[SPARK-3000][CORE] drop old blocks to disk in parallel when free memory is not enough for caching new blocks#2134

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liyezhang556520 wants to merge 9 commits intoapache:masterfrom

liyezhang556520:spark-3000-v0.4.1

Commits on Apr 14, 2015

[SPARK-3000][CORE] drop old blocks to disk in parallel when memory is not large enough for caching new blocks
liyezhang556520
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add logInfo back when dropping a block from memory
liyezhang556520
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indentation correction and some comments modified
liyezhang556520
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handle exception when dropping blocks accroding comments in [SPARK-1888] PR#791
liyezhang556520
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refine code style
liyezhang556520
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make logic correctly when unrolling memory if encounter exceptions
liyezhang556520
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rebased and isolate each threads operation, the freed memory by droppig old blocks can only be used by current blocks, in this way to avoid OOM risk
liyezhang556520
committed

Commits on Apr 16, 2015