Scalable Model Inference for Component-based System Logs
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PRINS is a technique for scalable model inference of component-based system logs. It divides the problem into inferring individual component models and then stitching them together. The paper evaluates PRINS on several systems and compares its execution time and accuracy to MINT, a state-of-the-art model inference tool. Results show that PRINS is significantly faster than MINT, especially on larger logs, with comparable accuracy. However, stitching component models can result in larger overall system models. The paper contributes an empirical evaluation of the PRINS technique and makes its implementation publicly available.
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Scalable Model Inference for Component-based System Logs
- 1. PRINS: Scalable Model Inference for Component-based System Logs* Donghwan Shin1), Domenico Bianculli2), and Lionel Briand2,3) 1) University of She ffi eld 2) University of Luxembourg 3) University of Ottawa * This presentation is for the Journal-First Track at ICSE 2023; the original paper was accepted in Empirical Software Engineering (EMSE) journal.
- 2. A B Y Z … Model Inference Technique ith execution 20190621.001 A 20190621.002 B 20190621.002 Z 20190621.002 B … ith execution 20190621.001 A 20190621.002 B 20190621.002 Z 20190621.002 B … ith execution 20221101.001 A 20221101.004 B 20221101.011 Z 20221101.013 B 20221101.101 Y … System Logs System Model Log = A sequence of log entries representing a single execution fl ow Too large Not Scalable Enough No Models 2
- 3. 081111 090711 25010 INFO dfs.DataNode$DataXceiver: Receiving block blk_5652408071925555972 src: /10.251.65.203:38382 dest: /10.251.65.203:50010 081111 090711 25181 INFO dfs.DataNode$DataXceiver: Receiving block blk_5652408071925555972 src: /10.251.27.63:54730 dest: /10.251.27.63:50010 081111 090711 25487 INFO dfs.DataNode$DataXceiver: Receiving block blk_5652408071925555972 src: /10.251.65.203:40305 dest: /10.251.65.203:50010 081111 090711 00031 INFO dfs.FSNamesystem: BLOCK* NameSystem.allocateBlock: /user/root/rand8/_temporary/part-00156. blk_5652408071925555972 081111 090756 25011 INFO dfs.DataNode$PacketResponder: PacketResponder 2 for block blk_5652408071925555972 terminating 081111 090756 25011 INFO dfs.DataNode$PacketResponder: Received block blk_5652408071925555972 of size 67108864 from /10.251.65.203 081111 090756 25184 INFO dfs.DataNode$PacketResponder: PacketResponder 0 for block blk_5652408071925555972 terminating 081111 090756 25184 INFO dfs.DataNode$PacketResponder: Received block blk_5652408071925555972 of size 67108864 from /10.251.27.63 081111 090756 25488 INFO dfs.DataNode$PacketResponder: PacketResponder 1 for block blk_5652408071925555972 terminating 081111 090756 25488 INFO dfs.DataNode$PacketResponder: Received block blk_5652408071925555972 of size 67108864 from /10.251.65.203 081111 090756 00027 INFO dfs.FSNamesystem: BLOCK* NameSystem.addStoredBlock: blockMap updated: 10.251.71.16:50010 is added to blk_5652408071925555972 081111 111345 00013 INFO dfs.DataBlockScanner: Veri fi cation succeeded for blk_5652408071925555972 Example HDFS Log Component IDs 3 Observation: Systems are often composed of multiple components
- 4. What if we infer INDIVIDUAL component models and then stitch them together? 4
- 5. System Logs eA 1 eA 2 eB 4 eB 4 eA 1 eA 2 eB 4 eA 1 eA 3 eB 5 eA 1 eA 2 eB 4 eB 4 eA 1 eA 2 eB 4 eA 1 eA 3 eB 5 ax bx dy dy ax bx dy ax cx ey PRINS: PRojection-INference-Stitching s0 s1 s2 s3 s4 a b c d e INference Model of x Model of y INference Component x Component y PRojection eA 1 eA 2 eA 1 eA 2 eA 1 eA 3 eA 1 eA 2 eA 1 eA 2 eA 1 eA 3 ax bx ax bx ax cx eB 4 eB 4 eB 4 eB 5 eB 4 eB 4 eB 4 eB 5 dy dy dy ey s0 s1 s2 a b c d s4 e Stitching System Model + (optional) Heuristic Determinisation (HD)
- 6. Research Questions • RQ1: How does the execution time of PRINS change according to the parallel inference tasks in the inference stage? • RQ2: How does the execution time of change according to parameter ? • RQ3: How does the accuracy of the models (in the form of gFSMs) generated by change according to parameter ? • RQ4: How fast is PRINS when compared to state-of-the-art model inference techniques? • RQ5: How accurate are the models generated by PRINS compared to those generated by state-of-the-art model inference techniques? HDu u HDu u 6 Parallel inference Heuristic Determinisation PRINS (compared to MINT)
- 7. Research Questions • RQ1: How does the execution time of PRINS change according to the parallel inference tasks in the inference stage? • RQ2: How does the execution time of change according to parameter ? • RQ3: How does the accuracy of the models (in the form of gFSMs) generated by change according to parameter ? • RQ4: How fast is PRINS when compared to state-of-the-art model inference techniques? • RQ5: How accurate are the models generated by PRINS compared to those generated by state-of-the-art model inference techniques? HDu u HDu u 7 Parallel inference Heuristic Determinisation PRINS (compared to MINT)
- 8. RQ4: Execution Time of PRINS compared to MINT 2 4 6 8 5 10 15 20 Execution Time (s) Hadoop MINT PRINS-N PRINS-P 2 4 6 8 0 5000 10000 HDFS MINT PRINS-N PRINS-P 2 4 6 8 0 5000 10000 15000 Linux MINT PRINS-N PRINS-P 2 4 0 2500 5000 7500 10000 Zookeeper MINT PRINS-N PRINS-P 2 4 6 8 Duplication Factor 0 5000 10000 15000 Execution Time (s) CoreSync MINT PRINS-N PRINS-P 2 4 6 8 Duplication Factor 2.5 5.0 7.5 10.0 12.5 NGLClient MINT PRINS-N PRINS-P 2 4 6 8 Duplication Factor 0 10000 20000 30000 Oobelib MINT PRINS-N PRINS-P 2 4 6 8 Duplication Factor 0 5000 10000 15000 PDApp MINT PRINS-N PRINS-P PRINS-N = PRINS with No parallel inference (HD is enabled to be fair with MINT) PRINS-P = PRINS with Parallel inference (HD is enabled to be fair with MINT) Duplication Factor = How many times each log is duplicated to increase the input log size systematically 8
- 9. RQ5: Accuracy of PRINS compared to MINT 9
- 10. Downside: Size of System Models 10
- 11. Contributions • Tame the scalability issue of model inference using divide-and-conquer. • Present an empirical evaluation of PRINS and its comparison with the state-of-the-art model inference tool. • It works especially well when the components appearing in di ff erent executions are similar. • Provide a publicly available implementation of PRINS. 11 Paper (Open Access) Replication Package