vmtuan12 opened a new issue, #15303:
URL: https://github.com/apache/iceberg/issues/15303
### Query engine
Flink 1.20.3, with iceberg 1.9.1
### Question
Hi, i am trying flink sink to iceberg, with iceberg table maintenance. This
is the code
```java
Map<String, String> jdbcProps = new HashMap<>();
jdbcProps.put("jdbc.user", "flink_iceberg_user");
jdbcProps.put("jdbc.password", "abc123xyz");
jdbcProps.put("flink-maintenance.lock.jdbc.init-lock-tables",
"true");
TriggerLockFactory lockFactory = new JdbcLockFactory(
"jdbc:postgresql://infradb.lab:6432/flink_iceberg",
"catalog.db.flink_test_upsert",
// String.format("%s.%s.%s", catalog.name(),
tableName.namespace().toString(), tableName.name()),
jdbcProps
);
TableMaintenance.forTable(env, tableLoader, lockFactory)
.uidSuffix("production-maintenance")
.rateLimit(Duration.ofMinutes(2))
.lockCheckDelay(Duration.ofSeconds(30))
.parallelism(1)
// Daily snapshot cleanup
.add(ExpireSnapshots.builder()
.scheduleOnInterval(Duration.ofMinutes(2))
.maxSnapshotAge(Duration.ofMinutes(1))
.retainLast(1))
.append();
```
The lock remover fails
<img width="511" height="161" alt="Image"
src="https://github.com/user-attachments/assets/bd171419-a240-4d4e-a0d9-65b2b98ff4c9";
/>
Here are the logs
```
2026-02-12 09:03:12,017 WARN org.apache.flink.runtime.taskmanager.Task
[] - Lock remover (1/1)#1
(6f4d0d2882e73707370f0e74a31726a1_dc86d19e01b4aea788129c99f78947ac_0_1)
switched from RUNNING to FAILED with failure cause:
java.lang.NullPointerException: null
at
org.apache.iceberg.flink.maintenance.api.JdbcLockFactory$JdbcLock.instanceId(JdbcLockFactory.java:284)
~[iceberg-flink-runtime-1.20-1.9.1.jar:?]
at
org.apache.iceberg.flink.maintenance.api.JdbcLockFactory$JdbcLock.unlock(JdbcLockFactory.java:243)
~[iceberg-flink-runtime-1.20-1.9.1.jar:?]
at
org.apache.iceberg.flink.maintenance.operator.LockRemover.processWatermark(LockRemover.java:155)
~[iceberg-flink-runtime-1.20-1.9.1.jar:?]
at
org.apache.flink.streaming.runtime.tasks.OneInputStreamTask$StreamTaskNetworkOutput.emitWatermark(OneInputStreamTask.java:244)
~[flink-dist-1.20.3.jar:1.20.3]
at
org.apache.flink.streaming.runtime.watermarkstatus.StatusWatermarkValve.findAndOutputNewMinWatermarkAcrossAlignedSubpartitions(StatusWatermarkValve.java:283)
~[flink-dist-1.20.3.jar:1.20.3]
at
org.apache.flink.streaming.runtime.watermarkstatus.StatusWatermarkValve.inputWatermark(StatusWatermarkValve.java:184)
~[flink-dist-1.20.3.jar:1.20.3]
at
org.apache.flink.streaming.runtime.io.AbstractStreamTaskNetworkInput.processElement(AbstractStreamTaskNetworkInput.java:160)
~[flink-dist-1.20.3.jar:1.20.3]
at
org.apache.flink.streaming.runtime.io.AbstractStreamTaskNetworkInput.emitNext(AbstractStreamTaskNetworkInput.java:114)
~[flink-dist-1.20.3.jar:1.20.3]
at
org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:65)
~[flink-dist-1.20.3.jar:1.20.3]
at
org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:638)
~[flink-dist-1.20.3.jar:1.20.3]
at
org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:231)
~[flink-dist-1.20.3.jar:1.20.3]
at
org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:973)
~[flink-dist-1.20.3.jar:1.20.3]
at
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:917)
~[flink-dist-1.20.3.jar:1.20.3]
at
org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:970)
~[flink-dist-1.20.3.jar:1.20.3]
at
org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:949)
[flink-dist-1.20.3.jar:1.20.3]
at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:763)
[flink-dist-1.20.3.jar:1.20.3]
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:575)
[flink-dist-1.20.3.jar:1.20.3]
at java.base/java.lang.Thread.run(Unknown Source) [?:?]
```
Can anyone tell me what's wrong? Thanks so much!
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