Github user calvinjia commented on the pull request:
https://github.com/apache/spark/pull/5354#issuecomment-92518143
Sorry for the bad example, here is (hopefully) a better explanation:
Previously:
`tachyon-client` depends on `tachyon`
`tachyon` depends on `hadoop-client`, `curator`, etc.
`tachyon` shades `thrift`
`thrift` depends on `httpclient`
Unfortunately in this scenario, importing `tachyon-client` would only give
visibility to `tachyon`'s transitive dependencies `hadoop-client`, `curator`,
etc. but not `httpclient` which caused a conflict.
Now:
`tachyon-client` depends on `tachyon`
`tachyon` depends on `hadoop-client`, `curator`, etc.
`tachyon` shades `thrift`
`tachyon` promotes dependencies, causing top level dependencies of
`httpclient`, `hadoop-core`, etc. which are now visible and can be excluded.
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