Question: Document Patches

[Crispy1975]

Wanted to get a better understanding of how the various PATCH options work with monstache. We have turned on the enable-patches option to see if we can speed up operations some more (they are fast now, but more speed is always good :)

Does this option stop monstache from removing the ES document and then inserting a fresh copy by updating/patching the existing ES document?

[rwynn]

@Crispy1975,

When enable-patches is set to true, monstache needs to do more work and would actually be slower. Sorry if I was not clear enough with what that setting does. When enabled, monstache will compare new or updated documents from MongoDB to the latest corresponding (by _id) document in Elasticsearch and create a merge patch document will the difference between the two. Then, it will add the difference to the new or update MongoDB document before indexing it into ElasticSearch.

Then enable-patches setting does not affect the behavior of deletes, only inserts and updates. For an insert, the difference is just the whole document itself. For an update, monstache needs to call the Elasticsearch REST API to get the previous version in order to do the compare.

[Crispy1975]

@rwynn thanks for the clarification. 👍

[rwynn]

@Crispy1975 just release monstache 3.0 which some major internal changes. There are a couple of configuration changes with regards to Elasticsearch but nothing drastic. Hopefully, this version will give you better performance. Thanks!