hadoop-hdfs-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
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
<property>
        <name>hadoop.tmp.dir</name>
        <value>/root/Hadoop/hadoop-root</value>
        <description>A base for other temporary directories.</description>
</property>

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 [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

::DISCLAIMER::
-----------------------------------------------------------------------------------------------------------------------

The contents of this e-mail and any attachment(s) are confidential and intended for the named
recipient(s) only.
It shall not attach any liability on the originator or HCL or its affiliates. Any views or
opinions presented in
this email are solely those of the author and may not necessarily reflect the opinions of
HCL or its affiliates.
Any form of reproduction, dissemination, copying, disclosure, modification, distribution and
/ or publication of
this message without the prior written consent of the author of this e-mail is strictly prohibited.
If you have
received this email in error please delete it and notify the sender immediately. Before opening
any mail and
attachments please check them for viruses and defect.

-----------------------------------------------------------------------------------------------------------------------

Mime
View raw message