[SPARK-11424] Guard against double-close() of RecordReaders (branch-1.4 backport)#9388

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JoshRosen wants to merge 4 commits intoapache:branch-1.4from

JoshRosen:hadoop-decompressor-pooling-fix-branch-1.4

Commits on Oct 31, 2015

Commits on Nov 1, 2015

Update SqlNewHadoopRDD.scala
JoshRosen
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