xmerl missing for the worker workers

[benoitc]

I'm actually unsure how to deploy a worker using core applications like xmerl. I can start it localy, but when it's launched using mzbench I got the following error:

{error,{xmerl,{"no such file or directory","xmerl.app"}}}}

It seems that mzbench is using a custom erts image:

admin@server-1:~/mzbench$ ls ~/.local/cache/mzbench_api/packages/
mzbench_oncam-040abba-linux-3.13.0-48-generic_erts-7.3.tgz           mzbench_oncam-a6a3762-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz
mzbench_oncam-040abba-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz  mzbench_oncam-a9e5032-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz
mzbench_oncam-22b0a36-linux-3.13.0-48-generic_erts-7.3.tgz           mzbench_oncam-b0278ca-linux-3.13.0-48-generic_erts-7.3.tgz
mzbench_oncam-22b0a36-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz  mzbench_oncam-b0278ca-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz
mzbench_oncam-23200ed-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz  mzbench_oncam-b2df391-linux-3.13.0-48-generic_erts-7.3.tgz
mzbench_oncam-310796e-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz  mzbench_oncam-b2df391-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz
mzbench_oncam-324db9d-linux-3.13.0-48-generic_erts-7.3.tgz           mzbench_oncam-c1ecf76-linux-3.13.0-48-generic_erts-7.3.tgz
mzbench_oncam-324db9d-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz  mzbench_oncam-c1ecf76-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz
mzbench_oncam-36fbed3-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz  mzbench_oncam-c4cb1f1-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz
mzbench_oncam-38bd6c5-linux-3.13.0-48-generic_erts-7.3.tgz           mzbench_oncam-c970442-linux-3.13.0-48-generic_erts-7.3.tgz
mzbench_oncam-38bd6c5-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz  mzbench_oncam-c970442-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz
mzbench_oncam-431937d-linux-3.13.0-48-generic_erts-7.3.tgz           mzbench_oncam-ca365c9-linux-3.13.0-48-generic_erts-7.3.tgz
mzbench_oncam-431937d-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz  mzbench_oncam-ca365c9-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz
mzbench_oncam-4363c70-linux-3.13.0-48-generic_erts-7.3.tgz           mzbench_oncam-dff4634-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz
mzbench_oncam-4363c70-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz  mzbench_oncam-eaef650-linux-3.13.0-48-generic_erts-7.3.tgz
mzbench_oncam-4f70e3b-linux-3.13.0-48-generic_erts-7.3.tgz           mzbench_oncam-eaef650-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz
mzbench_oncam-4f70e3b-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz  mzbench_oncam-eb3e41f-linux-3.13.0-48-generic_erts-7.3.tgz
mzbench_oncam-5976165-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz  mzbench_oncam-eb3e41f-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz
mzbench_oncam-59938db-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz  mzbench_oncam-f198956-linux-3.13.0-48-generic_erts-7.3.tgz
mzbench_oncam-6129b8b-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz  mzbench_oncam-f198956-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz
mzbench_oncam-7a0aa71-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz  mzbench_oncam-f7ca1a5-linux-3.13.0-48-generic_erts-7.3.tgz
mzbench_oncam-808e896-linux-3.13.0-48-generic_erts-7.3.tgz           mzbench_oncam-f7ca1a5-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz
mzbench_oncam-808e896-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz  mzbench_oncam-ff883bc-linux-3.13.0-48-generic_erts-7.3.tgz
mzbench_oncam-9f7b005-linux-3.13.0-48-generic_erts-7.3.tgz           mzbench_oncam-ff883bc-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz
mzbench_oncam-9f7b005-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz  node-06d13c618526b11792d3bb2c2e8f5d275943cfaa-linux-3.13.0-48-generic_erts-7.3.tgz
mzbench_oncam-9fd266c-linux-3.13.0-48-generic_erts-7.3.tgz           node-06d13c618526b11792d3bb2c2e8f5d275943cfaa-linux-3.14.48-33.39.amzn1.x86_64_erts-7.3.tgz

but how to set it? How can I have a worker using xmerl?

[parsifal-47]

Hi!
you need to pack xmerl with your worker, as we do for http worker, for example:
https://github.com/machinezone/mzbench/blob/master/workers/http/Makefile

all complied deps are copied to pkgroot and then packed to be extracted on deployment. I suppose that for some reason xmerl was not copied at this step.

About erts version:
these tgz files are used to cache compiled binaries. These binaries are compiled at worker hosts so erts could be different, we keep version name in cached filename.

For example: if you start MZBench API server on erlang 17 and use erlang 18 on your nodes you will see erts version for erlang 18 in ~/.local/cache/mzbench_api/packages/

If some of your nodes have erlang 17 and some erlang 18, you will see both versions of erts.

Please let me know if you have any follow-up questions