snleee commented on a change in pull request #7662:
URL: https://github.com/apache/pinot/pull/7662#discussion_r739905378
##########
File path:
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/PinotHelixResourceManager.java
##########
@@ -2907,6 +2907,88 @@ 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) {
+ try {
+ DEFAULT_RETRY_POLICY.attempt(() -> {
+ // Fetch the segment lineage metadata
+ ZNRecord segmentLineageZNRecord =
+
SegmentLineageAccessHelper.getSegmentLineageZNRecord(_propertyStore,
tableNameWithType);
+ SegmentLineage segmentLineage;
+ int expectedVersion = -1;
+ Preconditions.checkArgument(segmentLineageZNRecord != null, String
+ .format("Segment lineage does not exist. (tableNameWithType =
'%s', segmentLineageEntryId = '%s')",
+ tableNameWithType, segmentLineageEntryId));
+ segmentLineage = SegmentLineage.fromZNRecord(segmentLineageZNRecord);
+ 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));
+
+ // Revert is not allowed if the state is not 'COMPLETED'
+ if (lineageEntry.getState() != LineageEntryState.COMPLETED) {
+ LOGGER.warn("Lineage entry state is not COMPLETED. Cannot revert the
lineage entry. (tableNameWithType={}, "
+ + "segmentLineageEntryId={})", tableNameWithType,
segmentLineageEntryId);
+ return false;
+ }
+
+ // Check that all the segments from 'segmentsFrom' exist in the table
+ Set<String> segmentsForTable = new
HashSet<>(getSegmentsFor(tableNameWithType));
+
Preconditions.checkArgument(segmentsForTable.containsAll(lineageEntry.getSegmentsFrom()),
String.format(
+ "Not all segments from 'segmentsFrom' are available in the table.
(tableName = '%s', segmentsFrom = '%s', "
+ + "segmentsForTable = '%s')", tableNameWithType,
lineageEntry.getSegmentsFrom(), segmentsForTable));
+
+ // Check that all segments from 'segmentsFrom' are in ONLINE state in
the external view.
+ Set<String> onlineSegments =
getOnlineSegmentsFromExternalView(tableNameWithType);
+
Preconditions.checkArgument(onlineSegments.containsAll(lineageEntry.getSegmentsFrom()),
String.format(
+ "Not all segments from 'segmentFrom' are in ONLINE state in the
external view. (tableName = '%s', "
+ + "segmentsFrom = '%s', onlineSegments = '%s'",
tableNameWithType, lineageEntry.getSegmentsFrom(),
+ segmentsForTable));
Review comment:
Thanks. I also found this. Fixed now.
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