[NIFI-3894] NiFi Crashes with OOM if compression is enabled on an RPG with high number of FlowFiles

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.1.0, 1.2.0
• Fix Version/s: 1.3.0
• Component/s: Core Framework
• Assignee: Koji Kawamura
• Reporter: Koji Kawamura
• Created: 14/May/17 23:48
• Updated: 18/May/17 03:56
• Resolved: 18/May/17 03:56

Description

RemoteProcessGroup can be configured to use compression per port. OutOfMemoryError occurred with a large amount of FlowFiles queued in an output port and a NiFi S2S client pulled those via RPG with compression enabled. Without compression, the same amount of FlowFiles can be transferred without issue. Here is the stack trace:

2017-04-06 18:21:59,063 WARN [Timer-Driven Process Thread-5] o.a.n.c.t.ContinuallyRunConnectableTask StandardRootGroupPort[id=cc3ad50e-0159-1000-0000-00001c8cf0ef] Administratively Pausing for 10 seconds due to processing failure: java.lang.OutOfMemoryError 
java.lang.OutOfMemoryError: null 
at java.util.zip.Deflater.init(Native Method) ~[na:1.8.0_77] 
at java.util.zip.Deflater.<init>(Deflater.java:171) ~[na:1.8.0_77] 
at java.util.zip.Deflater.<init>(Deflater.java:180) ~[na:1.8.0_77] 
at org.apache.nifi.remote.io.CompressionOutputStream.<init>(CompressionOutputStream.java:54) ~[nifi-utils-1.1.0.2.1.1.0-2.jar:1.1.0.2.1.1.0-2] 

It happens because CompressionOutputStream.close does not call end() method of a Deflater It calls resets() but not end().
https://github.com/apache/nifi/blob/master/nifi-commons/nifi-utils/src/main/java/org/apache/nifi/remote/io/CompressionOutputStream.java#L141

The issue is the same with this:
JDK-4797189 : Finalizers not called promptly enough
http://bugs.java.com/view_bug.do?bug_id=4797189

WORK AROUND
Invoke "end()" on any Inflator or Deflator once it is no longer in use. This will clean up the process space (non Java/GC) memory.

Issue Links

• links to: GitHub Pull Request #1796
• links to: GitHub Pull Request #1820