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senlin.zslPhilipp Moritz
e237918f3ee
senlin.zsl authored and Philipp Moritz committed df2068381c1
ARROW-2595: [Plasma] Use map.find instead of operator[] to avoid producing garbage data

- Problem
  * Using object_get_requests_[object_id] will produce a lot of garbage data in PlasmaStore::return_from_get. During the measurement process, we found that there was a lot of memory growth in this point.

- Solution
  * Use iterator instead of operator []

Author: senlin.zsl <senlin.zsl@antfin.com>

Closes #2056 from wumuzi520/dev_slz and squashes the following commits:

ccaab502 <senlin.zsl> Use map.find instead of operator to avoid producing garbage data