Handle partial write update from GCS

[mayanks]

Connector supports resuming upload only from MAX_BYTES_PER_MESSAGE boundary. If GCS reports a committed offset which is not a multiple of this number, then we cannot resume.

[mayanks]

/gcbrun

[codecov[bot]]

Codecov Report

Merging #781 (71ecf70) into master (d465885) will decrease coverage by 18.33%. The diff coverage is 0.00%.

@@              Coverage Diff              @@
##             master     #781       +/-   ##
=============================================
- Coverage     81.23%   62.89%   -18.34%     
+ Complexity     1978     1446      -532     
=============================================
  Files           133      133               
  Lines          8818     8822        +4     
  Branches       1025     1026        +1     
=============================================
- Hits           7163     5549     -1614     
- Misses         1240     2735     +1495     
- Partials        415      538      +123     

Flag	Coverage Δ
integrationtest	62.89% <0.00%> (-0.15%)	:arrow_down:
unittest	?

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Impacted Files	Coverage Δ
...doop/gcsio/GoogleCloudStorageGrpcWriteChannel.java	64.46% <0.00%> (-15.09%)	:arrow_down:
...a/com/google/cloud/hadoop/util/AccessBoundary.java	0.00% <0.00%> (-100.00%)	:arrow_down:
...om/google/cloud/hadoop/util/IoExceptionHelper.java	0.00% <0.00%> (-100.00%)	:arrow_down:
...le/cloud/hadoop/io/bigquery/ShardedInputSplit.java	0.00% <0.00%> (-100.00%)	:arrow_down:
...d/hadoop/gcsio/testing/GcsItemInfoTestBuilder.java	0.00% <0.00%> (-100.00%)	:arrow_down:
...bigquery/output/FederatedBigQueryOutputFormat.java	0.00% <0.00%> (-100.00%)	:arrow_down:
...query/output/FederatedBigQueryOutputCommitter.java	0.00% <0.00%> (-100.00%)	:arrow_down:
...gcsio/StorageRequestToAccessBoundaryConverter.java	0.00% <0.00%> (-98.77%)	:arrow_down:
...d/hadoop/util/testing/MockHttpTransportHelper.java	0.00% <0.00%> (-96.67%)	:arrow_down:
...adoop/io/bigquery/DynamicFileListRecordReader.java	0.00% <0.00%> (-93.60%)	:arrow_down:
... and 70 more

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