CODEWITHSUNDEEP
c++apache-zookeeper
Jacobian
Jacobian

Reputation: 10812

Persistent and ephemeral nodes in ZooKeeper

I want to know how to create persistent nodes in ZooKeeper, using C++ client. I know from documentation, that there is a method zoo_acreate. And documentation says about this method that:

This method will create a node in ZooKeeper. A node can only be created if it does not already exists. The Create Flags affect the creation of nodes. If ZOO_EPHEMERAL flag is set, the node will automatically get removed if the client session goes away. If the ZOO_SEQUENCE flag is set, a unique monotonically increasing sequence number is appended to the path name.

But, unfortunatelly, almost as always with C++ libraries, this library completely lacks reasonable teeny-weeny examples demonstarting the usage of the library methods. As for example in this case where documentation page is about zoo_acreate method, but some terribly looking example is totally about something else (it does not even mention zoo_acreate method).

So, my question is how to set these flags ZOO_EPHEMERAL and ZOO_SEQUENCE. It would be great to see this in the context of some tiny examples. Thanks!

Upvotes: 0

Views: 1148

Answers (1)

Ross Bencina
Ross Bencina

Reputation: 4173

Googling for "zoo_acreate ZOO_EPHEMERAL" gave this as the seventh result:

string path = "/nodes/";
string value = "data";
int rc = zoo_acreate(zh, path.c_str(), value.c_str(), value.length(),
    &ZOO_OPEN_ACL_UNSAFE, ZOO_EPHEMERAL | ZOO_SEQUENCE, &czoo_created, &where);

Source: https://issues.apache.org/jira/browse/ZOOKEEPER-348

Upvotes: 1

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