GitHub user HyukjinKwon opened a pull request:
https://github.com/apache/spark/pull/17282
[SPARK-19872][PYTHON] Only reseralize BatchedSerializers when repartitioning
## What changes were proposed in this pull request?
This PR proposes to avoid serialization for non-batched ones. It seems
`UTF8Deserializer` can't be replaced with `BatchedSerializer`.
with the file, `text.txt` below:
```
a
b
d
e
f
g
h
i
j
k
l
```
- Before
```python
>>> sc.textFile('text.txt').repartition(1).collect()
```
```
UTF8Deserializer(True)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File ".../spark/python/pyspark/rdd.py", line 811, in collect
return list(_load_from_socket(port, self._jrdd_deserializer))
File ".../spark/python/pyspark/serializers.py", line 549, in load_stream
yield self.loads(stream)
File ".../spark/python/pyspark/serializers.py", line 544, in loads
return s.decode("utf-8") if self.use_unicode else s
File
"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/encodings/utf_8.py",
line 16, in decode
return codecs.utf_8_decode(input, errors, True)
UnicodeDecodeError: 'utf8' codec can't decode byte 0x80 in position 0:
invalid start byte
```
- After
```python
>>> sc.textFile('text.txt').repartition(1).collect()
```
```
[u'a', u'b', u'', u'd', u'e', u'f', u'g', u'h', u'i', u'j', u'k', u'l', u'']
```
## How was this patch tested?
Unit test in `python/pyspark/tests.py`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/HyukjinKwon/spark SPARK-19872
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17282.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #17282
----
commit 30688db6520846ac561d117a3af31c947b33a498
Author: hyukjinkwon <[email protected]>
Date: 2017-03-13T18:27:06Z
Do not use batch when it is not needed
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