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From andreina <andrein...@huawei.com>
Subject Query regarding the configuration in hdfs-site.xml
Date Wed, 25 Apr 2012 08:19:02 GMT
Hi,

    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
automatically".

Scenario 2:

========

"dfs.namenode.safemode.min.datanodes"=2147483647

 

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

==========

dfs.namenode.safemode.threshold-pct=1

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
automatically".

 


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