Dmitry,
Thanks for the detailed updates on this thread. Let us know how your 'production' setup is running. For much smoother next upgrade, we request you to help out with some early testing of glusterfs-6 RC builds which are expected to be out by Feb 1st week.
Also, if it is possible for you to automate the tests, it would be great to have it in our regression, so we can always be sure your setup would never break in future releases.
Regards,
Amar
On Mon, Jan 7, 2019 at 11:42 PM Dmitry Isakbayev <isakdim@xxxxxxxxx> wrote:
_______________________________________________This system is going into production. I will try to replicate this problem on the next installation.On Wed, Jan 2, 2019 at 9:25 PM Raghavendra Gowdappa <rgowdapp@xxxxxxxxxx> wrote:On Wed, Jan 2, 2019 at 9:59 PM Dmitry Isakbayev <isakdim@xxxxxxxxx> wrote:Still no JVM crushes. Is it possible that running glusterfs with performance options turned off for a couple of days cleared out the "stale metadata issue"?restarting these options, would've cleared the existing cache and hence previous stale metadata would've been cleared. Hitting stale metadata again depends on races. That might be the reason you are still not seeing the issue. Can you try with enabling all perf xlators (default configuration)?On Mon, Dec 31, 2018 at 1:38 PM Dmitry Isakbayev <isakdim@xxxxxxxxx> wrote:The software ran with all of the options turned off over the weekend without any problems.I will try to collect the debug info for you. I have re-enabled the 3 three options, but yet to see the problem reoccurring.On Sat, Dec 29, 2018 at 6:46 PM Raghavendra Gowdappa <rgowdapp@xxxxxxxxxx> wrote:Raghavendraregards,* dump of the I/O traffic seen by the mountpoint (use --dump-fuse while mounting).Thanks Dmitry. Can you provide the following debug info I asked earlier:* strace -ff -v ... of java applicationOn Sat, Dec 29, 2018 at 2:08 AM Dmitry Isakbayev <isakdim@xxxxxxxxx> wrote:These 3 options seem to trigger both (reading zip file and renaming files) problems.Options Reconfigured:performance.io-cache: offperformance.stat-prefetch: offperformance.quick-read: offperformance.parallel-readdir: offperformance.readdir-ahead: onperformance.write-behind: onperformance.read-ahead: onperformance.client-io-threads: offnfs.disable: ontransport.address-family: inetOn Fri, Dec 28, 2018 at 10:24 AM Dmitry Isakbayev <isakdim@xxxxxxxxx> wrote:Turning a single option on at a time still worked fine. I will keep trying.We had used 4.1.5 on KVM/CentOS7.5 at AWS without these issues or log messages. Do you suppose these issues are triggered by the new environment or did not exist in 4.1.5?[root@node1 ~]# glusterfs --versionglusterfs 4.1.5On AWS using[root@node1 ~]# hostnamectlStatic hostname: node1Icon name: computer-vmChassis: vmMachine ID: b30d0f2110ac3807b210c19ede3ce88fBoot ID: 52bb159a0aa94043a40e7c7651967bd9Virtualization: kvmOperating System: CentOS Linux 7 (Core)CPE OS Name: cpe:/o:centos:centos:7Kernel: Linux 3.10.0-862.3.2.el7.x86_64Architecture: x86-64On Fri, Dec 28, 2018 at 8:56 AM Raghavendra Gowdappa <rgowdapp@xxxxxxxxxx> wrote:On Fri, Dec 28, 2018 at 7:23 PM Dmitry Isakbayev <isakdim@xxxxxxxxx> wrote:Ok. I will try different options.This system is scheduled to go into production soon. What version would you recommend to roll back to?These are long standing issues. So, rolling back may not make these issues go away. Instead if you think performance is agreeable to you, please keep these xlators off in production.
On Thu, Dec 27, 2018 at 10:55 PM Raghavendra Gowdappa <rgowdapp@xxxxxxxxxx> wrote:On Fri, Dec 28, 2018 at 3:13 AM Dmitry Isakbayev <isakdim@xxxxxxxxx> wrote:Raghavendra,Thank for the suggestion.I am suing[root@jl-fanexoss1p glusterfs]# gluster --versionglusterfs 5.0On[root@jl-fanexoss1p glusterfs]# hostnamectlIcon name: computer-vmChassis: vmMachine ID: e44b8478ef7a467d98363614f4e50535Boot ID: eed98992fdda4c88bdd459a89101766bVirtualization: vmwareOperating System: Red Hat Enterprise Linux Server 7.5 (Maipo)CPE OS Name: cpe:/o:redhat:enterprise_linux:7.5:GA:serverKernel: Linux 3.10.0-862.14.4.el7.x86_64Architecture: x86-64I have configured the following options[root@jl-fanexoss1p glusterfs]# gluster volume infoVolume Name: gv0Type: ReplicateVolume ID: 5ffbda09-c5e2-4abc-b89e-79b5d8a40824Status: StartedSnapshot Count: 0Number of Bricks: 1 x 3 = 3Transport-type: tcpBricks:Brick1: jl-fanexoss1p.cspire.net:/data/brick1/gv0Brick2: sl-fanexoss2p.cspire.net:/data/brick1/gv0Brick3: nxquorum1p.cspire.net:/data/brick1/gv0Options Reconfigured:performance.io-cache: offperformance.stat-prefetch: offperformance.quick-read: offperformance.parallel-readdir: offperformance.readdir-ahead: offperformance.write-behind: offperformance.read-ahead: offperformance.client-io-threads: offnfs.disable: ontransport.address-family: inetI 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 handlerThese 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 +Milind Changire . Can you try to identify why we are seeing these messages? If possible please send a patch to fix this.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,DmitryOn Thu, Dec 27, 2018 at 3:48 PM Raghavendra Gowdappa <rgowdapp@xxxxxxxxxx> wrote:What version of glusterfs are you using? It might be either* inconsistent ctime issue.
* a stale metadata 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@xxxxxxxxx> wrote:Attempted to set 'performance.read-ahead off` according to https://jira.apache.org/jira/browse/AMQ-7041That did not help._______________________________________________On Mon, Dec 24, 2018 at 2:11 PM Dmitry Isakbayev <isakdim@xxxxxxxxx> 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
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Amar Tumballi (amarts)
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