|author||mynameborat <email@example.com>||Fri Mar 12 07:07:27 2021 -0800|
|committer||GitHub <firstname.lastname@example.org>||Fri Mar 12 07:07:27 2021 -0800|
SAMZA-2632: Processors should only write their own task locality to zookeeper (#1473) Problem: Processors update the task locality for all the tasks in the job model with their own locality regardless of whether the tasks belong to their container model or not. Description: As part of SEP 11, host affinity for standalone was introduced. For this feature, we persist the task locality in zookeeper so that subsequent rebalances take this locality into account when generating job model. During job model consensus, we update the task locality for all the tasks and this results in incorrect locality depending on the order of writes. Changes: Only update the locality for the tasks that belong to the processor.
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:
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.
./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
./gradlew samza-shell:checkpointTool -PconfigPath=/path/to/job/config.properties \ -PnewOffsets=file:///path/to/new/offsets.properties
To get Eclipse projects, run:
For IntelliJ, run:
Apache Samza is a top level project of the Apache Software Foundation.