NPE on ClientCnxnSocketNetty on 3.5.3-BETA

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NPE on ClientCnxnSocketNetty on 3.5.3-BETA

Enrico Olivelli
Hi all,
I have hit this error during internal tests of my product. The problem is
not always reproducible

java.lang.NullPointerException
    at
org.apache.zookeeper.ClientCnxnSocketNetty.onClosing(ClientCnxnSocketNetty.java:206)
    at
org.apache.zookeeper.ClientCnxn$SendThread.close(ClientCnxn.java:1395)
    at org.apache.zookeeper.ClientCnxn.disconnect(ClientCnxn.java:1440)
    at org.apache.zookeeper.ClientCnxn.close(ClientCnxn.java:1467)
    at org.apache.zookeeper.ZooKeeper.close(ZooKeeper.java:1319)

I did not find any issue in JIRA related to this stacktrace

Does anyone ever hit this problem ?
Otherwise I will create a JIRA and start looking at the cause

Thanks
Enrico Olivelli
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Re: NPE on ClientCnxnSocketNetty on 3.5.3-BETA

Abraham Fine
Would you mind sharing which version of ZooKeeper you are using?

Thanks,
Abe

On Thu, Sep 7, 2017, at 06:59, Enrico Olivelli wrote:

> Hi all,
> I have hit this error during internal tests of my product. The problem is
> not always reproducible
>
> java.lang.NullPointerException
>     at
> org.apache.zookeeper.ClientCnxnSocketNetty.onClosing(ClientCnxnSocketNetty.java:206)
>     at
> org.apache.zookeeper.ClientCnxn$SendThread.close(ClientCnxn.java:1395)
>     at org.apache.zookeeper.ClientCnxn.disconnect(ClientCnxn.java:1440)
>     at org.apache.zookeeper.ClientCnxn.close(ClientCnxn.java:1467)
>     at org.apache.zookeeper.ZooKeeper.close(ZooKeeper.java:1319)
>
> I did not find any issue in JIRA related to this stacktrace
>
> Does anyone ever hit this problem ?
> Otherwise I will create a JIRA and start looking at the cause
>
> Thanks
> Enrico Olivelli
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Re: NPE on ClientCnxnSocketNetty on 3.5.3-BETA

Enrico Olivelli
3.5.3 Beta , my bad I have only written it in the subject
Thanks
Enrico

On gio 7 set 2017, 21:18 Abraham Fine <[hidden email]> wrote:

> Would you mind sharing which version of ZooKeeper you are using?
>
> Thanks,
> Abe
>
> On Thu, Sep 7, 2017, at 06:59, Enrico Olivelli wrote:
> > Hi all,
> > I have hit this error during internal tests of my product. The problem is
> > not always reproducible
> >
> > java.lang.NullPointerException
> >     at
> >
> org.apache.zookeeper.ClientCnxnSocketNetty.onClosing(ClientCnxnSocketNetty.java:206)
> >     at
> > org.apache.zookeeper.ClientCnxn$SendThread.close(ClientCnxn.java:1395)
> >     at org.apache.zookeeper.ClientCnxn.disconnect(ClientCnxn.java:1440)
> >     at org.apache.zookeeper.ClientCnxn.close(ClientCnxn.java:1467)
> >     at org.apache.zookeeper.ZooKeeper.close(ZooKeeper.java:1319)
> >
> > I did not find any issue in JIRA related to this stacktrace
> >
> > Does anyone ever hit this problem ?
> > Otherwise I will create a JIRA and start looking at the cause
> >
> > Thanks
> > Enrico Olivelli
>
--


-- Enrico Olivelli
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Re: NPE on ClientCnxnSocketNetty on 3.5.3-BETA

Abraham Fine
My fault, I should have read the subject. :)

I have an idea of what is causing this issue. Just out of curiosity,
besides the ugly stack trace, is this issue associated with any
unexpected behavior from zookeeper?

