[HDFS-4408] Balancer for DataNode's Volumes

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Component/s: datanode
• Assignee: Unassigned
• Reporter: Li Junjun
• Created: 16/Jan/13 05:31
• Updated: 16/Jan/13 16:38
• Resolved: 16/Jan/13 08:57

Description

After a long time , I found some datanode :
Volume a,b,c,d their and total space and configurations are same.
but a used 100% , b c d are not , may be casued by write and delete files mega times .

so it'll be better to write a balancer for datanode's volumes to improve the cluster's write performance;

before balance : 4 write request ,3 volumes handles.
after balance : 4 write request ,4 volumes handles.
and in most cases, compute follows write , and it'll improve the read performance;

Issue Links

• duplicates: HDFS-1312 Re-balance disks within a Datanode