Performance degradation with Block CRCs
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Key: HADOOP-1649
URL: https://issues.apache.org/jira/browse/HADOOP-1649
Project: Hadoop
Issue Type: Bug
Affects Versions: 0.14.0
Reporter: Raghu Angadi
Assignee: Raghu Angadi
Priority: Blocker
Fix For: 0.14.0
Performance is noticeably affected by Block Level CRCs patch (HADOOP-1134).
This is more noticeable on writes (randomriter test etc).
With random writer, it takes 20-25% on small cluster (20 nodes) and many be 10%
on larger cluster.
There are a few differences in how data is written with 1134. As soon as I can
reproduce this, I think it will easier to fix.
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