jtao15 commented on a change in pull request #7662:
URL: https://github.com/apache/pinot/pull/7662#discussion_r740622112
##########
File path:
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/PinotHelixResourceManager.java
##########
@@ -2907,6 +2911,84 @@ public void endReplaceSegments(String tableNameWithType,
String segmentLineageEn
tableNameWithType, segmentLineageEntryId);
}
+ /**
+ * Revert the segment replacement
+ *
+ * 1. Compute validation
+ * 2. Update the lineage entry state to "REVERTED" and write metadata to the
property store
+ *
+ * Update is done with retry logic along with read-modify-write block for
achieving atomic update of the lineage
+ * metadata.
+ *
+ * @param tableNameWithType
+ * @param segmentLineageEntryId
+ */
+ public void revertReplaceSegments(String tableNameWithType, String
segmentLineageEntryId, boolean forceRevert) {
+ try {
+ DEFAULT_RETRY_POLICY.attempt(() -> {
+ // Fetch the segment lineage metadata
+ ZNRecord segmentLineageZNRecord =
+
SegmentLineageAccessHelper.getSegmentLineageZNRecord(_propertyStore,
tableNameWithType);
+ Preconditions.checkArgument(segmentLineageZNRecord != null, String
+ .format("Segment lineage does not exist. (tableNameWithType =
'%s', segmentLineageEntryId = '%s')",
+ tableNameWithType, segmentLineageEntryId));
+ SegmentLineage segmentLineage =
SegmentLineage.fromZNRecord(segmentLineageZNRecord);
+ int expectedVersion = segmentLineageZNRecord.getVersion();
+
+ // Look up the lineage entry based on the segment lineage entry id
+ LineageEntry lineageEntry =
segmentLineage.getLineageEntry(segmentLineageEntryId);
+ Preconditions.checkArgument(lineageEntry != null, String
+ .format("Invalid segment lineage entry id (tableName='%s',
segmentLineageEntryId='%s')", tableNameWithType,
+ segmentLineageEntryId));
+
+ if (lineageEntry.getState() != LineageEntryState.COMPLETED) {
+ // We do not allow to revert the lineage entry with 'REVERTED'
state. For 'IN_PROGRESS", we only allow to
+ // revert when 'forceRevert' is set to true.
+ if (lineageEntry.getState() != LineageEntryState.IN_PROGRESS ||
!forceRevert) {
Review comment:
Nit: this line can be merged with `L2944`?
```suggestion
if (lineageEntry.getState() == LineageEntryState.REVERTED ||
(lineageEntry.getState() == LineageEntryState.IN_PROGRESS && !forceRevert)) {
```
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