[Bug] Batch Compaction error

### Search before asking

- [x] I searched in the [issues](https://github.com/apache/paimon/issues) and found nothing similar.

### Paimon version

Paimon 1.2.0

### Compute Engine

Flink 1.20.2
JAVA 11

### Minimal reproduce step

2026-01-05 19:28:18
org.apache.flink.runtime.JobException: Recovery is suppressed by NoRestartBackoffTimeStrategy
at org.apache.flink.runtime.executiongraph.failover.ExecutionFailureHandler.handleFailure(ExecutionFailureHandler.java:219)
at org.apache.flink.runtime.executiongraph.failover.ExecutionFailureHandler.handleFailureAndReport(ExecutionFailureHandler.java:166)
at org.apache.flink.runtime.executiongraph.failover.ExecutionFailureHandler.getFailureHandlingResult(ExecutionFailureHandler.java:121)
at org.apache.flink.runtime.scheduler.DefaultScheduler.recordTaskFailure(DefaultScheduler.java:281)
at org.apache.flink.runtime.scheduler.DefaultScheduler.handleTaskFailure(DefaultScheduler.java:272)
at org.apache.flink.runtime.scheduler.adaptivebatch.AdaptiveBatchScheduler.handleTaskFailure(AdaptiveBatchScheduler.java:413)
at org.apache.flink.runtime.scheduler.DefaultScheduler.onTaskFailed(DefaultScheduler.java:265)
at org.apache.flink.runtime.scheduler.adaptivebatch.AdaptiveBatchScheduler.onTaskFailed(AdaptiveBatchScheduler.java:405)
at org.apache.flink.runtime.scheduler.SchedulerBase.onTaskExecutionStateUpdate(SchedulerBase.java:788)
at org.apache.flink.runtime.scheduler.SchedulerBase.updateTaskExecutionState(SchedulerBase.java:765)
at org.apache.flink.runtime.scheduler.SchedulerNG.updateTaskExecutionState(SchedulerNG.java:83)
at org.apache.flink.runtime.jobmaster.JobMaster.updateTaskExecutionState(JobMaster.java:515)
at jdk.internal.reflect.GeneratedMethodAccessor913.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.flink.runtime.rpc.pekko.PekkoRpcActor.lambda$handleRpcInvocation$1(PekkoRpcActor.java:318)
at org.apache.flink.runtime.concurrent.ClassLoadingUtils.runWithContextClassLoader(ClassLoadingUtils.java:83)
at org.apache.flink.runtime.rpc.pekko.PekkoRpcActor.handleRpcInvocation(PekkoRpcActor.java:316)
at org.apache.flink.runtime.rpc.pekko.PekkoRpcActor.handleRpcMessage(PekkoRpcActor.java:229)
at org.apache.flink.runtime.rpc.pekko.FencedPekkoRpcActor.handleRpcMessage(FencedPekkoRpcActor.java:88)
at org.apache.flink.runtime.rpc.pekko.PekkoRpcActor.handleMessage(PekkoRpcActor.java:174)
at org.apache.pekko.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:33)
at org.apache.pekko.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:29)
at scala.PartialFunction.applyOrElse(PartialFunction.scala:127)
at scala.PartialFunction.applyOrElse$(PartialFunction.scala:126)
at org.apache.pekko.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:29)
at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:175)
at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:176)
at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:176)
at org.apache.pekko.actor.Actor.aroundReceive(Actor.scala:547)
at org.apache.pekko.actor.Actor.aroundReceive$(Actor.scala:545)
at org.apache.pekko.actor.AbstractActor.aroundReceive(AbstractActor.scala:229)
at org.apache.pekko.actor.ActorCell.receiveMessage(ActorCell.scala:590)
at org.apache.pekko.actor.ActorCell.invoke(ActorCell.scala:557)
at org.apache.pekko.dispatch.Mailbox.processMailbox(Mailbox.scala:272)
at org.apache.pekko.dispatch.Mailbox.run(Mailbox.scala:233)
at org.apache.pekko.dispatch.Mailbox.exec(Mailbox.scala:245)
at java.base/java.util.concurrent.ForkJoinTask.doExec(Unknown Source)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(Unknown Source)
at java.base/java.util.concurrent.ForkJoinPool.scan(Unknown Source)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)
Caused by: java.lang.RuntimeException: File deletion conflicts detected! Give up committing.

