> On April 29, 2015, 7:30 p.m., Yan Fang wrote: > > samza-core/src/main/java/org/apache/samza/coordinator/stream/CoordinatorStreamSystemConsumer.java, > > line 149 > > <https://reviews.apache.org/r/32147/diff/7/?file=922534#file922534line149> > > > > Will this bootstrappedStreamSet overflow or take a lot of memory ? > > Because we are putting all the messages in the stream to this map. When we > > consider the checkpoint msg, it can be huge. > > Naveen Somasundaram wrote: > It is true that we'll have multiple checkpoint messages, the reason why > it won't be big: > 1. The Coordinator stream will be log compacted. > 2. The HashSet reads from the oldest to the latest, and if there are > duplicates, it will overwritten in the HashSet. i.e., the Set should only > have the latest checkpoint (one per Task), all the previous checkpoints will > be overwritten as you are reading newer ones.
"2. The HashSet reads from the oldest to the latest, and if there are duplicates, it will overwritten in the HashSet. i.e., the Set should only have the latest checkpoint (one per Task), all the previous checkpoints will be overwritten as you are reading newer ones." Why is this? From the code, ``` CoordinatorStreamMessage coordinatorStreamMessage = new CoordinatorStreamMessage(keyArray, valueMap); bootstrappedStreamSet.add(coordinatorStreamMessage); ``` It keeps adding new coordinatorStreamMessage > On April 29, 2015, 7:30 p.m., Yan Fang wrote: > > samza-core/src/main/java/org/apache/samza/checkpoint/CheckpointManager.java, > > line 98 > > <https://reviews.apache.org/r/32147/diff/7/?file=922532#file922532line98> > > > > why do we need to bootstrap everytime we call this method? > > Naveen Somasundaram wrote: > We need to bootstrap everytime because, if the container fails and comes > back up, then we need to fetch the latest checkpoint from the coordinator > stream before we serve. This logic happens in JobCoordinator, for every HTTP > request, we refresh the JobModel, which ensures we always have the latest > JobModel (which has the latest checkpoint, because we bootstrap everytime). this makes sense. Thanks. > On April 29, 2015, 7:30 p.m., Yan Fang wrote: > > samza-core/src/main/scala/org/apache/samza/job/JobRunner.scala, lines 83-92 > > <https://reviews.apache.org/r/32147/diff/7/?file=922552#file922552line83> > > > > Will the old config be overwritten when we produce the new config? > > Naveen Somasundaram wrote: > Correct, this is code that deletes the delta (difference between the old > and new config): > ``` > (oldConfig.keySet -- config.keySet).foreach(key => { > coordinatorSystemProducer.send(new > CoordinatorStreamMessage.Delete(JobRunner.SOURCE, key, SetConfig.TYPE)) > }) > ``` Here I mean, will the old config be overriden by the new config? For example we have config foo=value1 in the stream. The new producer reads config file, which has foo=value2, and then "writeConfig" to the coordinator stream. Will the foo=value1 be replaced by foo=value2, then val oldConfig = coordinatorSystemConsumer.getConfig(); will get "foo=value1" instead? - Yan ----------------------------------------------------------- This is an automatically generated e-mail. To reply, visit: https://reviews.apache.org/r/32147/#review81995 ----------------------------------------------------------- On April 10, 2015, 3:13 a.m., Naveen Somasundaram wrote: > > ----------------------------------------------------------- > This is an automatically generated e-mail. To reply, visit: > https://reviews.apache.org/r/32147/ > ----------------------------------------------------------- > > (Updated April 10, 2015, 3:13 a.m.) > > > Review request for samza. > > > Repository: samza > > > Description > ------- > > SAMZA 465 > > > Diffs > ----- > > build.gradle 97de3a28f6379e3862eec845da87587b1d4f742e > samza-api/src/main/java/org/apache/samza/checkpoint/Checkpoint.java > samza-api/src/main/java/org/apache/samza/checkpoint/CheckpointManager.java > 092cb910b40d312217e86420bf1ddfbaf605e9e5 > > samza-api/src/main/java/org/apache/samza/checkpoint/CheckpointManagerFactory.java > a97ff0919d8205928efee1a2a20780659180849d > samza-api/src/main/java/org/apache/samza/container/TaskName.java > 083358686fc69ab45bbc73e898f419224ebc3a9f > samza-api/src/main/java/org/apache/samza/system/SystemAdmin.java > 8995ba30c823bddcdfd3af7100e1440e71ef7998 > samza-api/src/main/java/org/apache/samza/task/TaskCoordinator.java > 6ff1a555f3c48e416bb78e94c5df71eff0a27f3d > > samza-api/src/main/java/org/apache/samza/util/SinglePartitionWithoutOffsetsSystemAdmin.java > 01997ae22641b735cd452a0e89a49219e2874892 > samza-core/src/main/java/org/apache/samza/checkpoint/CheckpointManager.java > PRE-CREATION > > samza-core/src/main/java/org/apache/samza/coordinator/stream/CoordinatorStreamMessage.java > PRE-CREATION > > samza-core/src/main/java/org/apache/samza/coordinator/stream/CoordinatorStreamSystemConsumer.java > PRE-CREATION > > samza-core/src/main/java/org/apache/samza/coordinator/stream/CoordinatorStreamSystemProducer.java > PRE-CREATION > samza-core/src/main/java/org/apache/samza/job/model/TaskModel.java > eb22d2ec5f09ca59790e2871d9bff9745fe925dc > > samza-core/src/main/java/org/apache/samza/serializers/model/JsonTaskModelMixIn.java > 7dc431c74a3fc2ba80eb47d6c5d87524cb4c9bde > > samza-core/src/main/java/org/apache/samza/serializers/model/SamzaObjectMapper.java > 3517912eaafbf95f8c8cc70ab5869548a56b76e7 > > samza-core/src/main/java/org/apache/samza/storage/ChangelogPartitionManager.java > PRE-CREATION > samza-core/src/main/scala/org/apache/samza/checkpoint/CheckpointTool.scala > ddc30af7c52d8a4d5c5de02f6757c040b1f31c93 > samza-core/src/main/scala/org/apache/samza/checkpoint/OffsetManager.scala > a40c87fa7865746a5612c55a4cf24c8d005be7e0 > > samza-core/src/main/scala/org/apache/samza/checkpoint/file/FileSystemCheckpointManager.scala > 2a87a6e0cef72179b5383fc824266de1f9606293 > samza-core/src/main/scala/org/apache/samza/config/JobConfig.scala > 3b6685e00837a4aaf809813e62b7e52823bc07a9 > samza-core/src/main/scala/org/apache/samza/config/ShellCommandConfig.scala > 1a2dd4413f56e53dbeeb47b5637d7b0c50522f02 > samza-core/src/main/scala/org/apache/samza/config/StreamConfig.scala > adef09e15c666cb2dbb2e4c5507fc2d605b82a1e > samza-core/src/main/scala/org/apache/samza/config/TaskConfig.scala > 1ca9e2cc5673c537b6a48224809847e94da81fca > samza-core/src/main/scala/org/apache/samza/container/SamzaContainer.scala > 5416dd620b2f65ffb09cf5f8c07b1a547df82bab > samza-core/src/main/scala/org/apache/samza/coordinator/JobCoordinator.scala > c14f2f623bb4bae911dd3085ce428175930e4545 > > samza-core/src/main/scala/org/apache/samza/coordinator/server/HttpServer.scala > 10986a49b39cda703a0e54688dc914f2465c79c9 > > samza-core/src/main/scala/org/apache/samza/coordinator/server/JobServlet.scala > 635c3531a897a369c813821f7b901186e1281ed1 > > samza-core/src/main/scala/org/apache/samza/coordinator/stream/CoordinatorStreamSystemFactory.scala > PRE-CREATION > samza-core/src/main/scala/org/apache/samza/job/JobRunner.scala > 0b720ec4dd83c71fd1ce5071571c7a10babf0ddc > > samza-core/src/main/scala/org/apache/samza/job/local/ProcessJobFactory.scala > b80d34953a54ada461ed1d4b0dcfa07f4435f877 > samza-core/src/main/scala/org/apache/samza/job/local/ThreadJobFactory.scala > 530255e5866bc49ec5ce1a0b7437470cd4e17010 > samza-core/src/main/scala/org/apache/samza/serializers/JsonSerde.scala > 744eec05857a4ea14c718e3750fb575d3678b1f8 > > samza-core/src/main/scala/org/apache/samza/system/filereader/FileReaderSystemAdmin.scala > ec1d749cb5186f788b402877996a4caa37e99362 > samza-core/src/main/scala/org/apache/samza/util/Util.scala > 1a67586eeec95dabfeb3b6881af9b3865c3029ca > > samza-core/src/test/java/org/apache/samza/coordinator/stream/MockCoordinatorStreamSystemFactory.java > PRE-CREATION > > samza-core/src/test/java/org/apache/samza/coordinator/stream/MockCoordinatorStreamWrappedConsumer.java > PRE-CREATION > > samza-core/src/test/java/org/apache/samza/coordinator/stream/TestCoordinatorStreamMessage.java > PRE-CREATION > > samza-core/src/test/java/org/apache/samza/coordinator/stream/TestCoordinatorStreamSystemConsumer.java > PRE-CREATION > > samza-core/src/test/java/org/apache/samza/coordinator/stream/TestCoordinatorStreamSystemProducer.java > PRE-CREATION > > samza-core/src/test/java/org/apache/samza/serializers/model/TestSamzaObjectMapper.java > 76bc6810a3162a1dc58a36033b3b1f75616bd6ca > samza-core/src/test/resources/test.properties > 9348c7de956ebf02f58a163dc6fb391a7e29ae64 > > samza-core/src/test/scala/org/apache/samza/checkpoint/TestCheckpointTool.scala > af800dfeedbfea75abaac3f15fd53bc55b743daf > > samza-core/src/test/scala/org/apache/samza/checkpoint/TestOffsetManager.scala > d18d4c45c5de3b50a24d6c776364e1f589db8f4d > > samza-core/src/test/scala/org/apache/samza/checkpoint/file/TestFileSystemCheckpointManager.scala > 10ff1f437220b38810f8a32903cc72df20f206d3 > > samza-core/src/test/scala/org/apache/samza/container/TestSamzaContainer.scala > cab31ca6452e45c73808f20b12d39a30c117119a > > samza-core/src/test/scala/org/apache/samza/container/grouper/task/TestGroupByContainerCount.scala > 1ee5c06fbd1be5e4ce944a16454c8bd32459d395 > > samza-core/src/test/scala/org/apache/samza/coordinator/TestJobCoordinator.scala > a8e5d36921464a2e36693279e8083e4544c4e289 > > samza-core/src/test/scala/org/apache/samza/coordinator/server/TestHttpServer.scala > 9a8e1450a6cc14713817f719cfa56a0e5c97a6f6 > samza-core/src/test/scala/org/apache/samza/serializers/TestJsonSerde.scala > 60460713a2d4f7b7b389f21c1450d45c1afaa0f4 > > samza-kafka/src/main/scala/org/apache/samza/checkpoint/kafka/KafkaCheckpointLogKey.scala > 5d8ee4fa74be9ba36956c11ae33573be2d2d5826 > > samza-kafka/src/main/scala/org/apache/samza/checkpoint/kafka/KafkaCheckpointManager.scala > c9504ecf1d1edbc116ca6d794678062fddeee7fa > > samza-kafka/src/main/scala/org/apache/samza/checkpoint/kafka/KafkaCheckpointManagerFactory.scala > 3dfa26a23c88f9b5b8ffbfd64b59c4061a8ed2e7 > samza-kafka/src/main/scala/org/apache/samza/config/KafkaConfig.scala > 02a6ea94daf9eb597c9ecef5d63062df5861efc8 > > samza-kafka/src/main/scala/org/apache/samza/config/RegExTopicGenerator.scala > a34c3f2738855dbf3737639c33846fcad23bd3b9 > > samza-kafka/src/main/scala/org/apache/samza/system/kafka/KafkaSystemAdmin.scala > f783c5790f442928ea83b13359ac6b2a5bcb02e5 > > samza-kafka/src/main/scala/org/apache/samza/system/kafka/KafkaSystemFactory.scala > c84ceb75b84eb6d2ce115396ba54cf9e455d905c > > samza-kafka/src/test/scala/org/apache/samza/checkpoint/kafka/TestKafkaCheckpointLogKey.scala > b76d5ad68640908bef552125d405b467386025f8 > > samza-kafka/src/test/scala/org/apache/samza/checkpoint/kafka/TestKafkaCheckpointManager.scala > 7d4bea8398794c2325f9c022074303a83cfb164a > > samza-kafka/src/test/scala/org/apache/samza/system/kafka/TestKafkaSystemAdmin.scala > 0380d35121f4feb99efc7d092b4232030d12db01 > > samza-log4j/src/main/java/org/apache/samza/logging/log4j/StreamAppender.java > d3f25c0e03a727e64a774581384ef5aae9ef9c1c > samza-test/src/main/config/join/common.properties > ad10aac090beb072ecce3546f06279a7a6113970 > samza-test/src/main/config/negate-number.properties > b9f898c745250252461c833adb05e24ece2d4a89 > samza-test/src/main/config/perf/container-performance.properties > 86b2d58e2d4a9d6bcc9bd305bb7d735f7d1dd053 > samza-test/src/main/config/perf/kafka-read-write-performance.properties > 122b14aaecc2d221ac8944d04d508e7f83ede5ab > samza-test/src/main/java/org/apache/samza/system/mock/MockSystemAdmin.java > c0a20af5a2f4329ad4a2cff378ced3bececbc1cb > samza-test/src/main/python/samza_failure_testing.py > 198db26528cab8b473f794a922848a60299dc825 > > samza-test/src/main/scala/org/apache/samza/test/performance/TestPerformanceTask.scala > 45c76e86361b9e1a54cb5fc717126d36b64cf7e8 > > samza-test/src/test/scala/org/apache/samza/test/integration/TestStatefulTask.scala > d66b3bd070a4cef4b1d3dded1d79a33cbe3fa09b > samza-yarn/src/main/scala/org/apache/samza/config/YarnConfig.scala > 03395e2efa0fec723e354177d06bfacf7d2a9215 > samza-yarn/src/main/scala/org/apache/samza/job/yarn/SamzaAppMaster.scala > a1dbe0435ae08c710d4bfc871458ed386e275cd2 > > samza-yarn/src/main/scala/org/apache/samza/job/yarn/SamzaAppMasterState.scala > 8ba435ef2ccf2af64d01eb4bc3b1c362fb03779d > > samza-yarn/src/main/scala/org/apache/samza/job/yarn/SamzaAppMasterTaskManager.scala > b0b6543856cb87888c5a719182ad9576b51bba1a > samza-yarn/src/main/scala/org/apache/samza/job/yarn/YarnJob.scala > 24b11da06a69da734c85720ef39d65ee46d821d5 > > samza-yarn/src/test/scala/org/apache/samza/job/yarn/TestSamzaAppMasterLifecycle.scala > 765f72f4c10bd0f1d1adab28c8ec54d9cbea5fb4 > > samza-yarn/src/test/scala/org/apache/samza/job/yarn/TestSamzaAppMasterService.scala > 81dea9d6d1921462b200c62dbdf016c0eb2f01b2 > > samza-yarn/src/test/scala/org/apache/samza/job/yarn/TestSamzaAppMasterTaskManager.scala > 58f2464211a1fb7ff40f5978fd41f64d088002d0 > > Diff: https://reviews.apache.org/r/32147/diff/ > > > Testing > ------- > > The patch does the following: > 1. Removes all checkpointmanagers specific to the system and replaces them to > a single entity that uses coordinator stream to do the checkpointing > 2. Decoupled change log from checkpoint manager, a new component called > changelog manager will do that. > 3. Passes the checkpoint information to the containers from the jobcoordinator > 4. Modifies the offsetmanger to use the new checkpoint manager and starting > offsets from jobcoordinator. > > > Tests: > All existing Unit tests and Zopkio tests pass, I have changed some of > existing Unit tests as well. > Plan to add one more Unit test to verify checkpoint persistence (Stub present > in TestJobCoordinator) > > Pending Issues: > 1. The metrics registry is right now not used correctly, I need to pass the > right reference to it > 2. The coordinator stream does not use the same consumer and producer from > the "systemconsumers" and "systemproducers" we have (This will be done after > SAMZA-567) > 3. Remove checkpoint configs related to the stream, migrate them to the > coordinator stream and document them. > > > Thanks, > > Naveen Somasundaram > >
