[Gluster-users] java application crushes while reading a zip file

[Raghavendra Gowdappa]

On Fri, Dec 28, 2018 at 3:13 AM Dmitry Isakbayev <isakdim at gmail.com> wrote:

> Raghavendra,
>
> Thank  for the suggestion.
>
>
> I am suing
>
> [root at jl-fanexoss1p glusterfs]# gluster --version
> glusterfs 5.0
>
> On
> [root at jl-fanexoss1p glusterfs]# hostnamectl
>          Icon name: computer-vm
>            Chassis: vm
>         Machine ID: e44b8478ef7a467d98363614f4e50535
>            Boot ID: eed98992fdda4c88bdd459a89101766b
>     Virtualization: vmware
>   Operating System: Red Hat Enterprise Linux Server 7.5 (Maipo)
>        CPE OS Name: cpe:/o:redhat:enterprise_linux:7.5:GA:server
>             Kernel: Linux 3.10.0-862.14.4.el7.x86_64
>       Architecture: x86-64
>
>
> I have configured the following options
>
> [root at jl-fanexoss1p glusterfs]# gluster volume info
> Volume Name: gv0
> Type: Replicate
> Volume ID: 5ffbda09-c5e2-4abc-b89e-79b5d8a40824
> Status: Started
> Snapshot Count: 0
> Number of Bricks: 1 x 3 = 3
> Transport-type: tcp
> Bricks:
> Brick1: jl-fanexoss1p.cspire.net:/data/brick1/gv0
> Brick2: sl-fanexoss2p.cspire.net:/data/brick1/gv0
> Brick3: nxquorum1p.cspire.net:/data/brick1/gv0
> Options Reconfigured:
> performance.io-cache: off
> performance.stat-prefetch: off
> performance.quick-read: off
> performance.parallel-readdir: off
> performance.readdir-ahead: off
> performance.write-behind: off
> performance.read-ahead: off
> performance.client-io-threads: off
> nfs.disable: on
> transport.address-family: inet
>
> I don't know if it is related, but I am seeing a lot of
> [2018-12-27 20:19:23.776080] W [MSGID: 114031]
> [client-rpc-fops_v2.c:1932:client4_0_seek_cbk] 2-gv0-client-0: remote
> operation failed [No such device or address]
> [2018-12-27 20:19:47.735190] E [MSGID: 101191]
> [event-epoll.c:671:event_dispatch_epoll_worker] 2-epoll: Failed to dispatch
> handler
>

These msgs were introduced by patch [1]. To the best of my knowledge they
are benign. We'll be sending a patch to fix these msgs though.

+Mohit Agrawal <moagrawa at redhat.com> +Milind Changire <mchangir at redhat.com>
. Can you try to identify why we are seeing these messages? If possible
please send a patch to fix this.

[1] https://review.gluster.org/r/I578c3fc67713f4234bd3abbec5d3fbba19059ea5


> And java.io exceptions trying to rename files.
>

When you see the errors is it possible to collect,
* strace of the java application (strace -ff -v ...)
* fuse-dump of the glusterfs mount (use option --dump-fuse while mounting)?

I also need another favour from you. By trail and error, can you point out
which of the many performance xlators you've turned off is causing the
issue?

The above two data-points will help us to fix the problem.


> Thank You,
> Dmitry
>
>
> On Thu, Dec 27, 2018 at 3:48 PM Raghavendra Gowdappa <rgowdapp at redhat.com>
> wrote:
>
>> What version of glusterfs are you using? It might be either
>> * a stale metadata issue.
>> * inconsistent ctime issue.
>>
>> Can you try turning off all performance xlators? If the issue is 1, that
>> should help.
>>
>> On Fri, Dec 28, 2018 at 1:51 AM Dmitry Isakbayev <isakdim at gmail.com>
>> wrote:
>>
>>> Attempted to set 'performance.read-ahead off` according to
>>> https://jira.apache.org/jira/browse/AMQ-7041
>>> That did not help.
>>>
>>> On Mon, Dec 24, 2018 at 2:11 PM Dmitry Isakbayev <isakdim at gmail.com>
>>> wrote:
>>>
>>>> The core file generated by JVM suggests that it happens because the
>>>> file is changing while it is being read -
>>>> https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8186557.
>>>> The application reads in the zipfile and goes through the zip entries,
>>>> then reloads the file and goes the zip entries again.  It does so 3 times.
>>>> The application never crushes on the 1st cycle but sometimes crushes on the
>>>> 2nd or 3rd cycle.
>>>> The zip file is generated about 20 seconds prior to it being used and
>>>> is not updated or even used by any other application.  I have never seen
>>>> this problem on a plain file system.
>>>>
>>>> I would appreciate any suggestions on how to go debugging this issue.
>>>> I can change the source code of the java application.
>>>>
>>>> Regards,
>>>> Dmitry
>>>>
>>>>
>>>> _______________________________________________
>>> Gluster-users mailing list
>>> Gluster-users at gluster.org
>>> https://lists.gluster.org/mailman/listinfo/gluster-users
>>
>>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.gluster.org/pipermail/gluster-users/attachments/20181228/9211dbfb/attachment.html>