J.Andreina created HDFS-3320:
--------------------------------
Summary: When dfs.namenode.safemode.min.datanodes is configured
there is a mismatch in UI report
Key: HDFS-3320
URL: https://issues.apache.org/jira/browse/HDFS-3320
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.23.1
Reporter: J.Andreina
Priority: Minor
Scenario 1:
step 1: dfs.namenode.safemode.min.datanodes =2 in hdfs-site.xml
step 2: start NN
Since the datanode threshold is 2 until 2 DN is up NN will not come out of
safemode.
•But in UI report always displays that need additionally (datanodeThreshold -
numLive) + 1 . which can be avoided.
•And "Safe mode will be turned off automatically." message is not required.
because only if the required DN is up it will be turned off
UI report
=========
"Safe mode is ON. The number of live datanodes 0 needs an additional 3 live
datanodes to reach the minimum number 2. Safe mode will be turned off
automatically."
Scenario :2
configuring to interger.max value : dfs.namenode.safemode.min.datanodes
=2147483647
UI report
========
"Safe mode is ON. The number of live datanodes 0 needs an additional
-2147483648 live datanodes to reach the minimum number 2147483647. Safe mode
will be turned off automatically."
NN logs:
========
2012-04-24 19:09:33,181 INFO org.apache.hadoop.hdfs.StateChange: STATE* Safe
mode ON.
The number of live datanodes 0 needs an additional -2147483648 live datanodes
to reach the minimum number 2147483647. Safe mode will be turned off
automatically.
Code:
=====
{noformat}
if (numLive < datanodeThreshold) {
if (!"".equals(msg)) {
msg += "\n";
}
msg += String.format(
"The number of live datanodes %d needs an additional %d live "
+ "datanodes to reach the minimum number %d.",
numLive, (datanodeThreshold - numLive) + 1 , datanodeThreshold);
}
{noformat}
instead of (datanodeThreshold - numLive) + 1 it can be (datanodeThreshold -
numLive).
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