Perhaps.  I'd have to ask my boss for permission to release the code.

Is this something that would be interesting/useful to other people? If so, I can ask about it.


On 08/05/2010 11:02 PM, Jonathan Holloway wrote:
Hi David,

We did discuss potentially doing this as well.  It would be nice to get some
recipes for Zookeeper done for this area, if people think it's useful.  Were
you thinking of submitting this back as a recipe, if not then I could
potentially work on such a recipe instead.

Many thanks,

I just ran into this exact situation, and handled it like so:

I wrote a library that uses the option (b) you described above.  Only
instead of requesting a single sequence number, you request a block of them
at a time from Zookeeper, and then locally use them up one by one from the
block you retrieved.  Retrieving by block (e.g., by blocks of 10000 at a
time) eliminates the contention issue.

Then, if you're finished assigning ID's from that block, but still have a
bunch of ID's left in the block, the library has another function to "push
back" the unused ID's.  They'll then get pulled again in the next block

We don't actually have this code running in production yet, so I can't
vouch for how well it works.  But the design was reviewed and given the
thumbs up by the core developers on the team, and the implementation passes
all my unit tests.

HTH.  Feel free to email back with specific questions if you'd like more


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