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(Updated May 31, 2017, 6 p.m.) Review request for mesos, Gilbert Song, Jason Lai, and Jie Yu. Changes ------- Rebase and merge layers metrics. Bugs: MESOS-6893 https://issues.apache.org/jira/browse/MESOS-6893 Repository: mesos Description (updated) ------- This patch added the following capabilities: 1. add the size and fetch timestamp of each docker image layer in metadata; 2. checkpoint and recover size (timestamp will be added later); 3. reuse the `DiskUsageCollector` class to track size of each downloaded store; 4. for upgrade path, reuse same collector to back fill the size of layers. 5. a counter for number of layers pulled 6. a gauge for total number of layers 7. a timer for pull latency distribution in the last hour Tests to be added later. Sending out review for earlier feedback. Diffs (updated) ----- src/slave/containerizer/mesos/provisioner/docker/message.proto a55ac9010d5e5b5691ec34b6c342e57811aee4ce src/slave/containerizer/mesos/provisioner/docker/metadata_manager.hpp 954da1681778878c8aff6150002e52ecb648d1bb src/slave/containerizer/mesos/provisioner/docker/metadata_manager.cpp d86afd2a6ff0bf87e624db1c99255c85068bf6ab src/slave/containerizer/mesos/provisioner/docker/store.cpp 8058dcb31b9de59fa8d3638b5511113632235542 Diff: https://reviews.apache.org/r/55727/diff/3/ Changes: https://reviews.apache.org/r/55727/diff/2-3/ Testing ------- Thanks, Zhitao Li