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From Stuti Awasthi <stutiawas...@hcl.com>
Subject RE: Missing Replicas and Under replicated blocks
Date Mon, 17 Oct 2011 06:32:11 GMT
After some search I found out few things which I think can be linked in some way but I am not
sure. If anyone can suggest on this :

1. I have set <hadoop.tmp.dir> value in core-site.xml
        <description>A base for other temporary directories.</description>

2. I have not set <mapred.system.dir> separately in conf files.
3. In servers directory structure ${ hadoop.tmp.dir}/mapred, "system" directory is not created.
4. "system " is created under /tmp directory :          /tmp/hadoop-root/mapred/system

Can all this be linked with Missing replicas ?

-----Original Message-----
From: Stuti Awasthi
Sent: Monday, October 17, 2011 11:52 AM
To: hdfs-user@hadoop.apache.org
Subject: Missing Replicas and Under replicated blocks

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 [,,]

/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 [,,] ....................................................
 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


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