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Posted to dev@hbase.apache.org by "Mark Robert Miller (Jira)" <ji...@apache.org> on 2020/05/11 20:18:00 UTC
[jira] [Resolved] (HBASE-23796) Consider using 127.0.0.1 instead of
localhost and binding to 127.0.0.1 as well.
[ https://issues.apache.org/jira/browse/HBASE-23796?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mark Robert Miller resolved HBASE-23796.
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Resolution: Won't Fix
This was helpful to me in getting more successful test runs outside of docker, but in recent days, branch-2 can actually pass for me a decent percentage of runs without this change or Docker, so I'm not sure how valuable any of this remaining is. Hadoop auto looks up the hostname regardless of this setting a lot and that appears very slow in my env when happening a lot concurrently and so trying to get out of docker to perform like in docker in my case doesn't seem easily attainable. In docker it is.
> Consider using 127.0.0.1 instead of localhost and binding to 127.0.0.1 as well.
> -------------------------------------------------------------------------------
>
> Key: HBASE-23796
> URL: https://issues.apache.org/jira/browse/HBASE-23796
> Project: HBase
> Issue Type: Test
> Reporter: Mark Robert Miller
> Priority: Minor
>
> This is perhaps controversial, but there are a variety of problems with counting on dns hostname resolution, especially for locahost.
>
> # It can often be slow, slow under concurrency, or slow under specific conditions.
> # It can often not work at all - when on a VPN, with weird DNS hijacking hi-jinks, when you have a real hostname for you machines, a custom /etc/hosts file, OS's run their own local/funny DNS server services.
> # This makes coming to HBase for new devs a hit or miss experience and if you miss, dealing with an diagnosing the issues is a large endeavor and not straight forward or transparent.
> # 99% of the difference doesn't matter in most cases - except that 127.0.0.1 works and is fast pretty much universally.
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