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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