Thanks,
Abe

On Thu, Sep 7, 2017, at 12:47, Enrico Olivelli wrote:

> 3.5.3 Beta , my bad I have only written it in the subject
> Thanks
> Enrico
>
> On gio 7 set 2017, 21:18 Abraham Fine <[hidden email]> wrote:
>
> > Would you mind sharing which version of ZooKeeper you are using?
> >
> > Thanks,
> > Abe
> >
> > On Thu, Sep 7, 2017, at 06:59, Enrico Olivelli wrote:
> > > Hi all,
> > > I have hit this error during internal tests of my product. The problem is
> > > not always reproducible
> > >
> > > java.lang.NullPointerException
> > >     at
> > >
> > org.apache.zookeeper.ClientCnxnSocketNetty.onClosing(ClientCnxnSocketNetty.java:206)
> > >     at
> > > org.apache.zookeeper.ClientCnxn$SendThread.close(ClientCnxn.java:1395)
> > >     at org.apache.zookeeper.ClientCnxn.disconnect(ClientCnxn.java:1440)
> > >     at org.apache.zookeeper.ClientCnxn.close(ClientCnxn.java:1467)
> > >     at org.apache.zookeeper.ZooKeeper.close(ZooKeeper.java:1319)
> > >
> > > I did not find any issue in JIRA related to this stacktrace
> > >
> > > Does anyone ever hit this problem ?
> > > Otherwise I will create a JIRA and start looking at the cause
> > >
> > > Thanks
> > > Enrico Olivelli
> >
> --
>
>
> -- Enrico Olivelli
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Re: NPE on ClientCnxnSocketNetty on 3.5.3-BETA

Enrico Olivelli - Diennea
Il giorno gio, 07/09/2017 alle 15.36 -0700, Abraham Fine ha scritto:

My fault, I should have read the subject. :)

I have an idea of what is causing this issue. Just out of curiosity,
besides the ugly stack trace, is this issue associated with any
unexpected behavior from zookeeper?


Thank you Abraham for your quick response,

Honestly I do not know, it came out on unit tests only once and I do not have logs on the server side, sorry.
The test is about dealing with an expired session, something like:
- start a session
- create a new ZooKeeper with the same sessionid and password and close it -> the session expires
- close the session -> boom!

I saw it only once, and I have upgraded my env to zookeeper 3.5.3-BETA 2 months ago
It is a unit test so ZK server is running in the same JVM

Anyway IMHO this is a bad error and the client should not ever crash in spite of weird server side behavior
Do you think it is related to another reported issue ?

I can help on fixing it

Cheers
Enrico




Thanks,
Abe

On Thu, Sep 7, 2017, at 12:47, Enrico Olivelli wrote:


3.5.3 Beta , my bad I have only written it in the subject
Thanks
Enrico

On gio 7 set 2017, 21:18 Abraham Fine <[hidden email]<mailto:[hidden email]>> wrote:



Would you mind sharing which version of ZooKeeper you are using?

Thanks,
Abe

On Thu, Sep 7, 2017, at 06:59, Enrico Olivelli wrote:


Hi all,
I have hit this error during internal tests of my product. The problem is
not always reproducible

java.lang.NullPointerException
    at



org.apache.zookeeper.ClientCnxnSocketNetty.onClosing(ClientCnxnSocketNetty.java:206)


    at
org.apache.zookeeper.ClientCnxn$SendThread.close(ClientCnxn.java:1395)
    at org.apache.zookeeper.ClientCnxn.disconnect(ClientCnxn.java:1440)
    at org.apache.zookeeper.ClientCnxn.close(ClientCnxn.java:1467)
    at org.apache.zookeeper.ZooKeeper.close(ZooKeeper.java:1319)

I did not find any issue in JIRA related to this stacktrace

Does anyone ever hit this problem ?
Otherwise I will create a JIRA and start looking at the cause

Thanks
Enrico Olivelli





--


-- Enrico Olivelli


--

Enrico Olivelli Software Development Manager @Diennea Tel.: (+39) 0546 066100 - Int. 925 Viale G.Marconi 30/14 - 48018 Faenza (RA) MagNews - E-mail Marketing Solutions http://www.magnews.it Diennea - Digital Marketing Solutions http://www.diennea.com

________________________________

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Re: NPE on ClientCnxnSocketNetty on 3.5.3-BETA

Abraham Fine
Your instructions to reproduce the issue sound about right. There is a
variable that is initialized during session creation and read during
closing, I think we are running into a race here.

