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From "Amit Sela (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-1177) Input DStream "bundles" should be in serialized form and include relevant metadata.
Date Sun, 18 Dec 2016 13:40:58 GMT

    [ https://issues.apache.org/jira/browse/BEAM-1177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15758852#comment-15758852
] 

Amit Sela commented on BEAM-1177:
---------------------------------

Instead of simply emitting {{Iterable<byte[]>}} per partition, I'll emit {{Tuple2<Iterable<byte[]>,
Metadata>}} to be able to report read count and watermark per batch.

{code}
class Metadata {
  private final long numRecords;
  private final Instant watermark;

  public Metadata(long numRecords, Instant watermark) {
    this.numRecords = numRecords;
    this.watermark = watermark;
  }

  public long getNumRecords() {
    return numRecords;
  }

  public Instant getWatermark() {
    return watermark;
  }
}
{code}

> Input DStream "bundles" should be in serialized form and include relevant metadata.
> -----------------------------------------------------------------------------------
>
>                 Key: BEAM-1177
>                 URL: https://issues.apache.org/jira/browse/BEAM-1177
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-spark
>            Reporter: Amit Sela
>            Assignee: Amit Sela
>
> Currently, the input partitions hold "bundles" of read elements within the {{mapWithStateDStream}}
used for the read.
> Since this is automatically shuffled, user-data (the read elements) should be serialized
using coders to avoid breaking (if user-data is not {{Kryo}} serializable).
> Even after BEAM-848 would complete, the resulting {{MapWithStateDStream}} would be checkpointed
periodically and so it would still have to remain in serialized form.



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