Update deprecated hash function

[esmioley]

Guava deprecated hashString(String) in v15, and removed it in v16.
Replace call with hashUnencodedString(String), which replace it, to
be compatible with newer versions of Guava.

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[ovj]

@vinothchandar , @n3nash FYI.

[vinothchandar]

Happy to pull this.. but fyi

<!-- we have to stay at <= 16.0, due to issues with HBase client -->
            <dependency>
                <groupId>com.google.guava</groupId>
                <artifactId>guava</artifactId>
                <version>15.0</version>
            </dependency>

[vinothchandar]

I am afraid we have a problem. Spark is still on 14.0 and a job fails as below.

java.lang.NoSuchMethodError: com.google.common.hash.HashFunction.hashUnencodedChars(Ljava/lang/CharSequence;)Lcom/google/common/hash/HashCode;
	at com.uber.hoodie.table.HoodieCopyOnWriteTable$UpsertPartitioner.getPartition(HoodieCopyOnWriteTable.java:363)
	at org.apache.spark.shuffle.sort.BypassMergeSortShuffleWriter.write(BypassMergeSortShuffleWriter.java:152)
	at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:96)
	at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:53)
	at org.apache.spark.scheduler.Task.run(Task.scala:99)
	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:282)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:748)

I am going to revert this change. Can you comment on how you got this tested? I am using Spark 2.1

[vinothchandar]

@esmioley ^^

[esmioley]

We're using a spark build running with guava 16 (which is why it was failing in the first place, requiring a change)

[vinothchandar]

when you say spark build, is this our own spark library build or final jar given to spark-submit has guava 16.