srowen commented on a change in pull request #26895: [SPARK-17398][SQL] Fix 
ClassCastException when querying partitioned JSON table
URL: https://github.com/apache/spark/pull/26895#discussion_r358001218
 
 

 ##########
 File path: sql/hive/src/main/scala/org/apache/spark/sql/hive/TableReader.scala
 ##########
 @@ -132,7 +132,9 @@ class HadoopTableReader(
     val deserializedHadoopRDD = hadoopRDD.mapPartitions { iter =>
       val hconf = broadcastedHadoopConf.value.value
       val deserializer = deserializerClass.getConstructor().newInstance()
-      deserializer.initialize(hconf, localTableDesc.getProperties)
+      DeserializerLock.synchronized {
 
 Review comment:
   Fair enough. Is there any way to fix this in the Hadoop implementation? or 
is it already fixed but we have to deal with it here? 
   Can we push the global lock down further rather than making callers know to 
use it?

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