zookeeper-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Alexander Shraer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-1807) Observers spam each other creating connections to the election addr
Date Fri, 01 Nov 2013 23:46:17 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-1807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13811771#comment-13811771
] 

Alexander Shraer commented on ZOOKEEPER-1807:
---------------------------------------------

Hi Raul,

ZK-107 allows changing server roles. In one config a server is an observer, in the next one
it may be a follower. I haven't looked closely, but I think the intention was to talk with
everyone you know to try to get the most up-to-date config information. Instead of reverting
this to the previous code, consider adding a check (regardless of whether this is an observer/participant
server) that won't attempt to create a connection if one is already there to the same server
with the same election address (election addresses may change from one view to the next).


The code should handle observer id > 0, please file a JIRA if you find that there is a
problem somewhere.

Thanks,
Alex



> Observers spam each other creating connections to the election addr
> -------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-1807
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1807
>             Project: ZooKeeper
>          Issue Type: Bug
>            Reporter: Raul Gutierrez Segales
>            Assignee: Raul Gutierrez Segales
>
> Hey [~shralex],
> I noticed today that my Observers are spamming each other trying to open connections
to the election port. I've got tons of these:
> {noformat}
> 2013-11-01 22:19:45,819 - DEBUG [WorkerSender[myid=13]] - There is a connection already
for server 9
> 2013-11-01 22:19:45,819 - DEBUG [WorkerSender[myid=13]] - There is a connection already
for server 10
> 2013-11-01 22:19:45,819 - DEBUG [WorkerSender[myid=13]] - There is a connection already
for server 6
> 2013-11-01 22:19:45,819 - DEBUG [WorkerSender[myid=13]] - There is a connection already
for server 12
> 2013-11-01 22:19:45,819 - DEBUG [WorkerSender[myid=13]] - There is a connection already
for server 14
> {noformat}
> and so and so on ad nauseam. 
> Now, looking around I found this inside FastLeaderElection.java from when you committed
ZOOKEEPER-107:
> {noformat}
>      private void sendNotifications() {
> -        for (QuorumServer server : self.getVotingView().values()) {
> -            long sid = server.id;
> -
> +        for (long sid : self.getAllKnownServerIds()) {
> +            QuorumVerifier qv = self.getQuorumVerifier();
> {noformat}
> Is that really desired? I suspect that is what's causing Observers to try to connect
to each other (as opposed as just connecting to participants). I'll give it a try now and
let you know. (Also, we use observer ids that are > 0, and I saw some parts of the code
that might not deal with that assumption - so it could be that too..). 



--
This message was sent by Atlassian JIRA
(v6.1#6144)

Mime
View raw message