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[SPARK-1194] Fix the same-RDD rule for cache replacement
SPARK-1194: https://spark-project.atlassian.net/browse/SPARK-1194 In the current implementation, when selecting candidate blocks to be swapped out, once we find a block from the same RDD that the block to be stored belongs to, cache eviction fails and aborts. In this PR, we keep selecting blocks *not* from the RDD that the block to be stored belongs to until either enough free space can be ensured (cache eviction succeeds) or all such blocks are checked (cache eviction fails). Author: Cheng Lian <firstname.lastname@example.org> Closes #96 from liancheng/fix-spark-1194 and squashes the following commits: 2524ab9 [Cheng Lian] Added regression test case for SPARK-1194 6e40c22 [Cheng Lian] Remove redundant comments 40cdcb2 [Cheng Lian] Bug fix, and addressed PR comments from @mridulm 62c92ac [Cheng Lian] Fixed SPARK-1194 https://spark-project.atlassian.net/browse/SPARK-1194
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