Zhiheng Huang created BEAM-4667:
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Summary: Potential issue with QuantileStateCoder
Key: BEAM-4667
URL: https://issues.apache.org/jira/browse/BEAM-4667
Project: Beam
Issue Type: Bug
Components: sdk-java-core
Reporter: Zhiheng Huang
Assignee: Kenneth Knowles
[https://github.com/apache/beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/ApproximateQuantiles.java#L687]
The line above encodes the QuantileState buffers.size() as if it's numBuffers.
This seems wrong since before buffers are full, buffers.size() is not equal to
numBuffers. One thing I suspect will happen is that, if we serialize before
buffer is full, it will effectively reduce the number of buffers we maintain
after deserialization.
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