danny0405 commented on code in PR #20499:
URL: https://github.com/apache/hudi/pull/20499#discussion_r4450416990
##########
hudi-flink-datasource/hudi-flink/src/main/java/org/apache/hudi/metrics/FlinkHiveSyncMetrics.java:
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@@ -37,10 +41,24 @@
*
* <p>The breakdown of each sync, from the init duration to the schema evolved
count, is only
* registered when {@code
hoodie.datasource.hive_sync.detailed_metrics.enabled} is set.
+ *
+ * <p>Obtain an instance with {@link #register}. Flink keeps one coordinator
metric group per operator
+ * for the life of the job, but creates a new coordinator whenever it rebuilds
the execution graph,
+ * as the adaptive scheduler does on every restart and rescale. That group
ignores a metric registered
+ * under a name it already holds, so metrics owned by each coordinator would
stay frozen at the first
+ * coordinator's values. Every coordinator of the same operator in the same
job therefore shares one
+ * instance.
*/
public class FlinkHiveSyncMetrics extends HoodieFlinkMetrics {
private static final int HISTOGRAM_WINDOW_SIZE = 100;
+ /**
+ * The instance shared by the coordinators of each operator, keyed by job
and operator ID. Entries
+ * are never removed: a coordinator closing does not tell whether another
will replace it, and one
+ * small instance per Hudi write operator per job is all this holds.
+ */
+ private static final Map<String, FlinkHiveSyncMetrics> SHARED_METRICS = new
ConcurrentHashMap<>();
Review Comment:
+1
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