George Papa created SPARK-29321:
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Summary: CLONE - Possible memory leak in Spark
Key: SPARK-29321
URL: https://issues.apache.org/jira/browse/SPARK-29321
Project: Spark
Issue Type: Bug
Components: Block Manager, Spark Core
Affects Versions: 2.3.3
Reporter: George Papa
Assignee: Jungtaek Lim
Fix For: 2.4.5, 3.0.0
I used Spark 2.1.1 and I upgraded into new versions. After Spark version 2.3.3,
I observed from Spark UI that the driver memory is{color:#ff0000} increasing
continuously.{color}
In more detail, the driver memory and executors memory have the same used
memory storage and after each iteration the storage memory is increasing. You
can reproduce this behavior by running the following snippet code. The
following example, is very simple, without any dataframe persistence, but the
memory consumption is not stable as it was in former Spark versions
(Specifically until Spark 2.3.2).
Also, I tested with Spark streaming and structured streaming API and I had the
same behavior. I tested with an existing application which reads from Kafka
source and do some aggregations, persist dataframes and then unpersist them.
The persist and unpersist it works correct, I see the dataframes in the storage
tab in Spark UI and after the unpersist, all dataframe have removed. But, after
the unpersist the executors memory is not zero, BUT has the same value with the
driver memory. This behavior also affects the application performance because
the memory of the executors is increasing as the driver increasing and after a
while the persisted dataframes are not fit in the executors memory and I have
spill to disk.
Another error which I had after a long running, was
{color:#ff0000}java.lang.OutOfMemoryError: GC overhead limit exceeded, but I
don't know if its relevant with the above behavior or not.{color}
*HOW TO REPRODUCE THIS BEHAVIOR:*
Create a very simple application(streaming count_file.py) in order to reproduce
this behavior. This application reads CSV files from a directory, count the
rows and then remove the processed files.
{code:java}
import time
import os
from pyspark.sql import SparkSession
from pyspark.sql import functions as F
from pyspark.sql import types as T
target_dir = "..."
spark=SparkSession.builder.appName("DataframeCount").getOrCreate()
while True:
for f in os.listdir(target_dir):
df = spark.read.load(target_dir + f, format="csv")
print("Number of records: {0}".format(df.count()))
time.sleep(15){code}
Submit code:
{code:java}
spark-submit
--master spark://xxx.xxx.xx.xxx
--deploy-mode client
--executor-memory 4g
--executor-cores 3
streaming count_file.py
{code}
*TESTED CASES WITH THE SAME BEHAVIOUR:*
* I tested with default settings (spark-defaults.conf)
* Add spark.cleaner.periodicGC.interval 1min (or less)
* {{Turn spark.cleaner.referenceTracking.blocking}}=false
* Run the application in cluster mode
* Increase/decrease the resources of the executors and driver
* I tested with extraJavaOptions in driver and executor -XX:+UseG1GC
-XX:InitiatingHeapOccupancyPercent=35 -XX:ConcGCThreads=12
*DEPENDENCIES*
* Operation system: Ubuntu 16.04.3 LTS
* Java: jdk1.8.0_131 (tested also with jdk1.8.0_221)
* Python: Python 2.7.12
*NOTE:* In Spark 2.1.1 the driver memory consumption (Storage Memory tab) was
extremely low and after the run of ContextCleaner and BlockManager the memory
was decreasing.
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