I'm working on packaging 2.0.1 rc but encountered a problem: R doc fails to
build. Can somebody take a look at the issue ASAP?

** knitting documentation of write.parquet
** knitting documentation of write.text
** knitting documentation of year

processing file: sparkr-vignettes.Rmd

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  |.                                                                |   1%
   inline R code fragments

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label: unnamed-chunk-1 (with options)
List of 1
 $ message: logi FALSE

Loading required package: methods

Attaching package: 'SparkR'

The following objects are masked from 'package:stats':

    cov, filter, lag, na.omit, predict, sd, var, window

The following objects are masked from 'package:base':

    as.data.frame, colnames, colnames<-, drop, intersect, rank,
    rbind, sample, subset, summary, transform, union

  |..                                                               |   3%
  ordinary text without R code

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label: unnamed-chunk-2 (with options)
List of 1
 $ message: logi FALSE

Spark package found in SPARK_HOME:
Error: Could not find or load main class org.apache.spark.launcher.Main
Quitting from lines 30-31 (sparkr-vignettes.Rmd)
Error in sparkR.sparkContext(master, appName, sparkHome, sparkConfigMap,  :
  JVM is not ready after 10 seconds
Calls: render ... eval -> eval -> sparkR.session -> sparkR.sparkContext

Execution halted
jekyll 2.5.3 | Error:  R doc generation failed
Deleting credential directory
Build step 'Execute shell' marked build as failure
[WS-CLEANUP] Deleting project workspace...[WS-CLEANUP] done
Finished: FAILURE

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