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Warning

Prior to version 3.1.x Kafka Streams might emit so called "spurious" left/outer join result. In this section we only explain the different new behavior that avoids spurious left/outer stream-stream join results. See New Join Semantics below that describe all joins in more details, including spurious left/output join behavior in versions 0.10.2.x  to 3.0.x. 

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ts

STREAM_1 (left)

STREAM_2 (right)

innerJoin (same as in older versions)

leftJoin

outerJoin

1

null





2


null




3

A





4


a

A - aA - a

A - a

5

B


B - a

B - a

B - a

6


b

A - b

B - b

A - b

B - b

A - b

B - b

7

null





8


null




9

C


C - a

C - b

C - a

C - b

C - a

C - b

10


c

A - c

B - c

C - c

A - c

B - c

C - c

A - c

B - c

C - c

11


null




12

null





13


null




14


d

A - d

B - d

C - d

A - d

B - d

C - d

A - d

B - d

C - d

15

D


D - a

D - b

D - c

D - d

D - a

D - b

D - c

D - d

D - a

D - b

D - c

D - d

...




40E



...




60F

E - nullE - null
...




80
f
F - nullF - null
...




100G


null - f

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Warning

This section describes the new join semantics as of version 0.10.2.x. For old join semantics (version 0.10.0.x and 0.10.1.x) see Old Join Semantics below.

(See KIP-77: Improve Kafka Streams Join Semantics)

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The table below marks so called "spurious" left/outer join results, that are in the result in version 0.10.2.x to 3.0.x, in bold face. Compare Improved left/outer stream-stream join above for version 3.1.x that avoids spurious results.

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