Don't panic!
Conflicts during commits are normal and this failure is intended to resolve the conflicts.
Conflicts are mainly caused by the following scenarios:
1. Multiple jobs are writing into the same partition at the same time, or you use STATEMENT SET to execute multiple INSERT statements into the same Paimon table.
You'll probably see different base commit user and current commit user below.
You can use https://paimon.apache.org/docs/master/maintenance/dedicated-compaction#dedicated-compaction-job to support multiple writing.
2. You're recovering from an old savepoint, or you're creating multiple jobs from a savepoint.
The job will fail continuously in this scenario to protect metadata from corruption.
You can either recover from the latest savepoint, or you can revert the table to the snapshot corresponding to the old savepoint.

Base commit user is: 8c4e22ba-1553-4021-bbee-944764ce41aa; Current commit user is: 0ac35332-87ee-4f0e-8143-f5dac9e6d523

Base entries are:
{kind=ADD, partition=org.apache.paimon.data.BinaryRow@acfb97e5, bucket=2, totalBuckets=12, level=0, fileName=data-100a0c06-cda9-4e1a-bada-23357869888a-0.parquet, extraFiles=[data-100a0c06-cda9-4e1a-bada-23357869888a-0.parquet.index], minKey=org.apache.paimon.data.BinaryRow@9c67b85d, maxKey=org.apache.paimon.data.BinaryRow@9c67b85d, externalPath=null}
{kind=ADD, partition=org.apache.paimon.data.BinaryRow@acfb97e5, bucket=8, totalBuckets=12, level=0, fileName=data-a8f1b651-8af1-40bb-a6e5-bd751e052fa3-0.parquet, extraFiles=[data-a8f1b651-8af1-40bb-a6e5-bd751e052fa3-0.parquet.index], minKey=org.apache.paimon.data.BinaryRow@9c67b85d, maxKey=org.apache.paimon.data.BinaryRow@9c67b85d, externalPath=null}
{kind=ADD, partition=org.apache.paimon.data.BinaryRow@acfb97e5, bucket=4, totalBuckets=12, level=0, fileName=data-ecb6d0c3-9423-4259-a919-cd150b9e8fea-0.parquet, extraFiles=[data-ecb6d0c3-9423-4259-a919-cd150b9e8fea-0.parquet.index], minKey=org.apache.paimon.data.BinaryRow@9c67b85d, maxKey=org.apache.paimon.data.BinaryRow@9c67b85d, externalPath=null}
{kind=ADD, partition=org.apache.paimon.data.BinaryRow@acfb97e5, bucket=10, totalBuckets=12, level=0, fileName=data-8bfad8ef-27aa-4293-8f38-5db74cd19ff4-0.parquet, extraFiles=[data-8bfad8ef-27aa-4293-8f38-5db74cd19ff4-0.parquet.index], minKey=org.apache.paimon.data.BinaryRow@9c67b85d, maxKey=org.apache.paimon.data.BinaryRow@9c67b85d, externalPath=null}
{kind=ADD, partition=org.apache.paimon.data.BinaryRow@acfb97e5, bucket=3, totalBuckets=12, level=0, fileName=data-405288e8-e636-46b7-a698-e08efd900df3-0.parquet, extraFiles=[data-405288e8-e636-46b7-a698-e08efd900df3-0.parquet.index], minKey=org.apache.paimon.data.BinaryRow@9c67b85d, maxKey=org.apache.paimon.data.BinaryRow@9c67b85d, externalPath=null}
{kind=ADD, partition=org.apache.paimon.data.BinaryRow@acfb97e5, bucket=9, totalBuckets=12, level=0, fileName=data-1315369e-a10d-4a5f-a087-b1c8c1f32ca7-0.parquet, extraFiles=[data-1315369e-a10d-4a5f-a087-b1c8c1f32ca7-0.parquet.index], minKey=org.apache.paimon.data.BinaryRow@9c67b85d, maxKey=org.apache.paimon.data.BinaryRow@9c67b85d, externalPath=null}

