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From "Gilbert Song" <>
Subject Re: Review Request 39331: Support docker local store pull image simultaneously
Date Mon, 09 Nov 2015 19:26:03 GMT

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(Updated Nov. 9, 2015, 11:26 a.m.)

Review request for mesos, Anand Mazumdar, Jie Yu, Jojy Varghese, and Timothy Chen.

Bugs: MESOS-3736

Repository: mesos


Support docker local store pull image simultaneously

Diffs (updated)

  src/slave/containerizer/mesos/provisioner/docker/store.hpp 95e46b9914c018b3e2472f98a54bc33ff9a46e17

  src/slave/containerizer/mesos/provisioner/docker/store.cpp bb02d650e16d45fcf337a7954f7a26143fb2c69f

  src/tests/containerizer/provisioner_docker_tests.cpp fe6a90fe32364eec8ef923a000db19183603c338



make check (ubuntu14.04 + clang-3.6)

*This is not ready to be merged.
*Still considering two question:
 1. Handling simultaneous failure. If the first request is called and is written into the
hashmap. All the other requests will be waiting for the future of the first request. But because
its return type is 'Future<vector<string>>', if its future status is 'FAILED/DISCARDED',
the other requests will be waiting forever. 
    Solved by logic check: if it is the first call to get() Image_A, promise associate with
metadateManager->get(). If not, check whether that promised future failed/discarded. If
yes, over write to the hashmap.
 2. The current hashmap uses 'stringify(image::name)' as key, but it may not be unique because
there is chance that layer_ids can be changed. 
    One solution is to have 'stringify(image)' as key.


Gilbert Song

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