Zhilong Hong created FLINK-20612:
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Summary: Add benchmarks for scheduler
Key: FLINK-20612
URL:
https://issues.apache.org/jira/browse/FLINK-20612 Project: Flink
Issue Type: Improvement
Components: Runtime / Coordination
Affects Versions: 1.13.0
Reporter: Zhilong Hong
With Flink 1.12, we failed to run large-scale jobs on our cluster. When we were trying to run the jobs, we met the exceptions like out of heap memory, taskmanager heartbeat timeout, and etc. We increased the size of heap memory and extended the heartbeat timeout, the job still failed. After the troubleshooting, we found that there are some performance bottlenecks in jobmaster. These bottlenecks are highly related to the complexity of the topology.
We implemented several benchmarks on these bottlenecks based on flink-benchmark. The topology of the benchmarks is a simple graph, which consists only two vertices: one source vertex and one sink vertex. They are both connected with all-to-all blocking edges. The parallelisms of the vertices are both 8k. The execution mode is batch. The results of the benchmarks are illustrated below:
Table 1: The result of benchmarks on bottlenecks in the jobmaster
| |*Time spent*|
|Build topology|19970.44 ms|
|Init scheduling strategy|41668.338 ms|
|Deploy tasks|15102.850 ms|
|Calculate failover region to restart|12080.271 ms|
We'd like to propose the benchmarks for procedures in the runtime module. There are three main benefits:
# They help us to understand the current status of task deployment performance and locate where the bottleneck is.
# We can use the benchmarks to evaluate the optimization in the future.
# As we run the benchmarks daily, they will help us to trace how the performance changes and locate the commit that introduces the performance regression if there is any.
In the first version of the benchmarks, we mainly focus on the procedures we mentioned above. The methods that is corresponding to the procedures are:
# Building topology: {{ExecutionGraph#attachJobGraph}}
# Initializing scheduling strategies: {{PipelinedRegionSchedulingStrategy#init}}
# Deploying tasks: {{Execution#deploy}}
# Calculating failover regions: {{RestartPipelinedRegionFailoverStrategy#getTasksNeedingRestart}}
The topology of benchmarks consist two vertices: source -> sink. They are connected with all-to-all edges. The result partition type ({{PIPELINED}} and {{BLOCKING}}) should be considered separately.
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