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From 陈哲 <>
Subject Spark ML OOM problem
Date Wed, 12 Oct 2016 07:24:28 GMT
    I'm using spark ml to train RandomForest Model . There is about over 200,
000 lines in the training data file  and about 100 features. I'm running
spark in local mode and with JAVA_OPTS like: -Xms1024m -Xmx10296m
 -XX:+PrintGCDetails -XX:+PrintGCTimeStamps, but OOM error keep coming out,
I tried with spark configuration change to avoid this but failed.
My spark conf:


*spark.executor.instances: 16*

*spark.executor.heartbeatInterval:120   *
spark.ui.retainedJobs=0 ...  // I put all the similar conf to 0
, spark.ui.retainedStages ...

Here is some GC log:
4876.028: [Full GC [PSYoungGen: 439296K->417358K(878592K)] [ParOldGen:
9139497K->9139487K(9225216K)] 9578793K->9556845K(10103808K) [PSPermGen:
81436K->81436K(81920K)], 2.0203540 secs] [Times: user=49.85 sys=0.12,
real=2.02 secs]
4878.100: [Full GC [PSYoungGen: 417930K->187983K(878592K)] [ParOldGen:
9139487K->9166111K(9225216K)] 9557418K->9354094K(10103808K) [PSPermGen:
81436K->81436K(81920K)], 4.2368530 secs] [Times: user=53.77 sys=0.09,
real=4.23 secs]
4882.414: [Full GC [PSYoungGen: 428018K->202158K(878592K)] [ParOldGen:
9211167K->9196569K(9225216K)] 9639185K->9398727K(10103808K) [PSPermGen:
81436K->81436K(81920K)], 4.4419950 secs] [Times: user=54.75 sys=0.08,
real=4.44 secs]
4886.886: [Full GC [PSYoungGen: 425657K->397128K(878592K)] [ParOldGen:
9196569K->9196568K(9225216K)] 9622227K->9593697K(10103808K) [PSPermGen:
81436K->81436K(81920K)], 2.3522140 secs] [Times: user=51.41 sys=0.09,
real=2.35 secs]
4889.239: [Full GC [PSYoungGen: 397128K->397128K(878592K)] [ParOldGen:
9196568K->9196443K(9225216K)] 9593697K->9593572K(10103808K) [PSPermGen:
81436K->81289K(81408K)], 30.5637160 secs] [Times: user=767.29 sys=2.98,
real=30.57 secs]

the Full GC failed to collect enough memory , so OOM

I have two questions :
1. why spark log always show free memory like:
4834409 [dispatcher-event-loop-5] INFO - Removed broadcast_266_piece0 on in memory (size: 642.5 KB, free: 7.1 GB)
Is this Wrong ?

2. How to avoid OOM here ? do I have to increase -Xmx to large value ? How
does spark use these memory , what's in those memory ? anyone can guide to
some docs ?



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