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https://issues.apache.org/jira/browse/TOREE-391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luciano Resende updated TOREE-391:
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Fix Version/s: 0.2.0
> Messages to Jupyter kernel gateway are dropped in jeromq
> --------------------------------------------------------
>
> Key: TOREE-391
> URL: https://issues.apache.org/jira/browse/TOREE-391
> Project: TOREE
> Issue Type: Bug
> Affects Versions: 0.1.0, 0.2.0
> Environment: Linux ( RHEL 7.3 )
> Reporter: Jim Rhyness
> Assignee: Jim Rhyness
> Labels: newbie
> Fix For: 0.2.0
>
>
> Kernel restart from Jupyter kernel gateway is failing with a timeout. The
> kernel is restarted, but kernel gateway times out waiting for a
> kernel_info_reply message that it is
> expecting in response to kernel_info_request that it sends after initiating
> the restart.
> The problem is reproducible most of the time with something like this:
> curl -v -X POST --data '{ "name":"apache_toree_scala" }'
> http://127.0.0.1:8888/api/kernels
> curl -v -X POST --data '{}'
> http://127.0.0.1:8888/api/kernels/<kernelid-from-above>/restart
> From the IPython message protocol doc, this is the message format:
> [
> b'u-u-i-d', # zmq identity(ies)
> b'<IDS|MSG>', # delimiter
> b'baddad42', # HMAC signature
> b'{header}', # serialized header dict
> b'{parent_header}', # serialized parent header dict
> b'{metadata}', # serialized metadata dict
> b'{content}, # serialized content dict
> b'blob', # extra raw data buffer(s)
> ...
> ]
> The first frame of the message contains zmq identities which, in some cases
> in a Router-type socket, are generated by jeromq and then consist of five
> bytes - 0 followed by a random int.
> In Toree, all frames are treated as Strings. Conversion to UTF-8 corrupts
> the zmq id, replacing non-UTF-8 characters by the replacement character
> 0xEFBFBD.
> When the corrupted id is used in a message sent to the Router socket, the
> peer to send the message to is not found and the message is dropped.
> This affects other messages as well, not just kernel_info_reply.
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