[
https://issues.apache.org/jira/browse/ZOOKEEPER-1381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13294302#comment-13294302
]
nkeywal commented on ZOOKEEPER-1381:
------------------------------------
It's something I can reproduce using 'multi' on a 3.3 ZK server, for example
with this:
{noformat}
public void testMulti() throws Exception {
ZooKeeper zk = new ZooKeeper("127.0.0.1", 30000, null);
List<Op> ops = new ArrayList<Op>();
ops.add(Op.create("/m1", null, ZooDefs.Ids.OPEN_ACL_UNSAFE,
CreateMode.EPHEMERAL));
ops.add(Op.create("/m2", null, ZooDefs.Ids.OPEN_ACL_UNSAFE,
CreateMode.EPHEMERAL));
zk.multi(ops);
zk.close();
}
{noformat}
The issue seems to be on the server side, it drops the packet with an unknown
OpCode in ZooKeeperServer#submitRequest
{noformat}
public void submitRequest(Request si) {
// snip
try {
touch(si.cnxn);
boolean validpacket = Request.isValid(si.type); // ===> Check on
case OpCode.*
if (validpacket) {
// snip
} else {
LOG.warn("Dropping packet at server of type " + si.type);
// if invalid packet drop the packet.
}
} catch (MissingSessionException e) {
if (LOG.isDebugEnabled()) {
LOG.debug("Dropping request: " + e.getMessage());
}
}
}
{noformat}
> Add a method to get the zookeeper server version from the client
> ----------------------------------------------------------------
>
> Key: ZOOKEEPER-1381
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1381
> Project: ZooKeeper
> Issue Type: Improvement
> Components: c client, documentation, java client, server
> Affects Versions: 3.4.2
> Environment: all
> Reporter: nkeywal
> Priority: Minor
> Labels: newbie
>
> Zookeeper client API is designed to be server version agnostic as much as
> possible, so we can have new clients with old servers (or the opposite). But
> there is today no simple way for a client to know what's the server version.
> This would be very useful in order to;
> - check the compatibility (ex: 'multi' implementation available since 3.4
> while 3.4 clients API supports 3.3 servers as well)
> - have different implementation depending on the server functionalities
> A workaround (proposed by Mahadev Konar) is do "echo stat | nc hostname
> clientport" and parse the output to get the version. The output is, for
> example:
> -----------------------
> Zookeeper version: 3.4.2--1, built on 01/30/2012 17:43 GMT
> Clients:
> /127.0.0.1:54951[0](queued=0,recved=1,sent=0)
> Latency min/avg/max: 0/0/0
> Received: 1
> Sent: 0
> Outstanding: 0
> Zxid: 0x500000001
> Mode: follower
> Node count: 7
> --------------------
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
