Spark Kryo 注册数组 class

Spark Kryo register for array class

我正在尝试用数组注册一个 class(激活 Kryo 的 Spark Java),日志显示一条​​明确的消息:

Class is not registered: org.apache.spark.sql.execution.datasources.InMemoryFileIndex$SerializableBlockLocation[]

我写了几个组合,但是这些都不行:

        kryo.register(Class.forName("org.apache.spark.sql.execution.datasources.InMemoryFileIndex$SerializableBlockLocation[]")); // ERROR
        kryo.register(Class.forName("org.apache.spark.sql.execution.datasources.InMemoryFileIndex$SerializableBlockLocation[].class")); // ERROR
        kryo.register(Class.forName("org.apache.spark.sql.execution.datasources.InMemoryFileIndex$SerializableBlockLocation$Array")); // ERROR
        kryo.register(Class.forName("[org.apache.spark.sql.execution.datasources.InMemoryFileIndex$SerializableBlockLocation")); // ERROR
        kryo.register(Class.forName("[Lorg.apache.spark.sql.execution.datasources.InMemoryFileIndex$SerializableBlockLocation")); // ERROR
        kryo.register(Class.forName("Array[org.apache.spark.sql.execution.datasources.InMemoryFileIndex$SerializableBlockLocation]")); // ERROR
        kryo.register(Class.forName("[[org.apache.spark.sql.execution.datasources.InMemoryFileIndex$SerializableBlockLocation"));  // ERROR

我也试过在没有 Class.forName 的情况下写一个注册 class 但是 Java 无法解析符号 InMemoryFileIndex$SerializableBlockLocation:

kryo.register(org.apache.spark.sql.execution.datasources.InMemoryFileIndex$SerializableBlockLocation[].class);

所有其他 classes 在我的 KryoRegister.class 中工作。

我发现了一个类似的问题here,试试:

kryo.register(Array.newInstance(Class.forName("org.apache.spark.sql.execution.datasources.InMemoryFileIndex$SerializableBlockLocation"), 0)
                        .getClass());

发现你也可以试试:

spark.kryo.classesToRegister [Lorg.apache.spark.sql.execution.datasources.SerializableBlockLocation;

注册"org.apache.spark.sql.execution.datasources.SerializableBlockLocation[]"