Re: GlusterFS and Kafka

[Vijay Bellur <vbellur@xxxxxxxxxx>]

On Tue, May 23, 2017 at 1:39 AM, Christopher Schmidt <fakod666@xxxxxxxxx> wrote:

OK, seems that this works now.

A couple of questions:

- What do you think, are all these options necessary for Kafka?

I am not entirely certain what subset of options will make it work as I do not understand the nature of failure with  Kafka and the default gluster configuration. It certainly needs further analysis to identify the list of options necessary. Would it be possible for you to enable one option after the other and determine the configuration that ?

 

- You wrote that there have to be kind of application profiles. So to find out, which set of options work is currently a matter of testing (and hope)? Or are there any experiences for MongoDB / ProstgreSQL / Zookeeper etc.?

Application profiles are work in progress. We have a few that are focused on use cases like VM storage, block storage etc. at the moment.

 

- I am using Heketi and Dynamik Storage Provisioning together with Kubernetes. Can I set this volume options somehow by default or by volume plugin?

Adding Raghavendra and Michael to help address this query.

-Vijay

 

Thanks for you help... really appreciated.. Christopher

Vijay Bellur <vbellur@xxxxxxxxxx> schrieb am Mo., 22. Mai 2017 um 16:41 Uhr:

Looks like a problem with caching. Can you please try by disabling all performance translators? The following configuration commands would disable performance translators in the gluster client stack:

gluster volume set <volname> performance.quick-read off

gluster volume set <volname> performance.io-cache off

gluster volume set <volname> performance.write-behind off

gluster volume set <volname> performance.stat-prefetch off

gluster volume set <volname> performance.read-ahead off

gluster volume set <volname> performance.readdir-ahead off

gluster volume set <volname> performance.open-behind off

gluster volume set <volname> performance.client-io-threads off

Thanks,

Vijay

On Mon, May 22, 2017 at 9:46 AM, Christopher Schmidt <fakod666@xxxxxxxxx> wrote:

Hi all,

has anyone ever successfully deployed a Kafka (Cluster) on GlusterFS volumes?

I my case it's a Kafka Kubernetes-StatefulSet and a Heketi GlusterFS.

Needless to say that I am getting a lot of filesystem related exceptions like this one:

Failed to read `log header` from file channel `sun.nio.ch.FileChannelImpl@67afa54a`. Expected to read 12 bytes, but reached end of file after reading 0 bytes. Started read from position 123065680.

I limited the amount of exceptions with the log.flush.interval.messages=1 option, but not all...

best Christopher

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