johnyangk commented on a change in pull request #122: [NEMO-213] Use Beam's
DoFnRunners to execute DoFn
URL: https://github.com/apache/incubator-nemo/pull/122#discussion_r223652673
##########
File path:
compiler/frontend/beam/src/main/java/org/apache/nemo/compiler/frontend/beam/BeamKeyExtractor.java
##########
@@ -25,12 +26,19 @@
final class BeamKeyExtractor implements KeyExtractor {
@Override
public Object extractKey(final Object element) {
- if (element instanceof KV) {
- // Handle null keys, since Beam allows KV with null keys.
- final Object key = ((KV) element).getKey();
- return key == null ? 0 : key;
- } else {
- return element;
+ // TODO #: do not dynamically check the types for performance improvement
Review comment:
Remove? - I don't think we can avoid dynamic checking as the runtime is
agnostic to key types. Also maybe JVM branch prediction helps us here regarding
performance.
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