spark处理1153194条记录的mysql表，怎么就内存泄露？

[caosw2005]

from pyspark import SparkContext, SparkConf
from pyspark.sql import SQLContext

sc = SparkContext("local", "Simple App")

sqlContext = SQLContext(sc)

url = \
"jdbc:mysql://localhost:3306/stock_data?user=root&password=test"

df = sqlContext \
.read \
.format("jdbc") \
.option("url", url) \
.option("dbtable", "stock_detail_collect") \
.load()

df.printSchema()

counts = df.groupBy("stock_id").count()
counts.show()

===========
怎么数据表只有1153194条记录，怎么运行以上代码就内存泄露：
16/02/05 23:30:28 WARN TaskMemoryManager: leak 8.3 MB memory from org.apache.spark.unsafe.map.BytesToBytesMap@431395b1
16/02/05 23:30:28 ERROR Executor: Managed memory leak detected; size = 8650752 bytes, TID = 1
环境：spark-1.6.0-bin-hadoop2.6
Ubuntu 14.04.3 LTS
jdk1.8.0_66
不知问题在哪？怎么破，非常感谢

[caosw2005]

counts = df.groupBy("stock_id").count() counts.show() 改为写入文件： df.registerTempTable("people") count = sqlContext.sql("select stock_id, count(*) as c from people group by stock_id order by stock_id") for name in count.collect(): file_output.write(str(name)) file_output.flush() file_output.close()