Periodic verification at the Datanode
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Key: HADOOP-2012
URL: https://issues.apache.org/jira/browse/HADOOP-2012
Project: Hadoop
Issue Type: New Feature
Reporter: Raghu Angadi
Assignee: Raghu Angadi
Currently on-disk data corruption on data blocks is detected only when it is
read by the client or by another datanode. These errors are detected much
earlier if datanode can periodically verify the data checksums for the local
blocks.
Some of the issues to consider :
- How should we check the blocks ( no more often than once every couple of
weeks ?)
- How do we keep track of when a block was last verfied ( there is a .meta file
associcated with each lock ).
- What action to take once a corruption is detected
- Scanning should be done as a very low priority with rest of the datanode disk
traffic in mind.
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