[metrics-bugs] #26699 [Metrics/Library]: Use temporary files for storing descriptor files fetched from remote CollecTor server

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#26699: Use temporary files for storing descriptor files fetched from remote
CollecTor server
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     Reporter:  karsten          |      Owner:  metrics-team
         Type:  enhancement      |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Library  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 In #24153 we fixed a bug related to storing descriptor files fetched from
 a remote CollecTor server. We also briefly discussed using
 `Files.createTempFile()` for storing files, but we decided against doing
 that. Let's reconsider doing it when we have more time on our hands.

 Copied from irl's comment on that other ticket: ''`Files.createTempFile`
 only creates the empty file and gives you a `Path`. The file is actually
 permanent (although the operating system may clean it up once the process
 exits) unless you open it with `DELETE_ON_CLOSE` on use `.deleteOnExit()`.
 ([[https://docs.oracle.com/javase/9/docs/api/java/nio/file/Files.html
 #createTempFile-java.nio.file.Path-java.lang.String-java.lang.String-
 java.nio.file.attribute.FileAttribute...-|ref]]) One benefit might be that
 using tmpfs for intermediate files reduces disk I/O and speeds things up.
 If we're memory constrained and it becomes an issue though, we should make
 sure that the default temporary directory is overridden to a location on
 disk.''

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26699>
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