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https://issues.apache.org/jira/browse/HUDI-1146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17173348#comment-17173348
]
Balaji Varadarajan edited comment on HUDI-1146 at 8/7/20, 5:24 PM:
-------------------------------------------------------------------
[~bdscheller]:
I think InputBatch::getSchemaProvider will be called irrespective of whether
input batch is empty or not. I am suspecting this to be similar to HUDI-1091
where an empty input batch is triggering this case.
Can you try this change ?
```
---
a/hudi-utilities/src/main/java/org/apache/hudi/utilities/deltastreamer/DeltaSync.java
+++
b/hudi-utilities/src/main/java/org/apache/hudi/utilities/deltastreamer/DeltaSync.java
@@ -321,7 +321,7 @@ public class DeltaSync implements Serializable {
.map(r -> (SchemaProvider) new DelegatingSchemaProvider(props, jssc,
dataAndCheckpoint.getSchemaProvider(),
new RowBasedSchemaProvider(r.schema())))
- .orElse(dataAndCheckpoint.getSchemaProvider());
+ .orElseGet((dataAndCheckpoint::getSchemaProvider));
avroRDDOptional = transformed
.map(t -> AvroConversionUtils.createRdd(
t, HOODIE_RECORD_STRUCT_NAME, HOODIE_RECORD_NAMESPACE).toJavaRDD());
```
was (Author: vbalaji):
[~bdscheller]:
I think InputBatch::getSchemaProvider will be called irrespective of whether
input batch is empty or not. I am suspecting this to be similar to HUDI-1091
where an empty input batch is triggering this case.
Can you try this change ?
---
a/hudi-utilities/src/main/java/org/apache/hudi/utilities/deltastreamer/DeltaSync.java
+++
b/hudi-utilities/src/main/java/org/apache/hudi/utilities/deltastreamer/DeltaSync.java
@@ -321,7 +321,7 @@ public class DeltaSync implements Serializable {
.map(r -> (SchemaProvider) new DelegatingSchemaProvider(props, jssc,
dataAndCheckpoint.getSchemaProvider(),
new RowBasedSchemaProvider(r.schema())))
- .orElse(dataAndCheckpoint.getSchemaProvider());
+ .orElseGet((dataAndCheckpoint::getSchemaProvider));
avroRDDOptional = transformed
.map(t -> AvroConversionUtils.createRdd(
t, HOODIE_RECORD_STRUCT_NAME, HOODIE_RECORD_NAMESPACE).toJavaRDD());
> DeltaStreamer fails to start when No updated records + schemaProvider not
> supplied
> ----------------------------------------------------------------------------------
>
> Key: HUDI-1146
> URL: https://issues.apache.org/jira/browse/HUDI-1146
> Project: Apache Hudi
> Issue Type: Bug
> Components: Hive Integration
> Reporter: Brandon Scheller
> Priority: Major
>
> DeltaStreamer issue — happens with both COW or MOR - Restarting the
> DeltaStreamer Process crashes, that is, 2nd Run does nothing.
> Steps:
> Run Hudi DeltaStreamer job in --continuous mode
> Run the same job again without deleting the output parquet files generated
> due to step above
> 2nd run crashes with the below error ( it does not crash if we delete the
> output parquet file)
> {{Caused by: org.apache.hudi.exception.HoodieException: Please provide a
> valid schema provider class!}}
> {{ at
> org.apache.hudi.utilities.sources.InputBatch.getSchemaProvider(InputBatch.java:53)}}
> {{ at
> org.apache.hudi.utilities.deltastreamer.DeltaSync.readFromSource(DeltaSync.java:312)}}
> {{ at
> org.apache.hudi.utilities.deltastreamer.DeltaSync.syncOnce(DeltaSync.java:226)}}
> {{ at
> org.apache.hudi.utilities.deltastreamer.HoodieDeltaStreamer$DeltaSyncService.lambda$startService$0(HoodieDeltaStreamer.java:392)}}
>
> {{This looks to be because of this line:}}
> {{[https://github.com/apache/hudi/blob/master/hudi-utilities/src/main/java/org/apache/hudi/utilities/deltastreamer/DeltaSync.java#L315]
> }}
> The "orElse" block here doesn't seem to make sense as if "transformed" is
> empty then it is likely "dataAndCheckpoint" will have a null schema provider
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