Github user HeartSaVioR commented on the pull request:
https://github.com/apache/storm/pull/1231#issuecomment-198409022
The difference is...
* https://travis-ci.org/apache/storm/jobs/116573241 (oraclejdk7,
`!storm-core`)
```
[INFO] Scanning for projects...
[INFO] Downloading:
https://repository.apache.org/snapshots/org/apache/storm/storm/2.0.0-SNAPSHOT/maven-metadata.xml
[INFO]
------------------------------------------------------------------------
[INFO] Reactor Build Order:
...
```
No error to download metadata of Storm 2.0.0 SNAPSHOT from
repository.apache.org.
*This is the strange point.*
* https://travis-ci.org/apache/storm/jobs/116573242 (oraclejdk8,
`!storm-core`)
```
[INFO] Scanning for projects...
[INFO] Downloading:
https://repository.apache.org/snapshots/org/apache/storm/storm/2.0.0-SNAPSHOT/maven-metadata.xml
[INFO] Downloading:
https://oss.sonatype.org/content/repositories/snapshots/org/apache/storm/storm/2.0.0-SNAPSHOT/maven-metadata.xml
[INFO] Downloading:
https://nexus.codehaus.org/snapshots/org/apache/storm/storm/2.0.0-SNAPSHOT/maven-metadata.xml
[WARNING] Could not transfer metadata
org.apache.storm:storm:2.0.0-SNAPSHOT/maven-metadata.xml from/to
codehaus-snapshots (https://nexus.codehaus.org/snapshots/): nexus.codehaus.org:
unknown error
[INFO] Downloading:
https://oss.sonatype.org/content/repositories/snapshots/org/apache/storm/storm/2.0.0-SNAPSHOT/storm-2.0.0-SNAPSHOT.pom
[INFO] Downloading:
https://repository.apache.org/snapshots/org/apache/storm/storm/2.0.0-SNAPSHOT/storm-2.0.0-SNAPSHOT.pom
[INFO] Downloading:
https://nexus.codehaus.org/snapshots/org/apache/storm/storm/2.0.0-SNAPSHOT/storm-2.0.0-SNAPSHOT.pom
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR] The project org.apache.storm:storm-mongodb:[unknown-version]
(/home/travis/build/apache/storm/external/storm-mongodb/pom.xml) has 1 error
[ERROR] Non-resolvable parent POM: Could not transfer artifact
org.apache.storm:storm:pom:2.0.0-SNAPSHOT from/to codehaus-snapshots
(https://nexus.codehaus.org/snapshots/): nexus.codehaus.org and
'parent.relativePath' points at wrong local POM @ line 21, column 13: Unknown
host nexus.codehaus.org -> [Help 2]
```
It can't find the metadata from repository.apache.org so go on finding
alternative repositories.
And stuck on nexus.codehaus.org, because all codehaus services have now
been terminated and maven too.
Please refer https://www.codehaus.org/
I don't have an idea why it searches nexus.codehaus.org, but anyway that's
the point why build failed.
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