Nishith Agarwal created HUDI-1906:
-------------------------------------
Summary: Deltastreamer/SparkDatasource ingestion breaks when
changing target schema provider options
Key: HUDI-1906
URL: https://issues.apache.org/jira/browse/HUDI-1906
Project: Apache Hudi
Issue Type: Improvement
Components: DeltaStreamer
Reporter: Nishith Agarwal
Currently, there are few different options to the user to provide target
schemas such as file based, schema registry. At a high level, there are 2 main
flows
# Target Schema is provided by the user
# Target schema is not provided by the user (which is then inferred from the
incoming data)
||Schema post processor enabled||Transformers||User provided target schema||Cur
behavior||
|yes|No|Yes|table schema's has no namespace. matches user provided schema|
|yes|yes|No|had to make minor fix in post processor for NPE. with the fix,
table schema has namespace in it.|
|yes|yes|yes|table schema has namespace|
|no|no|yes|table schema's has no namespace. matches user provided schema|
|no|yes|yes|table schema's has no namespace. matches user provided schema|
|no|yes|no|table's schema has namespace.|
Source -> [https://github.com/apache/hudi/pull/2937]
As you can see above, if one switches from a non-user-provided schema flow to a
user-provided-schema flow, we switch from namespace in schema to no namespace
in schema.
Parquet does not store the namespace, so when moving across avro schemas with
and without namespace, the parquet-avro writer or reader does not complain
since parquet itself does not store namespace.
However, for MergeOnRead tables, we serialize data and schema in the log
blocks. The GenericDatumReader that takes a reader & writer schema to translate
breaks when one schema has namespace while the other doesn't.
The following exception is thrown
{noformat}
51511 [Executor task launch worker for task 502] ERROR
org.apache.hudi.common.table.log.AbstractHoodieLogRecordScanner - Got
exception when reading log file
org.apache.avro.AvroTypeException: Found
hoodie.source.hoodie_source.height.fixed, expecting fixed
at
org.apache.avro.io.ResolvingDecoder.doAction(ResolvingDecoder.java:292)
at org.apache.avro.io.parsing.Parser.advance(Parser.java:88)
at
org.apache.avro.io.ValidatingDecoder.checkFixed(ValidatingDecoder.java:135)
at
org.apache.avro.io.ValidatingDecoder.readFixed(ValidatingDecoder.java:146)
at
org.apache.avro.generic.GenericDatumReader.readFixed(GenericDatumReader.java:342)
at
org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:180)
at
org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:153)
at
org.apache.avro.generic.GenericDatumReader.readField(GenericDatumReader.java:232)
at
org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:222)
at
org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:175)
at
org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:153)
at
org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:145)
at
org.apache.hudi.common.table.log.block.HoodieAvroDataBlock.deserializeRecords(HoodieAvroDataBlock.java:157)
at
org.apache.hudi.common.table.log.block.HoodieDataBlock.createRecordsFromContentBytes(HoodieDataBlock.java:128)
at
org.apache.hudi.common.table.log.block.HoodieDataBlock.getRecords(HoodieDataBlock.java:106)
at
org.apache.hudi.common.table.log.AbstractHoodieLogRecordScanner.processDataBlock(AbstractHoodieLogRecordScanner.java:275)
at
org.apache.hudi.common.table.log.AbstractHoodieLogRecordScanner.processQueuedBlocksForInstant(AbstractHoodieLogRecordScanner.java:308)
at
org.apache.hudi.common.table.log.AbstractHoodieLogRecordScanner.scan(AbstractHoodieLogRecordScanner.java:241)
at
org.apache.hudi.common.table.log.HoodieMergedLogRecordScanner.<init>(HoodieMergedLogRecordScanner.java:81)
at
org.apache.hudi.HoodieMergeOnReadRDD$.scanLog(HoodieMergeOnReadRDD.scala:259)
at
org.apache.hudi.HoodieMergeOnReadRDD$$anon$2.<init>(HoodieMergeOnReadRDD.scala:164)
at
org.apache.hudi.HoodieMergeOnReadRDD.payloadCombineFileIterator(HoodieMergeOnReadRDD.scala:154)
at
org.apache.hudi.HoodieMergeOnReadRDD.compute(HoodieMergeOnReadRDD.scala:67)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:324)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:288)
at
org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:52)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:324)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:288)
at
org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:52)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:324)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:288)
at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:99)
at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:55)
at org.apache.spark.scheduler.Task.run(Task.scala:123)
at
org.apache.spark.executor.Executor$TaskRunner$$anonfun$10.apply(Executor.scala:408)
at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1360)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:414)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748{noformat}
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