Zhangyx39 commented on a change in pull request #1426:
URL: https://github.com/apache/samza/pull/1426#discussion_r485995739
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File path:
samza-core/src/main/java/org/apache/samza/serializers/IntermediateMessageSerde.java
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@@ -83,21 +83,17 @@ public Object fromBytes(byte[] bytes) {
throw new UnsupportedOperationException(String.format("Message type
%s is not supported", type.name()));
}
return object;
-
} catch (UnsupportedOperationException ue) {
throw new SamzaException(ue);
} catch (Exception e) {
// This will catch the following exceptions:
// 1) the first byte is not a valid type so it will cause
ArrayOutOfBound exception
// 2) the first byte happens to be a valid type, but the deserialization
fails with certain exception
- // For these cases, we fall back to user-provided serde
- try {
- return userMessageSerde.fromBytes(bytes);
- } catch (Exception umse) {
- LOGGER.error("Error deserializing from both intermediate message serde
and user message serde. "
- + "Original exception: ", e);
- throw umse;
- }
+ // For these cases, we WILL NOT fall back to user-provided serde. Thus,
we are not compatible with upgrade
+ // directly from samza version older than 0.13.1.
+ LOGGER.error("Error deserializing with intermediate message serde. If
you are upgrading from samza version older"
+ + " than 0.13.1, please upgrade to samza 1.5 first.");
Review comment:
Good suggestion. I have removed this error log and added a new exception
when failing to read the message type. Also added comments to explain what's
the issue and how to solve it.
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