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    • François Tigeot's avatar
      elasticsearch: Stop using mmap(2) · 5d8ae7f3
      François Tigeot authored 
      * It caused every JVM process to eventually use 1.1TB+ of virtual memory
  on our setup, causing excessive VM fragmentation and performance
  degradation. Elasticsearch nodes eventually became unable to process
  data after a while.

* Switching from mmap(2) to the niofs API also measurably decreased
  I/O wait and disk trashing, increasing performance under load.
      5d8ae7f3
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