[HDFS-4630] Datanode is going OOM due to small files in hdfs

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Invalid
• Affects Version/s: 2.0.0-alpha
• Component/s: datanode, namenode

Environment

Ubuntu, Java 1.6

• Assignee: Unassigned
• Reporter: Ankush Bhatiya
• Created: 24/Mar/13 11:40
• Updated: 25/Mar/13 11:50
• Resolved: 24/Mar/13 15:24

Description

Hi,

We have very small files(size ranging 10KB-1MB) in our hdfs and no of files are in tens of millions. Due to this namenode and datanode both going out of memory very frequently. When we analyse the head dump of datanode most of the memory was used by ReplicaMap.

Can we use EhCache or other to not to store all the data in memory?

Thanks
Ankush