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Posted to issues@beam.apache.org by "Chad Dombrova (Jira)" <ji...@apache.org> on 2019/09/18 03:49:00 UTC
[jira] [Created] (BEAM-8271) StateGetRequest/Response
continuation_token should be string
Chad Dombrova created BEAM-8271:
-----------------------------------
Summary: StateGetRequest/Response continuation_token should be string
Key: BEAM-8271
URL: https://issues.apache.org/jira/browse/BEAM-8271
Project: Beam
Issue Type: Improvement
Components: beam-model
Reporter: Chad Dombrova
Assignee: Chad Dombrova
I've been working on adding typing to the python code and I came across a discrepancy between regarding the type of the continuation token. The .proto defines it as bytes, but the code treats it as a string (i.e. unicode):
{code:java}
// A request to get state.
message StateGetRequest {
// (Optional) If specified, signals to the runner that the response
// should resume from the following continuation token.
//
// If unspecified, signals to the runner that the response should start
// from the beginning of the logical continuable stream.
bytes continuation_token = 1;
}
// A response to get state representing a logical byte stream which can be
// continued using the state API.
message StateGetResponse {
// (Optional) If specified, represents a token which can be used with the
// state API to get the next chunk of this logical byte stream. The end of
// the logical byte stream is signalled by this field being unset.
bytes continuation_token = 1;
// Represents a part of a logical byte stream. Elements within
// the logical byte stream are encoded in the nested context and
// concatenated together.
bytes data = 2;
}
{code}
From FnApiRunner.StateServicer:
{code:python}
def blocking_get(self, state_key, continuation_token=None):
with self._lock:
full_state = self._state[self._to_key(state_key)]
if self._use_continuation_tokens:
# The token is "nonce:index".
if not continuation_token:
token_base = 'token_%x' % len(self._continuations)
self._continuations[token_base] = tuple(full_state)
return b'', '%s:0' % token_base
else:
token_base, index = continuation_token.split(':')
ix = int(index)
full_state = self._continuations[token_base]
if ix == len(full_state):
return b'', None
else:
return full_state[ix], '%s:%d' % (token_base, ix + 1)
else:
assert not continuation_token
return b''.join(full_state), None
{code}
This could be a problem in python3.
All other id values are string, whereas bytes is reserved for data, so I think that the proto should be changed to string.
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