Feel free to create a JIRA for this issue or tell me if you would like
me to do it. Any additional insights that you could put in the JIRA
ticket would be appreciated. I don't know of any reported issue that
would be related, but I could be missing something.

Thanks,
Abe


On Fri, Sep 8, 2017, at 00:12, Enrico Olivelli - Diennea wrote:

> Il giorno gio, 07/09/2017 alle 15.36 -0700, Abraham Fine ha scritto:
>
> My fault, I should have read the subject. :)
>
> I have an idea of what is causing this issue. Just out of curiosity,
> besides the ugly stack trace, is this issue associated with any
> unexpected behavior from zookeeper?
>
>
> Thank you Abraham for your quick response,
>
> Honestly I do not know, it came out on unit tests only once and I do not
> have logs on the server side, sorry.
> The test is about dealing with an expired session, something like:
> - start a session
> - create a new ZooKeeper with the same sessionid and password and close
> it -> the session expires
> - close the session -> boom!
>
> I saw it only once, and I have upgraded my env to zookeeper 3.5.3-BETA 2
> months ago
> It is a unit test so ZK server is running in the same JVM
>
> Anyway IMHO this is a bad error and the client should not ever crash in
> spite of weird server side behavior
> Do you think it is related to another reported issue ?
>
> I can help on fixing it
>
> Cheers
> Enrico
>
>
>
>
> Thanks,
> Abe
>
> On Thu, Sep 7, 2017, at 12:47, Enrico Olivelli wrote:
>
>
> 3.5.3 Beta , my bad I have only written it in the subject
> Thanks
> Enrico
>
> On gio 7 set 2017, 21:18 Abraham Fine
> <[hidden email]<mailto:[hidden email]>> wrote:
>
>
>
> Would you mind sharing which version of ZooKeeper you are using?
>
> Thanks,
> Abe
>
> On Thu, Sep 7, 2017, at 06:59, Enrico Olivelli wrote:
>
>
> Hi all,
> I have hit this error during internal tests of my product. The problem is
> not always reproducible
>
> java.lang.NullPointerException
>     at
>
>
>
> org.apache.zookeeper.ClientCnxnSocketNetty.onClosing(ClientCnxnSocketNetty.java:206)
>
>
>     at
> org.apache.zookeeper.ClientCnxn$SendThread.close(ClientCnxn.java:1395)
>     at org.apache.zookeeper.ClientCnxn.disconnect(ClientCnxn.java:1440)
>     at org.apache.zookeeper.ClientCnxn.close(ClientCnxn.java:1467)
>     at org.apache.zookeeper.ZooKeeper.close(ZooKeeper.java:1319)
>
> I did not find any issue in JIRA related to this stacktrace
>
> Does anyone ever hit this problem ?
> Otherwise I will create a JIRA and start looking at the cause
>
> Thanks
> Enrico Olivelli
>
>
>
>
>
> --
>
>
> -- Enrico Olivelli
>
>
> --
>
> Enrico Olivelli Software Development Manager @Diennea Tel.: (+39) 0546
> 066100 - Int. 925 Viale G.Marconi 30/14 - 48018 Faenza (RA) MagNews -
> E-mail Marketing Solutions http://www.magnews.it Diennea - Digital
> Marketing Solutions http://www.diennea.com
>
> ________________________________
>
> Iscriviti alla nostra newsletter per rimanere aggiornato su digital ed
> email marketing! http://www.magnews.it/newsletter/
>
> The information in this email is confidential and may be legally
> privileged. If you are not the intended recipient please notify the
> sender immediately and destroy this email. Any unauthorized, direct or
> indirect, disclosure, copying, storage, distribution or other use is
> strictly forbidden.