viirya opened a new pull request #1356:
URL: https://github.com/apache/hive/pull/1356
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### What changes were proposed in this pull request?
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This PR proposes to shade Guava from hive-exec in Hive 2.3 branch.
### Why are the changes needed?
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When trying to upgrade Guava in Spark, found the following error. A Guava
method became package-private since Guava version 20. So there is
incompatibility with Guava versions > 19.0.
```
sbt.ForkMain$ForkError: sbt.ForkMain$ForkError:
java.lang.IllegalAccessError: tried to access method
com.google.common.collect.Iterators.emptyIterator()Lcom/google/common/collect/UnmodifiableIterator;
from class org.apache.hadoop.hive.ql.exec.FetchOperator
at
org.apache.hadoop.hive.ql.exec.FetchOperator.<init>(FetchOperator.java:108)
at
org.apache.hadoop.hive.ql.exec.FetchTask.initialize(FetchTask.java:87)
at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:541)
at org.apache.hadoop.hive.ql.Driver.compileInternal(Driver.java:1317)
at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1457)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1237)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1227)
```
This is a problem for downstream clients. Hive project noticed that problem
too in [HIVE-22126](https://issues.apache.org/jira/browse/HIVE-22126), however
that only targets 4.0.0. It'd be nicer if we can also shade Guava from current
Hive versions, e.g. Hive 2.3 line.
### Does this PR introduce _any_ user-facing change?
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Yes. Guava will be shaded from hive-exec.
### How was this patch tested?
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Built Hive locally and checked jar content.
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