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Date: Mon, 17 Dec 2012 18:56:22 +0000 (UTC)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <JIRA.12624326.1355770458109.17903.1355770582794@arcas>
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Subject: [jira] [Created] (HADOOP-9150) Unnecessary DNS resolution attempts
 for logical URIs
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Todd Lipcon created HADOOP-9150:
-----------------------------------

             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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