reidy-p opened a new pull request #29918:
URL: https://github.com/apache/spark/pull/29918
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### What changes were proposed in this pull request?
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Adding a method to get the checkpoint directory from the PySpark context to
match the Scala API
### Why are the changes needed?
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To make the Scala and Python APIs consistent and remove the need to use the
JavaObject
### Does this PR introduce _any_ user-facing change?
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Yes, there is a new method which makes it easier to get the checkpoint
directory directly rather than using the JavaObject
#### Previous behaviour:
```python
>>> spark.sparkContext.setCheckpointDir('/tmp/spark/checkpoint/')
>>> sc._jsc.sc().getCheckpointDir().get()
'file:/tmp/spark/checkpoint/63f7b67c-e5dc-4d11-a70c-33554a71717a'
```
This method returns a confusing Scala error if it has not been set
```python
>>> sc._jsc.sc().getCheckpointDir().get()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File
"/home/paul/Desktop/spark/python/lib/py4j-0.10.9-src.zip/py4j/java_gateway.py",
line 1305, in __call__
File "/home/paul/Desktop/spark/python/pyspark/sql/utils.py", line 111, in
deco
return f(*a, **kw)
File
"/home/paul/Desktop/spark/python/lib/py4j-0.10.9-src.zip/py4j/protocol.py",
line 328, in get_return_value
py4j.protocol.Py4JJavaError: An error occurred while calling o25.get.
: java.util.NoSuchElementException: None.get
at scala.None$.get(Option.scala:529)
at scala.None$.get(Option.scala:527)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
at py4j.Gateway.invoke(Gateway.java:282)
at
py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
at py4j.commands.CallCommand.execute(CallCommand.java:79)
at py4j.GatewayConnection.run(GatewayConnection.java:238)
at java.lang.Thread.run(Thread.java:748)
```
#### New method:
```python
>>> spark.sparkContext.setCheckpointDir('/tmp/spark/checkpoint/')
>>> spark.sparkContext.getCheckpointDir()
'file:/tmp/spark/checkpoint/b38aca2e-8ace-44fc-a4c4-f4e36c2da2a7'
```
``getCheckpointDir()`` returns ``None`` if it has not been set
```python
>>> print(spark.sparkContext.getCheckpointDir())
None
```
### How was this patch tested?
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Added to existing unit tests. But I'm not sure how to add a test for the
case where ``getCheckpointDir()`` should return ``None`` since the existing
checkpoint tests set the checkpoint directory in the ``setUp`` method before
any tests are run as far as I can tell.
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