[openstack-dev] [Ceilometer] Need help with HBase backend

Stas Maksimov maksimov at gmail.com
Mon Aug 12 14:17:24 UTC 2013

Aha, so here it goes. The problem was not caused by monkey-patching or
multithreading issues, it was caused by the DevStack VM losing its
connection and getting a new address from the DHCP server. Once I fixed the
connection issues, the problem with eventlet disappeared.

Hope this helps,

On 12 August 2013 14:49, Stas Maksimov <maksimov at gmail.com> wrote:

> Hi Thomas,
> I definitely saw this before, iirc it was caused by monkey-patching
> somewhere else in ceilometer. It was fixed in the end before i submitted
> hbase implementation.
> At this moment unfortunately that's all I can recollect on the subject.
> I'll get back to you if I have an 'aha' moment on this. Feel free to
> contact me off-list regarding this hbase driver.
> Thanks,
> Stas.
>  Hey team,
>  I am working on a fix for retrieving the latest metadata on a resource
> rather than the first with the HBase implementation, and I'm running into
> some trouble when trying to get my dev environment to work with HBase. It
> looks like a concurrency issue when it tries to store the metering data.
> I'm getting the following error in my logs (summary):
>  *013-08-11 18:52:33.980 2445 ERROR
> ceilometer.collector.dispatcher.database
> [req-3b3c65c9-1a1b-4b5d-bba5-8224f074b176 None None] Second simultaneous
> read on fileno 7 detected.  Unless you really know what you're doing, make
> sure that only one greenthread can read any particular socket.  Consider
> using a pools.Pool. If you do know what you're doing and want to disable
> this error, call eventlet.debug.hub_prevent_multiple_readers(False)*
>  *Full traceback*: http://paste.openstack.org/show/43872/
>  Has anyone else run into this lovely little problem? It looks like the
> implementation needs to use happybase.ConnectionPool, unless I'm missing
> something.
>  Thanks in advance for help! :)
>  -Thomas
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