What causes "Failed to get the write response" in apache/seatunnel?

Check the wrapped JedisException message for the actual server error (WRONGTYPE, OOM command not allowed, connection reset)

apache/seatunnel · error · RedisConnectorException

RedisErrorCode-03

RedisErrorCode-03

Error message

Failed to get the write response

What it means

Thrown by RedisSingleClient.processResponses after a pipelined batch write: each queued Response.get() may surface a JedisException (stored by the pipeline), and if any does, it is wrapped as RedisConnectorException with code GET_RESPONSE_FAILED. It means one or more commands in the batch write failed.

Source

Thrown at seatunnel-connectors-v2/connector-redis/src/main/java/org/apache/seatunnel/connectors/seatunnel/redis/client/RedisSingleClient.java:288

            String cursor, ScanParams scanParams, RedisDataType type) {

        if (type == null) {
            // redis 5
            return jedis.scan(cursor, scanParams);
        } else {
            // redis 7
            return jedis.scan(cursor, scanParams, type.name());
        }
    }

    private void processResponses(List<Response<?>> responseList) {
        try {
            for (Response<?> response : responseList) {
                // If the response is an exception object, it will be thrown
                response.get();
            }
        } catch (JedisException e) {
            throw new RedisConnectorException(RedisErrorCode.GET_RESPONSE_FAILED, e);
        }
    }
}

View on GitHub (pinned to cf67b549a7)

Solutions

Check the wrapped JedisException message for the actual server error (WRONGTYPE, OOM command not allowed, connection reset)
Fix key type conflicts — ensure existing keys match the target type or delete/flush conflicting keys before writing
Increase Redis maxmemory or add eviction policy if writes fail with OOM
Reduce pipeline batch size and socket timeouts to avoid timeouts on large batches
Verify network stability and Redis server logs for errors at the failure time

Defensive patterns

Strategy: try-catch

Validate before calling

// before batch write: check key type matches
String t = jedis.type(key);
if (!expectedType.equals(t) && !"none".equals(t)) { throw new IllegalStateException("WRONGTYPE for " + key); }

Try / catch

try { client.batchWriteHash(map); } catch (RedisConnectorException e) {
  if (e.getCause() instanceof JedisException je && je.getMessage().contains("WRONGTYPE")) { /* fix key type or rename keys */ }
  // OOM: reduce batch / raise maxmemory; connection: retry with backoff
}

Prevention

Check INFO memory / maxmemory before large bulk writes
Verify existing key types before writing (TYPE command)
Keep pipeline batches modest (hundreds, not tens of thousands)
Monitor Redis server logs and connection health

When it happens

Trigger: batchWriteString/batchWriteList/batchWriteSet/batchWriteHash/batchWriteZset call processResponses, and a pipelined command fails — connection dropped mid-pipeline, OOM on the server, WRONGTYPE, or read timeout on response.get().

Common situations: Redis server memory limit (maxmemory) rejecting writes; writing a value with the wrong type for an existing key (WRONGTYPE); network instability between the SeaTunnel worker and Redis; pipeline batches too large causing timeouts.

Related errors

AI-assisted analysis of apache/seatunnel@cf67b549a7 (2026-09-10). Data as JSON: /api/errors/0c3f254252188c94. Report an issue: GitHub.