Operation type limitation in the Multi.

[sn00011]

First thanks for you fixes on the Multi, now I am using the new Multi and it works well. I have a little question though as I noticed the Multi only accepts four kinds of operations:

• CreateRequest
• SetDataRequest
• DeleteRequest
• CheckVersionRequest

Are there any special reason for this limitation?

I think in some cases, It would be nice to get a znode's stat change within a transaction. So if the Multi could accepts operations like GetData, Exists this could be easily done.

[samuel]

From what I understand of multi those are the only possible operations. Although, it's quite possible the set has been extended in later versions (3.5.x).

The java doc for multi: https://zookeeper.apache.org/doc/r3.4.3/api/org/apache/zookeeper/ZooKeeper.html#multi(java.lang.Iterable)

Possible zookeeper.Op classes: http://people.apache.org/~larsgeorge/zookeeper-1215258/build/docs/dev-api/org/apache/zookeeper/class-use/Op.html

[sn00011]

Then the operation types are restricted by the zookeeper itself. I found this line in the class org.apache.zookeeper.Op:

Represents a single operation in a multi-operation transaction. Each operation can be a create, update or delete or can just be a version check.

I found no other operation type support in later versions(> 3.4.3 && 3.5) as well. Thanks for pointing me a right direction.