commit | f7f9f3c7905b047f262383bcc64ebb01ab73f421 | [log] [tgz] |
---|---|---|
author | mynameborat <bharath.kumarasubramanian@gmail.com> | Wed Aug 26 19:39:32 2020 -0700 |
committer | GitHub <noreply@github.com> | Wed Aug 26 19:39:32 2020 -0700 |
tree | cc67aee4c3d5826097abe2da07ff153a7396f357 | |
parent | 29f2ef7cd9169ce8e0b474228c59a3a1da71e5c2 [diff] |
SAMZA-2439: Remove LocalityManager and container location information from JobModel (#1421) Issues Currently locality information is part of job model. Job model typically is immutable and fixed within the lifecycle of an application attempt. The locality information on the other hand is dynamic and changes in the event of container movements. Due to this difference, it makes it complicated to program, model or define semantics around these models when building features. Furthermore, by removing this dependency - Enables us to move JobModel to public APIs and expose it in JobContext - Enables us to cache and serve serialized JobModel from the AM servlet to reduce AM overhead (memory, open connections, num threads) during container startup, esp. for jobs with a large number of containers (See: #1241) - Removes tech debt: models should be immutable, and should not update themselves. - Removes tech debt: makes current container location a first class concept for container scheduling / placement , and for tools like dashboard, samza-rest, auto-scaling, diagnostics etc. Changes - Separated out locality information out of job model into LocalityModel - Introduced an endpoint in AM to serve locality information - Added Json MixIns for locality models (LocalityModel & ContainerLocality) - Moved JobModel to samza-api and exposed through JobContext API Changes: - Introduced new models for locality. - Previous job model endpoint will no longer serve locality information. i.e. tools using these will need to update to use the new endpoint. - Expose JobModel via JobContext
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.