stevenzwu commented on code in PR #4943:
URL: https://github.com/apache/iceberg/pull/4943#discussion_r889713393


##########
flink/v1.15/flink/src/main/java/org/apache/iceberg/flink/source/StreamingMonitorFunction.java:
##########
@@ -134,15 +140,33 @@ public void snapshotState(FunctionSnapshotContext 
context) throws Exception {
   public void run(SourceContext<FlinkInputSplit> ctx) throws Exception {
     this.sourceContext = ctx;
     while (isRunning) {
+      LOG.debug("Start polling snapshots from snapshot id: {}, 
max-snapshots-per-monitor-interval: {}", lastSnapshotId,
+          scanContext.maxSnapshotsPerMonitorInterval());
+      long start = System.currentTimeMillis();
+      long startSnapshotId = lastSnapshotId;
       synchronized (sourceContext.getCheckpointLock()) {
         if (isRunning) {
           monitorAndForwardSplits();
         }
       }
+      LOG.debug("Forwarded splits from {}(exclusive) to {}(inclusive), time 
elapsed {}ms",

Review Comment:
   The logging seems wrong to me. both `startSnapshotId` and `lastSnapshotId` 
are pointing to the same snapshotId. Moving the logging inside 
`maxReachableSnapshotId`, we can correctly apply the endSnapshotId calculated 
from `maxReachableSnapshotId`.



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