[ 
https://issues.apache.org/jira/browse/HDDS-15209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18099961#comment-18099961
 ] 

Arun Sarin commented on HDDS-15209:
-----------------------------------

Superseding stale PR https://github.com/apache/ozone/pull/10363 (head 
arunsarin85:HDDS-15209 conflicted with master).

Follow-up / merge candidate: https://github.com/apache/ozone/pull/10890 
(jojochuang:HDDS-15209, rebased on master).

[Addresses review feedback: metadata-based diff oracle (buildNonDagMetadataDiff 
+ useCompactionDag=false cross-check), DAG subset filtering vs full-table DAG 
diff, SST backup assertions from first→last diff (no fixed SST ids/count), wait 
for inflight compactions, fail-fast on empty DAG diff Optional.]

Closing #10363 in favor of #10890 for review and merge.

Thanks.

> Intermittent NPE in TestRocksDBCheckpointDiffer
> -----------------------------------------------
>
>                 Key: HDDS-15209
>                 URL: https://issues.apache.org/jira/browse/HDDS-15209
>             Project: Apache Ozone
>          Issue Type: Sub-task
>          Components: test
>            Reporter: Attila Doroszlai
>            Assignee: Arun Sarin
>            Priority: Major
>              Labels: pull-request-available
>
> {code}
> Tests run: 54, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 16.26 s <<< 
> FAILURE! -- in org.apache.ozone.rocksdiff.TestRocksDBCheckpointDiffer
> org.apache.ozone.rocksdiff.TestRocksDBCheckpointDiffer.testDifferWithDB -- 
> Time elapsed: 1.910 s <<< ERROR!
> java.lang.NullPointerException: Cannot invoke 
> "org.apache.ozone.rocksdb.util.SstFileInfo.getColumnFamily()" because the 
> return value of 
> "org.apache.ozone.rocksdiff.DifferSnapshotInfo.getSstFile(int, String)" is 
> null
>       at 
> org.apache.ozone.rocksdiff.TestRocksDBCheckpointDiffer.diffAllSnapshots(TestRocksDBCheckpointDiffer.java:1052)
>       at 
> org.apache.ozone.rocksdiff.TestRocksDBCheckpointDiffer.testDifferWithDB(TestRocksDBCheckpointDiffer.java:983)
> {code}
> - 
> https://github.com/adoroszlai/ozone-build-results/blob/master/2026/05/05/48463/integration-ozone/hadoop-hdds/rocksdb-checkpoint-differ/org.apache.ozone.rocksdiff.TestRocksDBCheckpointDiffer.txt
> - 
> https://github.com/adoroszlai/ozone-build-results/blob/master/2026/05/07/48575/integration-ozone/hadoop-hdds/rocksdb-checkpoint-differ/org.apache.ozone.rocksdiff.TestRocksDBCheckpointDiffer.txt



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