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https://issues.apache.org/jira/browse/BEAM-9144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17020344#comment-17020344
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Aaron Dixon commented on BEAM-9144:
-----------------------------------
[~suztomo] This appears to be a runner issue:
The exception (class load) is not occurring from my code but from the Dataflow
runner system, from `StreamingDataflowWorker` class.
* beam-2.16.0 transitively includes `org.apache.beam.vendor.grpc.v1p21p0.*`
packages.
* The Dataflow runtime attempts to load v1p21p0 classes and finds them
present.
* beam-2.20.0-SNAPS transitively includes
`org.apache.beam.vendor.grpc.v1p26p0.*` packages (_not_ v1p21p0 classes).
* Dataflow's runtime system tries to load `*.v1p21p0.*` but no longer finds
them present. I expect it _should_ be attempting to load `*.v1p26p0.*` classes
when the SDK version is 2.20.0-* .
Thoughts?
> Beam's own Avro TimeConversion class in beam-sdk-java-core
> -----------------------------------------------------------
>
> Key: BEAM-9144
> URL: https://issues.apache.org/jira/browse/BEAM-9144
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Tomo Suzuki
> Assignee: Tomo Suzuki
> Priority: Major
> Fix For: 2.19.0
>
> Attachments: avro-beam-dependency-graph.png
>
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> From Aaron's comment in
> https://issues.apache.org/jira/browse/BEAM-8388?focusedCommentId=17016476&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17016476
> .
> {quote}My org must use Avro 1.9.x (due to some Avro schema resolution issues
> resolved in 1.9.x) so downgrading Avro is not possible for us.
> Beam 2.16.0 is compatible with our usage of Avro 1.9.x – but upgrading to
> 2.17.0 we are broken as 2.17.0 links to Java classes in Avro 1.8.x that are
> not available in 1.9.x.
> {quote}
> The Java class is
> {{org.apache.avro.data.TimeConversions.TimestampConversion}} in Avro 1.8.
> It's renamed to {{org.apache.avro.data.JodaTimeConversions}} in Avro 1.9.
> h1. Beam Java SDK cannot upgrade Avro to 1.9
> Beam has Spark runners and Spark has not yet upgraded to Avro 1.9.
> Illustration of the dependency
> !avro-beam-dependency-graph.png|width=799,height=385!
> h1. Short-term Solution
> As illustrated above, as long as Beam Java SDK uses only the intersection of
> Avro classes, method, and fields between Avro 1.8 and 1.9, it will provide
> flexibility in runtime Avro versions (as it did until Beam 2.16).
> h2. Difference of the TimeConversion Classes
> Avro 1.9's TimestampConversion overrides {{getRecommendedSchema}} method.
> Details below:
> Avro 1.8's TimeConversions.TimestampConversion:
> {code:java}
> public static class TimestampConversion extends Conversion<DateTime> {
> @Override
> public Class<DateTime> getConvertedType() {
> return DateTime.class;
> }
> @Override
> public String getLogicalTypeName() {
> return "timestamp-millis";
> }
> @Override
> public DateTime fromLong(Long millisFromEpoch, Schema schema, LogicalType
> type) {
> return new DateTime(millisFromEpoch, DateTimeZone.UTC);
> }
> @Override
> public Long toLong(DateTime timestamp, Schema schema, LogicalType type) {
> return timestamp.getMillis();
> }
> }
> {code}
> Avro 1.9's JodaTimeConversions.TimestampConversion:
> {code:java}
> public static class TimestampConversion extends Conversion<DateTime> {
> @Override
> public Class<DateTime> getConvertedType() {
> return DateTime.class;
> }
> @Override
> public String getLogicalTypeName() {
> return "timestamp-millis";
> }
> @Override
> public DateTime fromLong(Long millisFromEpoch, Schema schema, LogicalType
> type) {
> return new DateTime(millisFromEpoch, DateTimeZone.UTC);
> }
> @Override
> public Long toLong(DateTime timestamp, Schema schema, LogicalType type) {
> return timestamp.getMillis();
> }
> @Override
> public Schema getRecommendedSchema() {
> return
> LogicalTypes.timestampMillis().addToSchema(Schema.create(Schema.Type.LONG));
> }
> }
> {code}
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