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From "Paurav Munshi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9743) TestStaticMapping test fails
Date Tue, 14 Feb 2017 06:10:41 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15865138#comment-15865138

Paurav Munshi commented on HADOOP-9743:


I saw the issue is resolved, but I was still facing the issue when doing my first Hadoop build
for 3.0.0-alpha1. And here is my observation.

I think the issue occurs depending on how your internet provider handles the address lookup.
When I am connected through my broadband provider I get the build failure. I observed that
createQueryList() adds two dummy hosts 'n1' and 'unknown'. Now when I traceroute to these
hosts while connected through broadband, I am returned with some random IP which is same for
both the hostnames. But when I am not connected to internet or I am connected through my mobile
data, traceroute gives the unknown host error. In this situation the build is also successfull
for this test case in particular. So it makes me think that some ISP might be providing a
random IP for unknown hosts and thereby forcing the client to think that host exists at that
IP address. In my observation, since both the hosts are dummy ones,  ISP provides same randon
IP and therefore test is landing up with single IP in the cache. I have not thought of any
concrete resolution but turning off network helps resolves this issue (though it fails TestDNS

Thought of sharing my observation. I hope this helps, if issue still exists.Pardon me for
missing the resolution if any is provided.

Best Regards,

> TestStaticMapping test fails
> ----------------------------
>                 Key: HADOOP-9743
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9743
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Jean-Baptiste Onofré
>   - testCachingRelaysResolveQueries(org.apache.hadoop.net.TestStaticMapping): Expected
two entries in the map Mapping: cached switch mapping relaying to static mapping with single
switch = false(..)
>   - testCachingCachesNegativeEntries(org.apache.hadoop.net.TestStaticMapping): Expected
two entries in the map Mapping: cached switch mapping relaying to static mapping with single
switch = false(..)

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