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Posted to user@zookeeper.apache.org by Benjamin Jaton <be...@gmail.com> on 2016/06/23 17:36:57 UTC

The current epoch, 1, is older than the last zxid, 8589935882

Hello, I am running 3.5.0-alpha (1 node) and I sometimes have those:

2016-06-23T00:12:23,642 [myid:1] - FATAL
[Thread-2:ZooKeeperServerWrapper$2@271] - ZK server thread has exited with
an exception
java.lang.RuntimeException: Unable to run quorum server
    at
org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:769)
~[zookeeper-3.5.0-alpha.jar:?]
    at
org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:718)
~[zookeeper-3.5.0-alpha.jar:?]
    at
org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:183)
~[zookeeper-3.5.0-alpha.jar:?]
    at
org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:120)
~[zookeeper-3.5.0-alpha.jar:?]
    at
org.apache.zookeeper.server.quorum.RLIQuorumPeerMain.main(RLIQuorumPeerMain.java:20)
~[rli_shared.jar:?]
Caused by: java.io.IOException: The current epoch, 1, is older than the
last zxid, 8589935882
    at
org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:750)
~[zookeeper-3.5.0-alpha.jar:?]
    ... 5 more

I think it happens after a restart of the machine.

I have noticed
https://issues.apache.org/jira/browse/ZOOKEEPER-1653
https://issues.apache.org/jira/browse/ZOOKEEPER-1747
but those are for 3.4

Then I see this one:
https://issues.apache.org/jira/browse/ZOOKEEPER-1549
which seems to be for the 3.5 branch.

Is it correct that ZOOKEEPER-1549 this can happen with a single node?

Thanks
Benjamin

Re: The current epoch, 1, is older than the last zxid, 8589935882

Posted by Patrick Hunt <ph...@apache.org>.
On Thu, Jun 23, 2016 at 10:36 AM, Benjamin Jaton <be...@gmail.com>
wrote:

> Hello, I am running 3.5.0-alpha (1 node) and I sometimes have those:
>
> 2016-06-23T00:12:23,642 [myid:1] - FATAL
> [Thread-2:ZooKeeperServerWrapper$2@271] - ZK server thread has exited with
> an exception
> java.lang.RuntimeException: Unable to run quorum server
>     at
>
> org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:769)
> ~[zookeeper-3.5.0-alpha.jar:?]
>     at
> org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:718)
> ~[zookeeper-3.5.0-alpha.jar:?]
>     at
>
> org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:183)
> ~[zookeeper-3.5.0-alpha.jar:?]
>     at
>
> org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:120)
> ~[zookeeper-3.5.0-alpha.jar:?]
>     at
>
> org.apache.zookeeper.server.quorum.RLIQuorumPeerMain.main(RLIQuorumPeerMain.java:20)
> ~[rli_shared.jar:?]
> Caused by: java.io.IOException: The current epoch, 1, is older than the
> last zxid, 8589935882
>     at
>
> org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:750)
> ~[zookeeper-3.5.0-alpha.jar:?]
>     ... 5 more
>
> I think it happens after a restart of the machine.
>
> I have noticed
> https://issues.apache.org/jira/browse/ZOOKEEPER-1653
> https://issues.apache.org/jira/browse/ZOOKEEPER-1747
> but those are for 3.4
>
> Then I see this one:
> https://issues.apache.org/jira/browse/ZOOKEEPER-1549
> which seems to be for the 3.5 branch.
>
> Is it correct that ZOOKEEPER-1549 this can happen with a single node?


I don't believe so, 1549 is only when the ensemble size is larger than 1.

Are you only seeing this with 3.5.x? Not with 3.4.x I mean.

Patrick