Learn how to fix the “ERR DUMP Payload Version or Checksum Are Wrong” Error in Redis. Our Redis Support team is ready to assist.
How to Fix the “ERR DUMP Payload Version or Checksum Are Wrong” Error in Redis
When working with Redis, especially during backup and restore operations, you may have come across this frustrating error:
ERR DUMP payload version or checksum are wrong
This message typically appears when using the `RESTORE` command to import data, and it signifies either corruption in the DUMP payload or a version mismatch between Redis instances. In this guide, we’ll break down the causes, how to fix them, and how to prevent this error in the future.
An Overview:
- What Causes the “ERR DUMP Payload Version or Checksum Are Wrong” Error?
- How the Error Appears
- Impacts of the Error
- How to Fix the Error
- 1. Fix Data Corruption During Transfer
- 2. Match RDB Versions Between Redis Instances
- 3. Avoid Improper Use of the `-x` Flag
- 4. Resolve Encoding Issues
- 5. Fix Checksum Mismatch
- 6. Handle Redis Cluster Context Correctly
- 7. Ensure Adequate Memory Availability
- Prevention Tips
What Causes the “ERR DUMP Payload Version or Checksum Are Wrong” Error?
This error occurs when Redis fails to verify the integrity of the DUMP file. Here are some of the possible causes:
- The DUMP file was corrupted during transfer.
- There is an incompatible RDB version between the source and destination Redis instances.
- Incorrect command-line syntax.
- Shells or encodings are altering binary data.
- There’s a checksum mismatch.
- We may be restoring in a Redis Cluster without proper context.
- There are memory limitations on the destination instance.
How the Error Appears
The error usually appears during the `RESTORE` operation, like this:
redis-cli -x restore test1 0 < /tmp/test.dump
(error) ERR DUMP payload version or checksum are wrong
If you’re using authentication to connect to remote Redis servers, make sure you’re using the correct syntax with password authentication. Here’s a helpful guide to connecting Redis CLI to a remote server with a password.
Impacts of the Error
- Failed RESTORE operations.
- Service interruptions during disaster recovery.
- Data inconsistency in clustered environments.
Security risks arise when errors are overlooked during automated processes.
How to Fix the Error
1. Fix Data Corruption During Transfer
Data corruption often occurs if binary dump files are manipulated by shell utilities like `head`, `tr`, or incorrect redirect operators.
Click here for the Solution.
Use scripting languages that handle binary data correctly.
Here is a Python example:
import redis
# On source machine
r = redis.Redis(host='source_host', port=6379)
data = r.dump('key_to_backup')
with open('dump.rdb', 'wb') as f:
f.write(data)
Then, transfer it securely using `scp`, and restore on the destination:
# On destination machine
r = redis.Redis(host='destination_host', port=6379)
with open('dump.rdb', 'rb') as f:
data = f.read()
r.restore('key_to_restore', 0, data)
If you’re working with Python, you might also want to consider setting expiration times during HSET operations. Here’s how to do that in Python with Redis using HSET and expiration time.
2. Match RDB Versions Between Redis Instances
The dump was created with a newer Redis version than the one used to restore.
Click here for the Solution.
Ensure both instances use compatible Redis versions.
We can check the version with this command:
redis-cli info | grep redis_versionIf the source version is newer, we need to upgrade the Redis instance on the destination server.
Also, if you’re evaluating your Redis deployment, it’s worth reviewing Redis cache alternatives to ensure you’re using the right solution for your architecture.
3. Avoid Improper Use of the `-x` Flag
`redis-cli -x` may not properly handle binary data in DUMP payloads.
Click here for the Solution.
Use `cat` to pipe the file, or use the Redis prompt directly.
cat /tmp/test.dump | redis-cli -h 127.0.0.1 -p 6379 restore test1 0Or connect manually:
redis-cli -h 127.0.0.1 -p 6379
127.0.0.1:6379> restore test1 0 "\x00\xc0\n..."
4. Resolve Encoding Issues
Shells may misinterpret binary data due to locale settings.
Click here for the Solution.
Set the locale to `C` when working with binary files:
LC_ALL=C cat dump.rdb | redis-cli -x restore test1 0Or even better, handle binary data using scripting languages.
5. Fix Checksum Mismatch
File integrity is compromised during file creation or transfer.
Click here for the Solution.
- Regenerate the DUMP file from the source.
- Use `scp` for secure transfer.
- Verify integrity with checksums:
sha256sum dump.rdb
6. Handle Redis Cluster Context Correctly
`RESTORE` fails if not executed on the correct cluster node.
Click here for the Solution.
- Use `redis-cli -c` to enable cluster mode.
- Connect directly to the responsible node for the key slot.
If you’re restoring to a managed Redis service like AWS ElastiCache, you should also understand how its eviction policies can impact performance. Here’s a great resource on ElastiCache Redis eviction policies.
7. Ensure Adequate Memory Availability
Redis may not have enough memory to restore large keys.
Click here for the Solution.
- Check memory usage:
redis-cli info memory - Update `redis.conf`:
maxmemory 4gb - Restart Redis and retry the `RESTORE` operation.
Also, consider optimizing your Redis setup with SSD emulation in Proxmox if using virtualized environments.
Additionally, we can optimize the Redis setup with SSD emulation in Proxmox when using virtualized environments.
Prevention Tips
- Use secure, binary-safe tools like Python or `scp’.
- Keep Redis versions consistent across environments.
- Verify checksums after every transfer.
- Monitor memory usage regularly.
- Enable Redis security features like authentication and TLS.
- Configure robust backup and disaster recovery systems.
[Need assistance with a different issue? Our team is available 24/7.]
Conclusion
In short, our Support Engineers demonstrated how to fix the “ERR DUMP Payload Version or Checksum Are Wrong” Error in Redis.
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