jihoonson commented on a change in pull request #8038: Making optimal usage of
multiple segment cache locations
URL: https://github.com/apache/incubator-druid/pull/8038#discussion_r327466018
##########
File path:
server/src/main/java/org/apache/druid/segment/loading/SegmentLoaderConfig.java
##########
@@ -88,19 +92,32 @@ public int getNumBootstrapThreads()
return numBootstrapThreads == null ? numLoadingThreads :
numBootstrapThreads;
}
+ public StorageLocationSelectorStrategy
getStorageLocationSelectorStrategy(List<StorageLocation> storageLocations)
+ {
+ if (locationSelectorStrategy == null) {
+ checkLocationConfigForNull();
+ // default strategy if no strategy is specified in the config
+ locationSelectorStrategy = new
LeastBytesUsedStorageLocationSelectorStrategy(storageLocations);
+ }
+ return locationSelectorStrategy;
+ }
+
public File getInfoDir()
{
if (infoDir == null) {
-
- if (locations == null || locations.size() == 0) {
- throw new ISE("You have no segment cache locations defined. Please
configure druid.segmentCache.locations to use one or more locations.");
- }
+ checkLocationConfigForNull();
infoDir = new File(locations.get(0).getPath(), "info_dir");
}
-
return infoDir;
}
+ private void checkLocationConfigForNull()
Review comment:
You mean the below throws an error with a better message? The current error
message is like this:
```
2019-09-24T07:31:02,670 ERROR [main] org.apache.druid.cli.CliHistorical -
Error when starting up. Failing.
com.google.inject.ProvisionException: Unable to provision, see the following
errors:
1) druid.segmentCache.locations - may not be empty
...
It seems almost same to me.
```
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