kbendick commented on a change in pull request #2792:
URL: https://github.com/apache/iceberg/pull/2792#discussion_r667174160
##########
File path: spark/src/main/java/org/apache/iceberg/spark/SparkUtil.java
##########
@@ -99,4 +103,30 @@ public static void
validatePartitionTransforms(PartitionSpec spec) {
}
}
}
+
+ /**
+ * Pulls any Catalog specific overrides for the Hadoop conf from the current
SparkSession, which can be
+ * set via spark.sql.catalog.$catalogName.hadoop.*
+ *
+ * The SparkCatalog allows for hadoop configurations to be overridden per
catalog, by setting
+ * them on the SQLConf, where the following will add the property
"fs.default.name" with value
+ * "hdfs://hanksnamenode:8020" to the catalog's hadoop configuration.
+ * SparkSession.builder()
+ * .config(s"spark.sql.catalog.$catalogName.hadoop.fs.default.name",
"hdfs://hanksnamenode:8020")
+ * .getOrCreate()
+ * @param spark The current Spark session
+ * @param catalogName Name of the catalog to find overrides for.
+ * @return the Hadoop Configuration that should be used for this catalog,
with catalog specific overrides applied.
+ */
+ public static Configuration hadoopConfCatalogOverrides(SparkSession spark,
String catalogName) {
+ // Find keys for the catalog intended to be hadoop configurations
+ final String hadoopConfCatalogPrefix = String.format("%s.%s.%s",
ICEBERG_CATALOG_PREFIX, catalogName, "hadoop.");
+ Configuration conf = spark.sessionState().newHadoopConf();
+ spark.sqlContext().conf().settings().forEach((k, v) -> {
+ if (v != null && k.startsWith(hadoopConfCatalogPrefix)) {
Review comment:
I was able to put a `null` key into a `scala.Map[String, String]`.
```
scala> val nullString: String = null
nullString: String = null
scala> x += nullString -> "5"
res3: scala.collection.mutable.Map[String,String] = Map(null -> 5)
```
However, putting a `null` key into the hadoop configuration throws:
```
scala> val config = spark.sessionState.newHadoopConf
config: org.apache.hadoop.conf.Configuration = Configuration:
core-default.xml, core-site.xml, mapred-default.xml, mapred-site.xml,
yarn-default.xml, yarn-site.xml, hdfs-default.xml, hdfs-site.xml,
__spark_hadoop_conf__.xml
scala> config.set(null, "10")
java.lang.IllegalArgumentException: Property name must not be null
at
com.google.common.base.Preconditions.checkArgument(Preconditions.java:92)
at org.apache.hadoop.conf.Configuration.set(Configuration.java:1353)
at org.apache.hadoop.conf.Configuration.set(Configuration.java:1337)
... 47 elided
```
I think that `spark.sqlContext().conf().settings()` shouldn't return a
`null` key, but I can add a check just in case if we think it's a good idea.
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