Robert Dillitz created SPARK-55243:
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Summary: Allow binary headers in the Scala Spark Connect client
Key: SPARK-55243
URL: https://issues.apache.org/jira/browse/SPARK-55243
Project: Spark
Issue Type: Improvement
Components: Connect
Affects Versions: 4.1.1
Reporter: Robert Dillitz
Fix For: 4.1.2, 4.2
The Scala Spark Connect client currently only allows setting ASCII headers and
fails if one tries to set a (binary) header with {{-bin}} key suffix:
{code:java}
[info] java.lang.IllegalArgumentException: ASCII header is named test-bin.
Only binary headers may end with -bin
[info] at
com.google.common.base.Preconditions.checkArgument(Preconditions.java:445)
[info] at io.grpc.Metadata$AsciiKey.<init>(Metadata.java:972)
[info] at io.grpc.Metadata$AsciiKey.<init>(Metadata.java:966)
[info] at io.grpc.Metadata$Key.of(Metadata.java:708)
[info] at io.grpc.Metadata$Key.of(Metadata.java:704)
[info] at
org.apache.spark.sql.connect.client.SparkConnectClient$MetadataHeaderClientInterceptor$$anon$2.$anonfun$start$1(SparkConnectClient.scala:1112)
[info] at
org.apache.spark.sql.connect.client.SparkConnectClient$MetadataHeaderClientInterceptor$$anon$2.$anonfun$start$1$adapted(SparkConnectClient.scala:1106)
[info] at scala.collection.immutable.Map$Map1.foreach(Map.scala:278)
[info] at
org.apache.spark.sql.connect.client.SparkConnectClient$MetadataHeaderClientInterceptor$$anon$2.start(SparkConnectClient.scala:1106)
[info] at io.grpc.stub.ClientCalls.startCall(ClientCalls.java:435)
{code}
Improvement: Automatically use {{Metadata.BINARY_BYTE_MARSHALLER}} for {{-bin}}
keys, assuming base64 encoded value strings in the Scala Spark Connect client.
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