If you're using Avro's RPC
mechanism, schemas are only sent when the
client and server do not
already have each other's schema. Each
client request is preceded by
a hash of the clients schema and the
schema it thinks the server is
using. If the server already has the
client's schema, and the client
already has the server's, then the
server can directly respond. If
they do not have the other's schema
then schemas are transmitted and
cached. This way the server's schema
is only transmitted for the
first request from a given client, and the
client's schema is only
transmitted to the server the first time a
client with that schema
connects.
Avro Python does support RPC.
If you're not
using Avro RPC but some other messaging mechanism, then
AVRO-1124 as
you mention might be useful, but it also has not yet been
released.
If
you're storing Avro data in a file, then the Schema is included in
the
file, as you mention.
Doug
I found Deepesh's question back
in December. I have joined the mailing
list later. So don't have the message in my inbox and I do not know the
proper way to reply. Anyway I have include the original message below.
I have the similar issue. In addition I'm interested to find out
about
Python and Node js library support.
From what I understand, the avro specification requires avro.schema.
So
I am quite unsure of the status of have the schema in an external
repository.
- avro.schema contains the schema of objects stored in the file, as
JSON data (required).
http://avro.apache.org/docs/1.7.6/spec.html#Object+Container+Files
Wai Yip
