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src/tests/fetcher_cache_tests.cpp <https://reviews.apache.org/r/30774/#comment129437> Not sure why you picked an arbitrary number 5 here, why not let it be passed in? src/tests/fetcher_cache_tests.cpp <https://reviews.apache.org/r/30774/#comment129438> Always one file expected in the cache - Timothy Chen On April 10, 2015, 11:33 a.m., Bernd Mathiske wrote: > > ----------------------------------------------------------- > This is an automatically generated e-mail. To reply, visit: > https://reviews.apache.org/r/30774/ > ----------------------------------------------------------- > > (Updated April 10, 2015, 11:33 a.m.) > > > Review request for mesos, Adam B, Benjamin Hindman, Till Toenshoff, and > Timothy Chen. > > > Bugs: MESOS-2057, MESOS-2069, MESOS-2070, MESOS-2072, MESOS-2073, and > MESOS-2074 > https://issues.apache.org/jira/browse/MESOS-2057 > https://issues.apache.org/jira/browse/MESOS-2069 > https://issues.apache.org/jira/browse/MESOS-2070 > https://issues.apache.org/jira/browse/MESOS-2072 > https://issues.apache.org/jira/browse/MESOS-2073 > https://issues.apache.org/jira/browse/MESOS-2074 > > > Repository: mesos > > > Description > ------- > > Almost all of the functionality in epic MESOS-336. Downloaded files from > CommandInfo::URIs can now be cached in a cache directory designated by a > slave flag. This only happens when asked for by an extra flag in the URI and > is thus backwards-compatible. The cache has a size limit also given by a new > slave flag. Cache-resident files are evicted as necessary to make space for > newly fetched ones. Concurrent attempts to cache the same URI leads to only > one download. The fetcher program remains external for safety reasons, but is > now augmented with more elaborate parameters packed into a JSON object to > implement specific fetch actions for all of the above. Additional testing > includes fetching from (mock) HDFS and coverage of the new features. > > > Diffs > ----- > > docs/configuration.md 54c4e31ed6dfed3c23d492c19a301ce119a0519b > docs/fetcher-cache-internals.md PRE-CREATION > docs/fetcher.md PRE-CREATION > include/mesos/fetcher/fetcher.proto > 311af9aebc6a85dadba9dbeffcf7036b70896bcc > include/mesos/mesos.proto 3a8e8bf303e0576c212951f6028af77e54d93537 > include/mesos/type_utils.hpp cdf5864389a72002b538c263d70bcade2bdffa45 > src/Makefile.am fa609da08e23d6595a3f6d2efddd3e333b6c78f1 > src/hdfs/hdfs.hpp 968545d9af896f3e72e156484cc58135405cef6b > src/launcher/fetcher.cpp 796526f59c25898ef6db2b828b0e2bb7b172ba25 > src/slave/constants.hpp fd1c1aba0aa62372ab399bee5709ce81b8e92cec > src/slave/containerizer/docker.hpp 6893684e6d199a5d69fc8bba8e60c4acaae9c3c9 > src/slave/containerizer/docker.cpp f9fb07806e3b7d7d2afc1be3b8756eac23b32dcd > src/slave/containerizer/fetcher.hpp > 1db0eaf002c8d0eaf4e0391858e61e0912b35829 > src/slave/containerizer/fetcher.cpp > 9e9e9d0eb6b0801d53dec3baea32a4cd4acdd5e2 > src/slave/containerizer/mesos/containerizer.hpp > ae61a0fcd19f2ba808624312401f020121baf5d4 > src/slave/containerizer/mesos/containerizer.cpp > e4136095fca55637864f495098189ab3ad8d8fe7 > src/slave/flags.hpp d3b1ce117fbb4e0b97852ef150b63f35cc991032 > src/slave/flags.cpp 35f56252cfda5011d21aa188f33cc3e68a694968 > src/slave/slave.cpp 9fec023b643d410f4d511fa6f80e9835bab95b7e > src/tests/docker_containerizer_tests.cpp > c772d4c836de18b0e87636cb42200356d24ec73d > src/tests/fetcher_cache_tests.cpp PRE-CREATION > src/tests/fetcher_tests.cpp 4549e6a631e2c17cec3766efaa556593eeac9a1e > src/tests/mesos.hpp 0e98572a62ae05437bd2bc800c370ad1a0c43751 > src/tests/mesos.cpp 02cbb4b8cf1206d0f32d160addc91d7e0f1ab28b > > Diff: https://reviews.apache.org/r/30774/diff/ > > > Testing > ------- > > make check > > --- longer Description: --- > > -Replaces all other reviews for the fetcher cache except those related to > stout: 30006, 30033, 30034, 30036, 30037, 30039, 30124, 30173, 30614, 30616, > 30618, 30621, 30626. See descriptions of those. In dependency order: > > 30033: Removes the fetcher env tests since these won't be needed any more > when the fetcher uses JSON in a single env var as a