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Posted to common-issues@hadoop.apache.org by GitBox <gi...@apache.org> on 2020/08/10 09:43:02 UTC
[GitHub] [hadoop] mukund-thakur edited a comment on pull request #2207: HADOOP-17074 Optimise s3a Listing to be fully asynchronous.
mukund-thakur edited a comment on pull request #2207:
URL: https://github.com/apache/hadoop/pull/2207#issuecomment-671252550
Performance result using new test:
`2020-08-10 15:04:35,966 [JUnit-testMultiPagesListingPerformanceAndCorrectness] INFO contract.ContractTestUtils (ContractTestUtils.java:end(1847)) - Duration of listing 1000 files using listFiles() api with batch size of 10 including 10ms of processing time for each file: 12,039,952,465 nS
2020-08-10 15:04:52,170 [JUnit-testMultiPagesListingPerformanceAndCorrectness] INFO contract.ContractTestUtils (ContractTestUtils.java:end(1847)) - Duration of listing 1000 files using listStatus() api with batch size of 10 including 10ms of processing time for each file: 16,088,964,963 nS`
We can see an improvement of 4s with these configs.
Result when the same test is run in trunk having sync listing.
`2020-08-10 15:10:03,815 [JUnit-testMultiPagesListingPerformanceAndCorrectness] INFO contract.ContractTestUtils (ContractTestUtils.java:end(1847)) - Duration of listing 1000 files using listFiles() api with batch size of 10 including 10ms of processing time for each file: 16,722,638,860 nS
2020-08-10 15:10:20,293 [JUnit-testMultiPagesListingPerformanceAndCorrectness] INFO contract.ContractTestUtils (ContractTestUtils.java:end(1847)) - Duration of listing 1000 files using listStatus() api with batch size of 10 including 10ms of processing time for each file: 16,364,577,964 nS`
It is evident from the logs that without the improvements, listStatus and listFiles took same time.
CC @steveloughran @mehakmeet @bgaborg
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