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From "Stephen Sisk (JIRA)" <>
Subject [jira] [Commented] (BEAM-2439) Datastore writer can fail to progress if Datastore is slow
Date Tue, 13 Jun 2017 16:26:00 GMT


Stephen Sisk commented on BEAM-2439:

thanks for letting us know. 

> Datastore writer can fail to progress if Datastore is slow
> ----------------------------------------------------------
>                 Key: BEAM-2439
>                 URL:
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-java-gcp
>            Reporter: Colin Phipps
>            Assignee: Stephen Sisk
>            Priority: Minor
>              Labels: datastore
> When writing to Datastore, Beam groups writes into large batches (usually 500 entities
per write, the maximum permitted by the API). If these writes are slow to commit on the serving
side, the request may time out before all of the entities are written.
> When this happens, it loses any progress that has been made on those entities (the connector
uses non-transactional writes, so some entities might have been written, but partial results
are not returned to the connector so it has to assume that all entities need rewriting). It
will retry the write with the same set of entities, which may time out in the same way repeatedly.
This can be influenced by factors on the Datastore serving side, some of which are transient
(hotspots) but some of which are not.
> We (Datastore) are developing a fix for this.

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