pvary commented on a change in pull request #690: HIVE-21910: Multiple target
location generation in HostAffinitySplitLocationProvider
URL: https://github.com/apache/hive/pull/690#discussion_r298556011
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/exec/tez/HostAffinitySplitLocationProvider.java
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@@ -72,11 +78,17 @@ public HostAffinitySplitLocationProvider(List<String>
knownLocations) {
FileSplit fsplit = (FileSplit) split;
String splitDesc = "Split at " + fsplit.getPath() + " with offset= " +
fsplit.getStart()
+ ", length=" + fsplit.getLength();
- List<String> preferredLocations = preferLocations(fsplit);
- String location =
- preferredLocations.get(determineLocation(preferredLocations,
fsplit.getPath().toString(),
- fsplit.getStart(), splitDesc));
- return (location != null) ? new String[] { location } : null;
+ List<String> preferredLocations = new ArrayList<>(preferLocations(fsplit));
Review comment:
We might want to keep it configurable.
Until the cluster reaches the threshold where the highest loaded node starts
to struggle for resources keeping the tasks aligned with HDFS location still
makes sense.
What do you think?
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