# org.apache.kafka.common.errors.ReassignmentInProgressException: No reassignment in progress for partition my_topic-0

- **ID:** `kafka/no-reassignment-in-progress`
- **Domain:** kafka
- **Category:** runtime_error
- **Verification:** ai_generated
- **Fix Rate:** 88%

## Root Cause

Admin client attempted to cancel or alter a partition reassignment that does not exist or has already completed, due to stale metadata or incorrect partition identifier.

## Workarounds

1. **First, verify the current reassignment status using `kafka-reassign-partitions.sh --bootstrap-server localhost:9092 --verify --reassignment-json-file reassign.json`. If completed, no further action needed.** (95% success)
   ```
   First, verify the current reassignment status using `kafka-reassign-partitions.sh --bootstrap-server localhost:9092 --verify --reassignment-json-file reassign.json`. If completed, no further action needed.
   ```
2. **If the reassignment never started due to a previous error, re-submit the reassignment JSON using `kafka-reassign-partitions.sh --execute` with the correct partition list.** (85% success)
   ```
   If the reassignment never started due to a previous error, re-submit the reassignment JSON using `kafka-reassign-partitions.sh --execute` with the correct partition list.
   ```
3. **Use the AdminClient API: `adminClient.listPartitionReassignments().all().get()` to check active reassignments before attempting cancel. Example Java code: `ListPartitionReassignmentsResult result = adminClient.listPartitionReassignments();`** (90% success)
   ```
   Use the AdminClient API: `adminClient.listPartitionReassignments().all().get()` to check active reassignments before attempting cancel. Example Java code: `ListPartitionReassignmentsResult result = adminClient.listPartitionReassignments();`
   ```

## Dead Ends

- **** — If the reassignment is already complete, retrying the same cancel will always fail because there is no in-progress reassignment. (90% fail)
- **** — In modern Kafka (2.6+), reassignments are tracked via the 'reassign_partitions' topic; deleting ZK nodes is ineffective and may cause corruption. (70% fail)
- **** — Restarting a broker does not affect the reassignment state; the admin client will still see no in-progress reassignment. (80% fail)