danny0405 commented on code in PR #18988:
URL: https://github.com/apache/hudi/pull/18988#discussion_r3670392198
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hudi-client/hudi-client-common/src/main/java/org/apache/hudi/callback/common/HoodieWriteCommitCallbackMessage.java:
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@@ -69,10 +72,106 @@ public class HoodieWriteCommitCallbackMessage implements
Serializable {
*/
private final Option<Map<String, String>> extraMetadata;
+ /**
+ * Previous base file paths keyed by fileId, resolved lazily. Populated by
the write
+ * client from the cached FileSystemView so that callback implementations
don't have to
+ * rebuild a view. Empty for inserts and for callers that don't pre-resolve.
+ *
+ * <p>Resolution is deferred to the {@code prevFilePathsSupplier} and only
triggered on the
+ * first {@link #getPrevFilePaths()} call: a callback that never reads the
previous paths
+ * pays nothing (no FileSystemView access). The resolved value is memoized
here and is the
+ * form that gets serialized (see {@link #writeObject}).
+ */
+ private Map<String, PrevFilePaths> prevFilePaths;
+
+ /**
+ * Lazily resolves {@link #prevFilePaths}. Transient because it may capture a
+ * FileSystemView (not serializable); excluded from the generated getters so
it never
+ * leaks into JSON/Java serialization. The resolved map is memoized into
+ * {@link #prevFilePaths}.
+ */
+ @Getter(AccessLevel.NONE)
+ private final transient Supplier<Map<String, PrevFilePaths>>
prevFilePathsSupplier;
Review Comment:
do you think we can wrap the supplier with
`org.apache.hudi.common.util.Lazy` so that we can get rid of the redundant
`prevFilePaths`.
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