[BEAM-2411] Make the write transform of HBaseIO simpler

[iemejia]

Be sure to do all of the following to help us incorporate your contribution
quickly and easily:

• Make sure the PR title is formatted like:
  [BEAM-<Jira issue #>] Description of pull request
• Make sure tests pass via mvn clean verify.
• Replace <Jira issue #> in the title with the actual Jira issue
  number, if there is one.
• If this contribution is large, please file an Apache
  Individual Contributor License Agreement.

---

[iemejia]

R: @jkff A simplification based on our discussion on the Bigtable-HBase duality.

[iemejia]

There is an extra thing, notice that I made elementCounters for debug per bundle, this is a fix on the previous version, and aligns it with BigtableIO.

[coveralls]

Coverage remained the same at 70.695% when pulling eee4350 on iemejia:BEAM-2411-make-hbaseio-write-simpler into 0cabdf6 on apache:master.

[coveralls]

Coverage decreased (-0.003%) to 70.691% when pulling eee4350 on iemejia:BEAM-2411-make-hbaseio-write-simpler into 0cabdf6 on apache:master.

[coveralls]

Coverage remained the same at 70.695% when pulling eee4350 on iemejia:BEAM-2411-make-hbaseio-write-simpler into 0cabdf6 on apache:master.

[jkff]

Thanks! LGTM but also feel free to implement the suggested coder improvement.

[jkff]

While we're at simplifying things.. I believe you can remove this and all the setCoder calls by using something like https://github.com/apache/beam/blob/master/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/BigQueryCoderProviderRegistrar.java

[iemejia]

Thanks for the hint on the CoderProviderRegistrar, I am going to take a look and add it to the PR

[lukecwik]

Retest this please

[coveralls]

Coverage decreased (-0.007%) to 70.684% when pulling d42f633 on iemejia:BEAM-2411-make-hbaseio-write-simpler into 2304972 on apache:master.

[iemejia]

Thanks for the review/ideas Eugene.