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Posted to issues@zookeeper.apache.org by "Yauheni Salopiy (JIRA)" <ji...@apache.org> on 2019/07/15 12:19:00 UTC
[jira] [Comment Edited] (ZOOKEEPER-1875) NullPointerException in
ClientCnxn$EventThread.processEvent
[ https://issues.apache.org/jira/browse/ZOOKEEPER-1875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16885139#comment-16885139 ]
Yauheni Salopiy edited comment on ZOOKEEPER-1875 at 7/15/19 12:18 PM:
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Hi guys,
[~jerryhe], [~zookeeper], is this Jira planned to be included in the next releases - [3.6.0|https://issues.apache.org/jira/issues/?jql=project+%3D+ZOOKEEPER+AND+fixVersion+%3D+3.6.0], [3.5.6|https://issues.apache.org/jira/issues/?jql=project+%3D+ZOOKEEPER+AND+fixVersion+%3D+3.5.6]?
Best Regards,
Yauheni Salopiy
was (Author: genstr):
Hi guys,
[~jerryhe], [~zookeeper], is this Jira planned to be included in the next releases - [3.6.0|https://issues.apache.org/jira/issues/?jql=project+%3D+ZOOKEEPER+AND+fixVersion+%3D+3.6.0], [3.5.6|https://issues.apache.org/jira/issues/?jql=project+%3D+ZOOKEEPER+AND+fixVersion+%3D+3.5.6]?
In my opinion, this is pretty severe issue and should have different than "minor" priority since it may cause clients to wait for ZooKeeper Server response indefinetly.
Best Regards,
Yauheni Salopiy
> NullPointerException in ClientCnxn$EventThread.processEvent
> -----------------------------------------------------------
>
> Key: ZOOKEEPER-1875
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1875
> Project: ZooKeeper
> Issue Type: Bug
> Components: java client
> Affects Versions: 3.4.5, 3.4.10
> Reporter: Jerry He
> Assignee: Jerry He
> Priority: Minor
> Fix For: 3.6.0, 3.5.6
>
> Attachments: ZOOKEEPER-1875-trunk.patch, ZOOKEEPER-1875.patch, ZOOKEEPER-1875.patch
>
>
> We've been seeing NullPointerException while working on HBase:
> {code}
> 14/01/30 22:15:25 INFO zookeeper.ZooKeeper: Client environment:user.dir=/home/biadmin/hbase-trunk
> 14/01/30 22:15:25 INFO zookeeper.ZooKeeper: Initiating client connection, connectString=hdtest009:2181 sessionTimeout=90000 watcher=null
> 14/01/30 22:15:25 INFO zookeeper.ClientCnxn: Opening socket connection to server hdtest009/9.30.194.18:2181. Will not attempt to authenticate using SASL (Unable to locate a login configuration)
> 14/01/30 22:15:25 INFO zookeeper.ClientCnxn: Socket connection established to hdtest009/9.30.194.18:2181, initiating session
> 14/01/30 22:15:25 INFO zookeeper.ClientCnxn: Session establishment complete on server hdtest009/9.30.194.18:2181, sessionid = 0x143986213e67e48, negotiated timeout = 60000
> 14/01/30 22:15:25 ERROR zookeeper.ClientCnxn: Error while calling watcher
> java.lang.NullPointerException
> at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:519)
> at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:495)
> {code}
> The reason is the watcher is null in this part of the code:
> {code}
> private void processEvent(Object event) {
> try {
> if (event instanceof WatcherSetEventPair) {
> // each watcher will process the event
> WatcherSetEventPair pair = (WatcherSetEventPair) event;
> for (Watcher watcher : pair.watchers) {
> try {
> watcher.process(pair.event);
> } catch (Throwable t) {
> LOG.error("Error while calling watcher ", t);
> }
> }
> {code}
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