parameter. They never > tested anything that won't be covered by other tests anyway. > > 30034: Makes the code structure of all fetcher tests the same. Instead of > calling the run method of the fetcher directly, calling through fetch(). Also > removes all uses of I/O redirection, which is not really needed for > debugging, and thus the next patch can refactor fetch() and run(). (The > latter comes in two varieties, which complicates matters without much > benefit.) > > 30036: Extends the CommandInfo::URI protobuf with a boolean "caching" field > that will later cause fetcher cache actions. Also introduces the notion of a > cache directory to the fetcher info protobuf. And then propagates these > additions throughout the rest of the code base where applicable. This > includes passing the slave ID all the way down to the place where the cache > dir name is constructed. > > 30037: Extends the fetcher info protobuf with "actions" (fetch directly > bypassing the cache, fetch through the cache, retrieve from the cache). > Switches the basis for dealing with uris to "items", which contain the uri, > the action, and potentially a cache file name. Refactors fetch() and run(), > so there is only one of each. Introduces about half of the actual cache > logic, including a hashmap of cache file objects for bookkeeping and basic > operations on it. > > 30039: Enables fetcher cache actions in the mesos fetcher program. > > 30006: Enables concurrent downloading into the fetcher cache. Reuse of > download results in the cache when multiple fetcher runs occur concurrently. > > 30614: This is to ensure that all this refactoring of fetcher code has not > broken HDFS fetching. Adds a test that exercises the C++ code paths in Mesos > and mesos-fetcher related to fetching from HDFS. Uses a mock HDFS client > written in bash that acts just like a real "hadoop" command if used in the > right limited way. > > 30124: Inserted fetcher cache zap upon slave startup, recovery and shutdown. > This implements recovery in an acceptable, yet most simple way. > > 30173: Created fetcher cache tests. Adds a new test source file containing a > test fixture and tests to find out if the fetcher cache works with a variety > of settings. > > 30616: Adds hdfs::du() which calls "hadoop fs -du -h" and returns a string > that contains the file size for the URI passed as argument. This is needed to > determine the size of a file on HDFS before downloading it to the fetcher > cache (to ensure there is enough space). > > 30621: Refactored URI type separation in mesos-fetcher. Moved the URI type > separation code (distinguishes http, hdfs, local copying, etc.) from > mesos-fetcher to the fetcher process/actor, since it is going to be reused by > download size queries when we introduce fetcher cache management. Also > factored out URI validation, which will be used the same way by mesos-fetcher > and the fetcher process/actor. > > 30626: Fetcher cache eviction. This happens when the cache does not have > enough space to accomodate upcoming downloads to the cache. Necessary > provisions included here: > - mesos-fetcher does not run until evictions have been successful > - Cache space is reserved while (async) waiting for eviction to succeed. If > it fails, the reservation gets undone. > - Reservations can be partly from available space, partly from evictions. All > math included :-) > - To find out how much space is needed, downloading has a prelude in which we > query the download size from the URI. This works for all URI types that > mesos-fetcher currently supports, including http and hdfs. > - Size-determination requests are now synchronized, too. Only one per URI in > play happens. > - There is cleanup code for all kinds of error situations. At the very end of > the fetch attempt, each list is processed for undoing things like space > reservations and eviction disabling. > - Eviction gets disabled for URIs that are currently in use, i.e. the related > cache files are. We use reference counting for this, since there may be > concurrent fetch attempts using the same cache files. > > > Thanks, > > Bernd Mathiske > >