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https://issues.apache.org/jira/browse/ZOOKEEPER-1495?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Edward Ribeiro updated ZOOKEEPER-1495:
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Attachment: (was: ZOOKEEPER-1495.2.patch)
> ZK client hangs when using a function not available on the server.
> ------------------------------------------------------------------
>
> Key: ZOOKEEPER-1495
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1495
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.4.2, 3.3.5
> Environment: all
> Reporter: nkeywal
> Assignee: nkeywal
> Priority: Minor
> Attachments: 1495.br33.v3.patch, ZOOKEEPER-1495.patch
>
>
> This happens for example when using zk#multi with a 3.4 client but a 3.3
> server.
> The issue seems to be on the server side: the servers drops the packets 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}
> The solution discussed in ZOOKEEPER-1381 would be to get an exception on the
> client side then & close the session.
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