Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/795#discussion_r108051710
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/store/AbstractSchema.java ---
@@ -198,6 +200,10 @@ public Expression getExpression(SchemaPlus
parentSchema, String name) {
@Override
public boolean contentsHaveChangedSince(long lastCheck, long now) {
+ //use cached schema for 1 second, it will be helpful if it is highly
concurrent scenario
+ if( abs(now - lastCheck) < 1000 ) {
+ return false;
--- End diff --
Clearer would be:
```
return (now - lastCheck) < 1000;
```
And, the 1000 should be made into a constant:
```
public static int CACHED_SCHEMA_REFRESH_MS = 1000;
```
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