Add byte counters to SpannerIO.write
Open
gcp
improvement
io
java
P3
- Dominant language
- Java
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Description
Currently SpannerIO has counters that count the number of mutationgroups written and the number successful writes to spanner.
A common customer complaint regarding Spanner import is the lack of job progress information and a byte counter which shows the successful bytes written to spanner would help alleviate some customer pain.
cc [~nielm]
Imported from Jira [BEAM-9910](https://issues.apache.org/jira/browse/BEAM-9910). Original Jira may contain additional context.
Reported by: alxavier.
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