Sharing data between appengine modules
I'm trying to use appengine datastore to share a key between appengine modules. I'm writing the key in one module, I can read it from that module. Trying to read it from the second module doesn't work, and I get no such entity response. What's the best way to share a key between modules? can I use datastore for that? from what I have read in the documentation data store is shared between services. but it doesn't seems to work for me.
There are eventual consistency issues you may be hitting. Datastore is distributed so it's possible one service hits a consistent version of the data and another service(module) hits another version that is stale. The datastore is definitely a way to share data between modules so it could either be a consistency problem where you won't be guaranteed to be able to read the data back right away unless you restructure your data or your query to be strongly consistent, or it could be some other problem like you have the wrong key in the other module or are somehow hitting a different namespace. Here are a some resources on datastore consistency: https://cloud.google.com/datastore/docs/concepts/structuring_for_strong_consistency https://cloud.google.com/datastore/docs/articles/balancing-strong-and-eventual-consistency-with-google-cloud-datastore/ https://cloud.google.com/datastore/docs/best-practices From the last link: If you need strong consistency for your queries, use an ancestor query. (To use ancestor queries, you first need to structure your data for strong consistency.) An ancestor query returns strongly consistent results. Note that a non-ancestor keys-only query followed by a lookup() does not return strong results, because the non-ancestor keys-only query could get results from an index that is not consistent at the time of the query.
How to setup data fixtures in Google App Engine for Go
How to write a JDO Query to sort result based on long attribute?
GAE doesn't import gflags
Real time notification system on Google App Engine(GAE)
How can I easily get a list of the indexed terms from a search index in the google appengine full text search api in java?
jpa #version on google appengine with #OneToMany: appengine bug or usage error?
How can I delete old backup via cron?
Error on itext-gae.jar
How to get the original from address in a forwarded message in google app engine?
Cannot authorize my google app to access my Cloud SQL instance
GooglePlaces autocomplete - more than one input
Import GAE data through Storage into BigQuery fails
Google AppEngine Tutorial, difference between code snippets
OpenID sign in not working in Gmail contextual gadget
Problems getting a basic JAXRS + JPA version working on GAE
Appengine's Indexing order, cursors, and aggregation