas. Is there any way to fix it or to prevent
it ?

-----Original Message-----
From: Harsh J [mailto:harsh@cloudera.com] 
Sent: Monday, October 17, 2011 10:58 PM
To: hdfs-user@hadoop.apache.org
Subject: Re: Missing Replicas and Under replicated blocks

Stuti,

You'll want to:

1. Set "2" for mapred.submit.replication in mapred-site.xml to prevent the job related staging
files to be created with default replication factor of 10.
2. Learn about the "-setrep" option to toggle replication factors of a path. See http://hadoop.apache.org/common/docs/current/file_system_shell.html#setrep

HTH.

On Mon, Oct 17, 2011 at 11:51 AM, Stuti Awasthi <stutiawasthi@hcl.com> wrote:
> 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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--
Harsh J

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