ayushtkn commented on code in PR #5569:
URL: https://github.com/apache/hadoop/pull/5569#discussion_r1192914285
##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeResourceChecker.java:
##########
@@ -174,6 +174,19 @@ private void addDirToCheck(URI directoryToCheck, boolean
required)
* otherwise.
*/
public boolean hasAvailableDiskSpace() {
+ try {
+ if (minimumRedundantVolumes > volumes.size()){
+ throw new IllegalArgumentException("The value of "
+ + DFSConfigKeys.DFS_NAMENODE_CHECKED_VOLUMES_MINIMUM_KEY
+ + " is " + minimumRedundantVolumes
+ + " which is greater than the total number of existing storage volumes
"
+ + volumes.size() + " .");
+ }
+ } catch (IllegalArgumentException e){
+ LOG.warn("The value of " +
DFSConfigKeys.DFS_NAMENODE_CHECKED_VOLUMES_MINIMUM_KEY
+ + " is greater than the total number of existing storage volumes"
+ + " and will result in adding resources and still not being able to
turn off safe mode.", e);
+ }
return NameNodeResourcePolicy.areResourcesAvailable(volumes.values(),
minimumRedundantVolumes);
Review Comment:
minimumRedundantVolumes isn't always an issue if it is more than
volume.size()
If you go inside ``areResourcesAvailable``
this does return true
```
if (redundantResourceCount == 0) {
// If there are no redundant resources, return true if there are any
// required resources available.
return requiredResourceCount > 0;
}
```
When there is no redundant resource irrespective of
``minimumRedundantVolumes`` value
Second, if
```
// - during startup, if there are no edits dirs on disk, then there is
// a call to areResourcesAvailable() with no dirs at all, which was
// previously causing the NN to enter safemode
if (resources.isEmpty()) {
return true;
}
```
Any place where a log line can be added is here, and that too if it is
``false``, telling about all these numbers + the total number of values
```
} else {
return redundantResourceCount - disabledRedundantResourceCount >=
minimumRedundantResources;
}
```
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