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From Joseph Wu <>
Subject Re: Review Request 58900: Changed the default fetcher cache directory.
Date Wed, 10 May 2017 20:32:24 GMT

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(Updated May 10, 2017, 1:32 p.m.)

Review request for mesos and Jie Yu.


Need to change the local cluster helper to create a different fetcher cache directory per

Bugs: MESOS-7304

Repository: mesos


The fetcher cache directory was historically located (by default)
in `/tmp/mesos/fetch`.  The agent flag `--fetcher_cache_dir` could
be used to change this value.

The fetcher would create a subdirectory underneath `/tmp/mesos/fetch`
for each `SlaveID`.  This was done because multiple agents can run on
the same node.  If all the agents use the same default fetcher cache
directory, they will collide and cause unpredictable results.
As a result, the `SlaveID` needed to be passed into the fetcher
after the agent recovers and/or registers with the master, because
that is when the `SlaveID` is determined.

This changes the default fetcher cache directory to
`/tmp/mesos/fetch`.  The `SlaveID` subdirectory has been removed.

This change, while techically a breaking change, is safe because of
how the fetcher uses this directory.  Upon starting up, the fetcher
"recovers" by clearing this directory.  Although the subdirectory
has been removed, the fetcher still clears the fetcher cache
on startup.

This change will only cause breakages if multiple agents are run
with the same `--fetcher_cache_dir`.  In this case, each agent
will delete the fetcher caches of all the other agents.


With the removal of the `SlaveID` field in the fetcher's methods,
it is no longer necessary to pass in the `SlaveID` or agent Flags
at agent recovery time.  Instead, the flags can be passed in during
the fetcher's construction.

Similarly, the fetcher's "recovery" (clearing the fetcher cache)
can be done immediately upon construction, which simplifies the
code slightly.

Diffs (updated)

  src/local/local.cpp e47980929db2da1f31cf899a0e1fc452070e11f3 
  src/slave/containerizer/fetcher.hpp 9e3018dc087ed55c61b2824d0105bc5339b83043 
  src/slave/containerizer/fetcher.cpp a910fea5a5556afb376524c5bb2ff98d7d84e611 
  src/slave/flags.cpp bc63a6a4cb6115b4b4d592e67e34045f52b50d4c 
  src/slave/main.cpp 507d59996a90f51c7cd1e0f836a34c2e9c484791 
  src/slave/slave.cpp 209aff180db1a68ae360d7c278937fe645efdb2b 




See last patch in chain.


Joseph Wu

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