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From Divya Gehlot <divya.htco...@gmail.com>
Subject [Spark-1.5.2]Spark Memory Issue while Saving to HDFS and Pheonix both
Date Fri, 01 Apr 2016 10:35:22 GMT
[image: Mic Drop]
Hi,
I have Hadoop Hortonworks  3 NODE  Cluster on EC2 with
*Hadoop *version 2.7.x
*Spark *version - 1.5.2
*Phoenix *version - 4.4
*Hbase *version 1.1.x

*Cluster Statistics *
Date Node 1
OS: redhat7 (x86_64)Cores (CPU): 2 (2)Disk: 20.69GB/99.99GB (20.69% used)
Memory: 7.39GB
Date Node 2
Cores (CPU): 2 (2)Disk: 20.73GB/99.99GB (20.73% used)Memory: 7.39GBLoad Avg:
 0.00Heartbeat: a moment agoCurrent Version: 2.3.4.0-3485*NameNode*Rack:
 /default-rack OS: redhat7 (x86_64)Cores (CPU): 4 (4)Disk: 32.4GB/99.99GB
(32.4% used)Memory: 15.26GBLoad Avg: 0.78Heartbeat: a moment agoCurrent
Version: 2.3.4.0-3485

*Spark Queue Statistics *

> Queue State: RUNNING
> Used Capacity: 0.0%
> Configured Capacity: 100.0%
> Configured Max Capacity: 100.0%
> Absolute Used Capacity: 0.0%
> Absolute Configured Capacity: 100.0%
> Absolute Configured Max Capacity: 100.0%
> Used Resources: <memory:0, vCores:0>
> Num Schedulable Applications: 0
> Num Non-Schedulable Applications: 0
> Num Containers: 0
> Max Applications: 10000
> Max Applications Per User: 10000
> Max Application Master Resources: <memory:3072, vCores:1>
> Used Application Master Resources: <memory:0, vCores:0>
> Max Application Master Resources Per User: <memory:3072, vCores:1>
> Configured Minimum User Limit Percent: 100%
> Configured User Limit Factor: 1.0
> Accessible Node Labels: *
> Ordering Policy: FifoOrderingPolicy
> Preemption: disabled



I have spark scala script
which is doing many operations like reading from
DB(Phoenix),Join-Inner,LeftOuter join),unionAll and finally groupBy and
saving the result set to Phoenix/HDFS
Have created almost 20+ Dataframes for mentioned above operations.

stackTrace :

> 16/04/01 10:11:49 WARN TaskSetManager: Lost task 3.0 in stage 132.4 (TID
> 18401, ip-xxx-xx-xx-xxx.ap-southeast-1.compute.internal):
> java.lang.OutOfMemoryError: PermGen space
>         at sun.misc.Unsafe.defineClass(Native Method)
>         at sun.reflect.ClassDefiner.defineClass(ClassDefiner.java:63)
>         at
> sun.reflect.MethodAccessorGenerator$1.run(MethodAccessorGenerator.java:399)
>         at
> sun.reflect.MethodAccessorGenerator$1.run(MethodAccessorGenerator.java:396)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at
> sun.reflect.MethodAccessorGenerator.generate(MethodAccessorGenerator.java:395)
>         at
> sun.reflect.MethodAccessorGenerator.generateSerializationConstructor(MethodAccessorGenerator.java:113)
>         at
> sun.reflect.ReflectionFactory.newConstructorForSerialization(ReflectionFactory.java:331)
>         at
> java.io.ObjectStreamClass.getSerializableConstructor(ObjectStreamClass.java:1376)
>         at java.io.ObjectStreamClass.access$1500(ObjectStreamClass.java:72)
>         at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:493)
>         at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:468)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:468)
>         at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:365)
>         at
> java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:602)
>         at
> java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1622)
>         at
> java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1517)
>         at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)




For Phoenix : I am getting similar to below error in my stack trace

>
> $provider.DefaultSource does not allow user-specified schemas


The whole job is taking almost 3-4 minutes and for saving itself its taking
3-4 minutes whether it is Phoenix /HDFS

Could somebody help me resolving the above mentioned issue.

Would really appreciate the help.


Thanks,

Divya

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