commit | 1962946d2cf6804fa92c15914daa8d48a14f5e09 | [log] [tgz] |
---|---|---|
author | mynameborat <bharath.kumarasubramanian@gmail.com> | Tue Dec 08 11:08:08 2020 -0800 |
committer | GitHub <noreply@github.com> | Tue Dec 08 11:08:08 2020 -0800 |
tree | 76c77eb28ed836ef8759f99a5c674ced9278995d | |
parent | 5a099ebae130079e71c9b26797b41fe6e9252898 [diff] |
SAMZA-2609: Data model changes to track lifecycle information of job coordinator (#1449) Description: With AM HA, the new AM will regenerate job model, do job planning and rewrite configurations and may have to spin up containers. The new rewritten configurations, job model can change from the existing metadata on which the containers are running. In order to handle this change of metadata, we need a way to identify lifecycle of the AM and store some information on the previous snapshot of the metadata. Changes: Epoch identifier of the AM attempt so that we can determine if the new attempt is part of the same lifecycle of AM or a new deployment lifecycle Metadata on the job model, configuration so, that we can use this information to decide the course of action if current metadata changed in comparison with the previous snapshot. Metrics capturing the changes in metadata Coordinator stream message updates for new metadata The code path as is not exercised actively and will be leveraged by the PRs to follow. API Changes: Added new Coordinator stream message type Introduced data model for job coordinator metadata internal to samza
Apache Samza is a distributed stream processing framework. It uses Apache Kafka for messaging, and Apache Hadoop YARN to provide fault tolerance, processor isolation, security, and resource management.
Samza's key features include:
Check out Hello Samza to try Samza. Read the Background page to learn more about Samza.
To build Samza from a git checkout, run:
./gradlew clean build
To build Samza from a source release, it is first necessary to download the gradle wrapper script above. This bootstrapping process requires Gradle to be installed on the source machine. Gradle is available through most package managers or directly from its website. To bootstrap the wrapper, run:
gradle -b bootstrap.gradle
After the bootstrap script has completed, the regular gradlew instructions below are available.
Samza builds with Scala 2.11 or 2.12 and YARN 2.6.1, by default. Use the -PscalaSuffix switches to change Scala versions. Samza supports building Scala with 2.11 and 2.12.
./gradlew -PscalaSuffix=2.11 clean build
To run all tests:
./gradlew clean test
To run a single test:
./gradlew clean :samza-test:test -Dtest.single=TestStatefulTask
To run key-value performance tests:
./gradlew samza-shell:kvPerformanceTest -PconfigPath=file://$PWD/samza-test/src/main/config/perf/kv-perf.properties
To run yarn integration tests:
./bin/integration-tests.sh <dir> yarn-integration-tests
To run standalone integration tests:
./bin/integration-tests.sh <dir> standalone-integration-tests
./gradlew checkstyleMain checkstyleTest
To run a job (defined in a properties file):
./gradlew samza-shell:runJob -PconfigPath=/path/to/job/config.properties
To inspect a job's latest checkpoint:
./gradlew samza-shell:checkpointTool -PconfigPath=/path/to/job/config.properties
To modify a job's checkpoint (assumes that the job is not currently running), give it a file with the new offset for each partition, in the format systems.<system>.streams.<topic>.partitions.<partition>=<offset>
:
./gradlew samza-shell:checkpointTool -PconfigPath=/path/to/job/config.properties \ -PnewOffsets=file:///path/to/new/offsets.properties
To get Eclipse projects, run:
./gradlew eclipse
For IntelliJ, run:
./gradlew idea
To start contributing on Samza please read Rules and Contributor Corner. Notice that Samza git repository does not support git pull request.
Apache Samza is a top level project of the Apache Software Foundation.