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https://issues.apache.org/jira/browse/HBASE-2385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12850994#action_12850994
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Jean-Daniel Cryans commented on HBASE-2385:
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I agree the logging level should be changed.
The bug you hit is HBASE-2174.
> Debug Message "Received report from unknown server" should be INFO or WARN
> --------------------------------------------------------------------------
>
> Key: HBASE-2385
> URL: https://issues.apache.org/jira/browse/HBASE-2385
> Project: Hadoop HBase
> Issue Type: Improvement
> Components: master
> Affects Versions: 0.20.3
> Environment: Debian 6 / DNS with default mdns4
> Reporter: Al Lias
> Priority: Minor
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> We had debian 6 installed with a HA-DNS that failed-over.
> As a result, the DNS resolution was wrong for a short moment and the master
> received suddenly messages from "unknown" region servers:
> 2010-03-29 12:02:56,672 DEBUG org.apache.hadoop.hbase.master.ServerManager:
> Received report from unknown server -- telling it to MSG_CALL_SERVER_STARTUP:
> 172.17.0.102,60020,1269856690485
> This happened in production mode: I think, it relativly critical thing that
> happened, so a INFO or WARN logging level would have helped us much quicker
> to figure out the reason.
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