hadoop-hdfs-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From andreina <andrein...@huawei.com>
Subject Query regarding the configuration in hdfs-site.xml
Date Wed, 25 Apr 2012 08:19:02 GMT

    When "dfs.namenode.safemode.min.datanodes" is configured to n

So namenode will be in safemode until n DN are registered with the namenode


But in UI it displays that n+1 datanodes are additionally needed. And "safe
mode will be turned off automatically " message is also displayed .


"dfs.namenode.safemode.min.datanodes" =2

Started the NN

The UI report displays that 


"Safe mode is on.The number of live datanodes 0 needs additional 3 live
datanodes to reach the minimum number 2. Safe mode will turned off

Scenario 2:




UI report

"Safemode is on.The number of live datanodes 0  needs additional  live
datanodes  -2147483648  to reach the minimum number 2147483647. Safe mode
will turned off automatically"


As per the given description when the configured value is reached the
namenode comes out of safemode

But Why In the UI report shows that it needs additional n+1 datanode needed
when configured to n ?



For the configuration dfs.namenode.safemode.threshold-pct  also adds one
block extra in the UI report

Scenario :3



Started NN,2DN

Wrote a file with 167 blocks

Stoped 2DN and NN

Started NN

UI report:

"Safemode is on.The reported blocks 0 needs additional 168 blocks to reach
threshold 1.000 0f total blocks 167.Safe mode will turned off


Huawei Technologies India Pvt. Ltd.
Level 3,4 &5 Leela Galleria, The Leela Palce 
23, Airport Road, Bangalore - 560008

 <http://www.huawei.com> www.huawei.com
This e-mail and its attachments contain confidential information from
HUAWEI, which 
is intended only for the person or entity whose address is listed above. Any
use of the 
information contained herein in any way (including, but not limited to,
total or partial 
disclosure, reproduction, or dissemination) by persons other than the
recipient(s) is prohibited. If you receive this e-mail in error, please
notify the sender by 
phone or email immediately and delete it!


View raw message