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| author | Davies Liu <davies@databricks.com> | 2014-11-18 16:17:51 -0800 |
|---|---|---|
| committer | Josh Rosen <joshrosen@databricks.com> | 2014-11-18 16:18:20 -0800 |
| commit | bb7a173d95094b63981724c381f68a885e514cd4 (patch) | |
| tree | ec8a64d7f52816a46618d2557186e50229788293 /python/pyspark/context.py | |
| parent | 4ae78abe66e593ac8bf9de37eca80413730c431b (diff) | |
| download | spark-bb7a173d95094b63981724c381f68a885e514cd4.tar.gz spark-bb7a173d95094b63981724c381f68a885e514cd4.tar.bz2 spark-bb7a173d95094b63981724c381f68a885e514cd4.zip | |
[SPARK-3721] [PySpark] broadcast objects larger than 2G
This patch will bring support for broadcasting objects larger than 2G.
pickle, zlib, FrameSerializer and Array[Byte] all can not support objects larger than 2G, so this patch introduce LargeObjectSerializer to serialize broadcast objects, the object will be serialized and compressed into small chunks, it also change the type of Broadcast[Array[Byte]]] into Broadcast[Array[Array[Byte]]]].
Testing for support broadcast objects larger than 2G is slow and memory hungry, so this is tested manually, could be added into SparkPerf.
Author: Davies Liu <davies@databricks.com>
Author: Davies Liu <davies.liu@gmail.com>
Closes #2659 from davies/huge and squashes the following commits:
7b57a14 [Davies Liu] add more tests for broadcast
28acff9 [Davies Liu] Merge branch 'master' of github.com:apache/spark into huge
a2f6a02 [Davies Liu] bug fix
4820613 [Davies Liu] Merge branch 'master' of github.com:apache/spark into huge
5875c73 [Davies Liu] address comments
10a349b [Davies Liu] address comments
0c33016 [Davies Liu] Merge branch 'master' of github.com:apache/spark into huge
6182c8f [Davies Liu] Merge branch 'master' into huge
d94b68f [Davies Liu] Merge branch 'master' of github.com:apache/spark into huge
2514848 [Davies Liu] address comments
fda395b [Davies Liu] Merge branch 'master' of github.com:apache/spark into huge
1c2d928 [Davies Liu] fix scala style
091b107 [Davies Liu] broadcast objects larger than 2G
(cherry picked from commit 4a377aff2d36b64a65b54192a987aba44b8f78e0)
Signed-off-by: Josh Rosen <joshrosen@databricks.com>
Diffstat (limited to 'python/pyspark/context.py')
| -rw-r--r-- | python/pyspark/context.py | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/python/pyspark/context.py b/python/pyspark/context.py index b6c991453d..ec67ec8d0f 100644 --- a/python/pyspark/context.py +++ b/python/pyspark/context.py @@ -29,7 +29,7 @@ from pyspark.conf import SparkConf from pyspark.files import SparkFiles from pyspark.java_gateway import launch_gateway from pyspark.serializers import PickleSerializer, BatchedSerializer, UTF8Deserializer, \ - PairDeserializer, CompressedSerializer, AutoBatchedSerializer, NoOpSerializer + PairDeserializer, AutoBatchedSerializer, NoOpSerializer, LargeObjectSerializer from pyspark.storagelevel import StorageLevel from pyspark.rdd import RDD from pyspark.traceback_utils import CallSite, first_spark_call @@ -624,7 +624,8 @@ class SparkContext(object): object for reading it in distributed functions. The variable will be sent to each cluster only once. """ - ser = CompressedSerializer(PickleSerializer()) + ser = LargeObjectSerializer() + # pass large object by py4j is very slow and need much memory tempFile = NamedTemporaryFile(delete=False, dir=self._temp_dir) ser.dump_stream([value], tempFile) |