Jedis to JedisCluster migration for AWS Elastic Cache

[Rajkumar Patange]

Hi Team,

Need input regarding JedisCluster, our old implementation was using Jedis Client which had inbuilt support for Transaction and Scan, we are migrating to AWS Elastic Cache which means we need to shift to JedisCluster(https://javadoc.io/doc/redis.clients/jedis/latest/redis/clients/jedis/JedisCluster.html) I need some reference related to JedisCluster support for Transaction & SCAN.

Thank you

[Sazzadul Hoque]

Hi Rajkumar Patange,

It is not possible to support Transaction in Cluster mode. But it is possible to do Transaction on a hashslot with very little extra work.

JedisCluster already supports SCAN by hashtag. Again, overall scan is not supported by Redis Cluster itself.

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[Rajkumar Patange]

Thanks for confirmation. The transaction implemented below way : 

Jedis jedisNodeConnection= jedisCluster.getConnectionFromSlot(JedisClusterCRC16.getSlot(hashKey(key)));
jedisNodeConnection.watch(hashKey(key));
Transaction transaction = jedisNodeConnection.multi();
transaction.set(hashKey(key), String.valueOf(item));
transaction.exec();
jedisNodeConnection.unwatch();
jedisNodeConnection.close();

Let me know if there is any better way.

[Sazzadul Hoque]

It's a good Transaction implementation.

My two cents:

- I don't see the necessity of Transaction for only one operation.

- UNWATCH is unnecessary after EXEC.

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[Rajkumar Patange]

Thanks. Removed unwatch.  Yes , the transaction is not required for one operation we have multiple operations this was an example snippet .