Changes are:
{kind=DELETE, partition=org.apache.paimon.data.BinaryRow@38567196, bucket=10, totalBuckets=12, level=0, fileName=data-f973d582-3a35-43e5-aed2-9c3af645bc6f-0.parquet, extraFiles=[data-f973d582-3a35-43e5-aed2-9c3af645bc6f-0.parquet.index], minKey=org.apache.paimon.data.BinaryRow@9c67b85d, maxKey=org.apache.paimon.data.BinaryRow@9c67b85d, externalPath=null}
{kind=DELETE, partition=org.apache.paimon.data.BinaryRow@38567196, bucket=10, totalBuckets=12, level=0, fileName=data-f973d582-3a35-43e5-aed2-9c3af645bc6f-1.parquet, extraFiles=[data-f973d582-3a35-43e5-aed2-9c3af645bc6f-1.parquet.index], minKey=org.apache.paimon.data.BinaryRow@9c67b85d, maxKey=org.apache.paimon.data.BinaryRow@9c67b85d, externalPath=null}
{kind=DELETE, partition=org.apache.paimon.data.BinaryRow@38567196, bucket=10, totalBuckets=12, level=0, fileName=data-f973d582-3a35-43e5-aed2-9c3af645bc6f-2.parquet, extraFiles=[data-f973d582-3a35-43e5-aed2-9c3af645bc6f-2.parquet.index], minKey=org.apache.paimon.data.BinaryRow@9c67b85d, maxKey=org.apache.paimon.data.BinaryRow@9c67b85d, externalPath=null}
{kind=DELETE, partition=org.apache.paimon.data.BinaryRow@38567196, bucket=10, totalBuckets=12, level=0, fileName=data-f973d582-3a35-43e5-aed2-9c3af645bc6f-3.parquet, extraFiles=[data-f973d582-3a35-43e5-aed2-9c3af645bc6f-3.parquet.index], minKey=org.apache.paimon.data.BinaryRow@9c67b85d, maxKey=org.apache.paimon.data.BinaryRow@9c67b85d, externalPath=null}
{kind=DELETE, partition=org.apache.paimon.data.BinaryRow@38567196, bucket=10, totalBuckets=12, level=0, fileName=data-f973d582-3a35-43e5-aed2-9c3af645bc6f-4.parquet, extraFiles=[data-f973d582-3a35-43e5-aed2-9c3af645bc6f-4.parquet.index], minKey=org.apache.paimon.data.BinaryRow@9c67b85d, maxKey=org.apache.paimon.data.BinaryRow@9c67b85d, externalPath=null}
{kind=ADD, partition=org.apache.paimon.data.BinaryRow@38567196, bucket=10, totalBuckets=12, level=0, fileName=data-7dd555aa-9eb0-4fcc-a68a-b9a22a769d8c-0.parquet, extraFiles=[data-7dd555aa-9eb0-4fcc-a68a-b9a22a769d8c-0.parquet.index], minKey=org.apache.paimon.data.BinaryRow@9c67b85d, maxKey=org.apache.paimon.data.BinaryRow@9c67b85d, externalPath=null}
{kind=ADD, partition=org.apache.paimon.data.BinaryRow@38567196, bucket=10, totalBuckets=12, level=0, fileName=data-7dd555aa-9eb0-4fcc-a68a-b9a22a769d8c-1.parquet, extraFiles=[data-7dd555aa-9eb0-4fcc-a68a-b9a22a769d8c-1.parquet.index], minKey=org.apache.paimon.data.BinaryRow@9c67b85d, maxKey=org.apache.paimon.data.BinaryRow@9c67b85d, externalPath=null}
{kind=DELETE, partition=org.apache.paimon.data.BinaryRow@faad274e, bucket=6, totalBuckets=12, level=0, fileName=data-ddb1f447-48a8-4b37-9174-1c7a6b725059-7.parquet, extraFiles=[data-ddb1f447-48a8-4b37-9174-1c7a6b725059-7.parquet.index], minKey=org.apache.paimon.data.BinaryRow@9c67b85d, maxKey=org.apache.paimon.data.BinaryRow@9c67b85d, externalPath=null}

