Fix Redis EXECABORT Transaction Discarded Error (2026)

The EXECABORT error means a Redis transaction was aborted because one of its commands failed.

This happens when you MULTI a series of commands, but one of them returns an error before EXEC is called. Redis then discards the entire transaction to prevent inconsistencies. The most common culprits are:

• Wrong data type for a command: You tried to use a command on a key that holds a different data type than expected. For example, running LPUSH on a key that already contains a string.

  • Diagnosis: Look at the command that failed in your client logs or Redis DEBUG OBJECT <key> output.
  • Fix: Ensure the key has the correct data type before executing the transaction. If it’s a string, use DEL <key> first. If it’s the wrong collection type, DEL <key> and re-create with the correct type.
  • Why it works: LPUSH requires a list, DEBUG OBJECT shows the current type, and DEL removes the key, allowing it to be recreated as the intended type.

• Key already exists/doesn’t exist when expected: Commands like SETNX (Set if Not Exists) or GET will fail if the key’s existence doesn’t match the command’s expectation.

  • Diagnosis: Check the exact command and the expected state of the key.
  • Fix: If the key must not exist, add a GET <key> before your MULTI block and check its result. If it returns nil, proceed with MULTI. If the key must exist, similarly check first. Alternatively, use commands that are more tolerant, like SET which overwrites.
  • Why it works: Proactively checking the key’s state prevents the transaction from hitting an unexpected condition.

• Syntax errors in commands: A typo in a command name or arguments within the MULTI block will cause it to fail immediately.

  • Diagnosis: Carefully review the command string sent to Redis.
  • Fix: Correct the syntax error in the command. For example, GETS should be GET.
  • Why it works: Redis parses commands before execution; a syntactically incorrect command cannot be parsed and thus fails.

• Command not found: Trying to use a command that isn’t available in your Redis version or has been disabled.

  • Diagnosis: Check redis-cli --help or the Redis documentation for the command’s availability.
  • Fix: Replace the non-existent command with an alternative or ensure your Redis instance is configured to allow it.
  • Why it works: Redis executes only known commands; unknown commands are immediately rejected.

• Argument count mismatch: Providing too many or too few arguments for a specific command. For instance, SET expects at least two arguments (key and value).

  • Diagnosis: Consult the Redis documentation for the specific command’s argument requirements.
  • Fix: Adjust the number of arguments to match the command’s signature. For SET, ensure you provide both a key and a value.
  • Why it works: Redis validates argument counts before command execution.

• Out of memory (OOM): If Redis runs out of memory during a transaction, commands that require memory allocation can fail.

  • Diagnosis: Check Redis logs for "OOM command not allowed when used memory > 'maxmemory'".
  • Fix: Increase maxmemory in redis.conf, or use maxmemory-policy like allkeys-lru to evict keys.
  • Why it works: Increasing maxmemory allows Redis to allocate more memory; eviction policies free up memory when it’s scarce.

• Lua script errors: If your transaction involves EVAL or EVALSHA, errors within the Lua script itself will abort the transaction.

  • Diagnosis: Redis will return a (error) ERR ... message indicating the Lua script error, often with a line number.
  • Fix: Debug and correct the Lua script. Ensure it handles all possible states and returns values as expected.
  • Why it works: Errors within the script prevent its successful execution, and by extension, the transaction.

The next error you’ll likely encounter if you haven’t addressed the underlying issue is a BUSYKEY Target key name already exists. error if you are attempting to overwrite a key that is locked or being used by another process.