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[ML] Take more care that memory estimation uses unique named pipes #60406

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droberts195
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Prior to this change ML memory estimation processes for a
given job would always use the same named pipe names. This
would often cause one of the processes to fail.

This change avoids this risk by adding an incrementing counter
value into the named pipe names used for memory estimation
processes.

Backport of #60395

Prior to this change ML memory estimation processes for a
given job would always use the same named pipe names.  This
would often cause one of the processes to fail.

This change avoids this risk by adding an incrementing counter
value into the named pipe names used for memory estimation
processes.

Backport of elastic#60395
@droberts195 droberts195 merged commit 6b413f3 into elastic:7.9 Jul 29, 2020
@droberts195 droberts195 deleted the ensure_estimation_named_pipes_unique_79 branch July 29, 2020 16:30
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