Todd Lipcon created HADOOP-9150:
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Summary: Unnecessary DNS resolution attempts for logical URIs
Key: HADOOP-9150
URL: https://issues.apache.org/jira/browse/HADOOP-9150
Project: Hadoop Common
Issue Type: Bug
Components: ha
Affects Versions: 2.0.2-alpha, 3.0.0
Reporter: Todd Lipcon
Priority: Critical
In the FileSystem code, we accidentally try to DNS-resolve the logical name
before it is converted to an actual domain name. In some DNS setups, this can
cause a big slowdown - eg in one misconfigured cluster we saw a 2-3x drop in
terasort throughput, since every task wasted a lot of time waiting for slow
"not found" responses from DNS.
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