The entry list above are not fully displayed, please refer to taskmanager.log for more information.
at org.apache.paimon.operation.FileStoreCommitImpl.createConflictException(FileStoreCommitImpl.java:1486)
at org.apache.paimon.operation.FileStoreCommitImpl.lambda$noConflictsOrFail$15(FileStoreCommitImpl.java:1314)
at org.apache.paimon.operation.FileStoreCommitImpl.noConflictsOrFail(FileStoreCommitImpl.java:1329)
at org.apache.paimon.operation.FileStoreCommitImpl.tryCommitOnce(FileStoreCommitImpl.java:964)
at org.apache.paimon.operation.FileStoreCommitImpl.tryCommit(FileStoreCommitImpl.java:782)
at org.apache.paimon.operation.FileStoreCommitImpl.commit(FileStoreCommitImpl.java:361)
at org.apache.paimon.table.sink.TableCommitImpl.commitMultiple(TableCommitImpl.java:217)
at org.apache.paimon.table.sink.TableCommitImpl.filterAndCommitMultiple(TableCommitImpl.java:256)
at org.apache.paimon.flink.sink.StoreCommitter.filterAndCommit(StoreCommitter.java:121)
at org.apache.paimon.flink.sink.CommitterOperator.commitUpToCheckpoint(CommitterOperator.java:213)
at org.apache.paimon.flink.sink.CommitterOperator.endInput(CommitterOperator.java:186)
at org.apache.flink.streaming.runtime.tasks.StreamOperatorWrapper.endOperatorInput(StreamOperatorWrapper.java:96)
at org.apache.flink.streaming.runtime.tasks.RegularOperatorChain.endInput(RegularOperatorChain.java:97)
at org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:68)
at org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:638)
at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:231)
at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:973)
at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:917)
at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:970)
at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:949)
at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:763)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:575)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalStateException: Trying to add file {partition=org.apache.paimon.data.BinaryRow@f459c4f, bucket=9, level=0, fileName=data-578040f5-8ea4-44a6-b100-ef64e07e0987-0.parquet, extraFiles=[data-578040f5-8ea4-44a6-b100-ef64e07e0987-0.parquet.index], embeddedIndex=null, externalPath=null} which is already added.
at org.apache.paimon.utils.Preconditions.checkState(Preconditions.java:204)
at org.apache.paimon.manifest.FileEntry.mergeEntries(FileEntry.java:193)
at org.apache.paimon.manifest.FileEntry.mergeEntries(FileEntry.java:175)
at org.apache.paimon.operation.FileStoreCommitImpl.noConflictsOrFail(FileStoreCommitImpl.java:1327)
... 20 more

### What doesn't meet your expectations?

Dedicated compaction job keeps failing at the last subtask.

Function call (same results for both CALLs)：
①tableEnv.executeSql("CALL sys.compact(" +
" `table` => '" + tableName + "', " +
" partitions => 'dt="+dt+"', " +
" compact_strategy => 'minor', " +
" options => 'target-file-size=128mb,sink.parallelism="+env.getParallelism()+"' " +
");");

②tableEnv.executeSql("CALL sys.compact(" +
" `table` => '" + tableName + "', " +
" compact_strategy => 'minor', " +
" partition_idle_time => '"+days+"d', " +
" options => 'target-file-size=128mb,sink.parallelism="+env.getParallelism()+"' " +
");");
0. BucketedAppendTable with OSS storage，
1. No other job is writing the table.
2. Some partition worked，but no new snapshot created (maybe no file meet the compaction condition?) .
3. Batch job started without savepoint.

### Anything else?

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

Start with taskmanager.log and FileStoreCommitImpl.java around lines 1314 and 1486, then trace the commit path through TableCommitImpl.java and StoreCommitter.java. Reproduce the batch compaction conflict using the reported Paimon 1.2.0 and Flink 1.20.2 setup. Done means the underlying conflict is explained and the batch compaction failure is addressed with regression coverage.

Written by the indexing model from the issue text.