commit | 108768393960a893f9d202edf50bf47d2b1af590 | [log] [tgz] |
---|---|---|
author | mynameborat <bharath.kumarasubramanian@gmail.com> | Wed Dec 09 09:33:11 2020 -0800 |
committer | GitHub <noreply@github.com> | Wed Dec 09 09:33:11 2020 -0800 |
tree | 80547ecb01f4b4465c259d18ff276a34495987aa | |
parent | 1962946d2cf6804fa92c15914daa8d48a14f5e09 [diff] |
SAMZA-2610: Handle Metadata changes for AM HA orchestration (#1450) Description: AM performs planning and job model generation for every incarnation. With AM-HA, the new job model or configuration may invalidate the containers from the previous attempt. In order to ensure correctness, we handle this by detecting these changes and restart all the containers in case of any changes to metadata (job model or configuration). Changes: Detect changes in metadata by reading older metadata from coordinator stream and signal the CPM As part of resource request & orchestration, ignore the containers that are already running from the previous attempt and proceed to release them if metadata changed. Releasing the container will signal RM through AMRM client and RM will orchestrate killing the processing container. It is different from the normal StopStreamProcessor flow as the NMClient isn't the source of truth and doesn't have context about the containers spun in the previous attempts
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.