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https://issues.apache.org/jira/browse/HUDI-603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17043016#comment-17043016
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Yixue (Andrew) Zhu edited comment on HUDI-603 at 2/23/20 6:36 PM:
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I am still working on reading Hudi code base, but I think one possible approach
would work:
# A SchemaProvider derived class can be introduced to retrieve latest Schema
if needed, from Confluence Schema registry.
# Enhance class AvroSource or Source derived class to record Avro schema id
for serialization, as used by Confluence Schema registry. When deserialized
from Kafka, or for compaction, translate to refreshed schema (shortcut if
schema ids match), snapshot by HoodieWriteHandle (or derived) class, from
SchemaProvider.
# Custom serializer for GenericRecord can be registered in Spark, to use
schema id.
was (Author: [email protected]):
I am still working on reading Hudi code base, but I think one possible approach
would work:
# A SchemaProvider derived class can be introduced to retrieve latest Schema
if needed, from Confluence Schema registry.
# Enhance class AvroSource or Source derived class to record Avro schema id
for serialization, as used by Confluence Schema registry. When deserialized for
compaction, translate to refreshed schema (shortcut if schema ids match),
snapshot by HoodieWriteHandle (or derived) class, from SchemaProvider.
# Custom serializer for GenericRecord can be registered in Spark, to use
schema id.
> HoodieDeltaStreamer should periodically fetch table schema update
> -----------------------------------------------------------------
>
> Key: HUDI-603
> URL: https://issues.apache.org/jira/browse/HUDI-603
> Project: Apache Hudi (incubating)
> Issue Type: Bug
> Components: DeltaStreamer
> Reporter: Yixue Zhu
> Priority: Major
> Labels: evolution, schema
>
> HoodieDeltaStreamer create SchemaProvider instance and delegate to DeltaSync
> for periodical sync. However, default implementation of SchemaProvider does
> not refresh schema, which can change due to schema evolution. DeltaSync
> snapshot the schema when it creates writeClient, using the SchemaProvider
> instance or pick up from source, and the schema for writeClient is not
> refreshed during the loop of Sync.
> I think this needs to be addressed to support schema evolution fully.
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