[HADOOP-11098] [JDK8] Max Non Heap Memory default changed between JDK7 and 8

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.3.0, 2.7.1
• Fix Version/s: 2.8.0, 3.0.0-alpha1

Environment

JDK8

• Target Version/s: 2.8.0
• Hadoop Flags: Reviewed
• Assignee: Tsuyoshi Ozawa
• Reporter: Travis Thompson
• Created: 17/Sep/14 00:28
• Updated: 15/Jun/22 23:54
• Resolved: 04/Oct/15 23:18

Description

I noticed this because the NameNode UI shows "Max Non Heap Memory" which after some digging I found correlates to MaxDirectMemorySize.

JDK7

Heap Memory used 16.75 GB of 23 GB Heap Memory. Max Heap Memory is 23.7 GB.
Non Heap Memory used 57.32 MB of 67.38 MB Commited Non Heap Memory. Max Non Heap Memory is 130 MB. 

JDK8

Heap Memory used 3.02 GB of 7.65 GB Heap Memory. Max Heap Memory is 23.7 GB.
Non Heap Memory used 103.12 MB of 104.41 MB Commited Non Heap Memory. Max Non Heap Memory is -1 B. 

More information in first comment.

Issue Links

• is duplicated by: HDFS-8464 hdfs namenode UI shows "Max Non Heap Memory" is -1 B
• is related to: HDFS-11271 Typo in NameNode UI
• relates to: HADOOP-11090 [Umbrella] Support Java 8 in Hadoop
• relates to: HBASE-7608 Considering Java 8