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[GitHub] [pinot] richardstartin opened a new pull request #7797: use `LZ4_LENGTH_PREFIXED` as default compression mode

richardstartin opened a new pull request #7797:
URL: https://github.com/apache/pinot/pull/7797


   * adds a simple benchmark to compare compression modes (and chunk format v3 vs v4)
   * defaults to `LZ4_WITH_LENGTH` everywhere, except when constructing readers for v1 chunks where `SNAPPY` was implicit
   * Parameterises a few tests where `SNAPPY` was assumed to make sure things still work with other compression settings.


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[GitHub] [pinot] richardstartin commented on pull request #7797: use `LZ4_LENGTH_PREFIXED` as default compression mode

Posted by GitBox <gi...@apache.org>.
richardstartin commented on pull request #7797:
URL: https://github.com/apache/pinot/pull/7797#issuecomment-973411524


   > I have some concern on changing the default to L4Z_LENGTH_PREFIXED because it is recently added and can potentially cause problem if segment creator gets the new version first.
   Let's wait after 0.9 is released and add this in 0.10.0. We should also consider changing the default writer version to 4 which is much more efficient than 2
   
   The V4 chunk writer automatically upgrades `LZ4` to `LZ4_LENGTH_PREFIXED` so I could just change it `LZ4` instead


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[GitHub] [pinot] richardstartin edited a comment on pull request #7797: use `LZ4` as default compression mode

Posted by GitBox <gi...@apache.org>.
richardstartin edited a comment on pull request #7797:
URL: https://github.com/apache/pinot/pull/7797#issuecomment-974519284


   > LZ4 gives nearly same (and even better sometimes) the compression ratio compared to SNAPPY and the time to compress is much faster.
   
   > ZSTD on the other hand as highest compression ratio (from our tests) but compression/decompression time was higher as well
   
   This is consistent with my experience, but it’s worth noting LZ4 has 16 compression levels which trade speed for ratio, and we default to level 1, whereas beyond level 3 a high compression mode is used - if ratio is really important the level could be exposed as a config parameter. But right now the motivation is faster decompression by default, rather than smaller file sizes.


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[GitHub] [pinot] Jackie-Jiang merged pull request #7797: use `LZ4` as default compression mode

Posted by GitBox <gi...@apache.org>.
Jackie-Jiang merged pull request #7797:
URL: https://github.com/apache/pinot/pull/7797


   


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[GitHub] [pinot] siddharthteotia commented on pull request #7797: use `LZ4` as default compression mode

Posted by GitBox <gi...@apache.org>.
siddharthteotia commented on pull request #7797:
URL: https://github.com/apache/pinot/pull/7797#issuecomment-974510937


   Nice. When we had added support for ZSTD and LZ4 compression types in https://github.com/apache/pinot/issues/6804, our perf testing also had similar results. LZ4 gives nearly same (and even better sometimes) the compression ratio compared to SNAPPY but the time to compress is much faster. 
   
   ZSTD on the other hand as highest compression ratio (from our tests) but compression/decompression time was higher as well
   
   Here are the results for reference - https://docs.google.com/document/d/1ie4JmVofk2o6ryCX7T4aD7GsRPKS651mroXhDk41wys/edit


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[GitHub] [pinot] siddharthteotia edited a comment on pull request #7797: use `LZ4` as default compression mode

Posted by GitBox <gi...@apache.org>.
siddharthteotia edited a comment on pull request #7797:
URL: https://github.com/apache/pinot/pull/7797#issuecomment-974510937


   Nice. When we had added support for ZSTD and LZ4 compression types in https://github.com/apache/pinot/issues/6804, our perf testing also had similar results. 
   
   LZ4 gives nearly same (and even better sometimes) the compression ratio compared to SNAPPY and the time to compress is much faster. 
   
   ZSTD on the other hand as highest compression ratio (from our tests) but compression/decompression time was higher as well
   
   Here are the results for reference (I think these were addd to JMH benchmarks as well) https://docs.google.com/document/d/1ie4JmVofk2o6ryCX7T4aD7GsRPKS651mroXhDk41wys/edit


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[GitHub] [pinot] codecov-commenter commented on pull request #7797: use `LZ4` as default compression mode

Posted by GitBox <gi...@apache.org>.
codecov-commenter commented on pull request #7797:
URL: https://github.com/apache/pinot/pull/7797#issuecomment-973479443


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     Branches      12001    11798      -203     
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[GitHub] [pinot] richardstartin commented on pull request #7797: use `LZ4` as default compression mode

Posted by GitBox <gi...@apache.org>.
richardstartin commented on pull request #7797:
URL: https://github.com/apache/pinot/pull/7797#issuecomment-974519284


   > LZ4 gives nearly same (and even better sometimes) the compression ratio compared to SNAPPY and the time to compress is much faster.
   
   > ZSTD on the other hand as highest compression ratio (from our tests) but compression/decompression time was higher as well
   This is consistent with my experience, but it’s worth noting LZ4 has 16 compression levels which trade speed for ratio, and we default to level 1, whereas beyond level 3 a high compression mode is used - if ratio is really important the level could be exposed as a config parameter. But right now the motivation is faster decompression by default, rather than smaller file sizes.


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[GitHub] [pinot] codecov-commenter edited a comment on pull request #7797: use `LZ4` as default compression mode

Posted by GitBox <gi...@apache.org>.
codecov-commenter edited a comment on pull request #7797:
URL: https://github.com/apache/pinot/pull/7797#issuecomment-973479443


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   > Merging [#7797](https://codecov.io/gh/apache/pinot/pull/7797?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (7d65dfb) into [master](https://codecov.io/gh/apache/pinot/commit/b809043d573b0457e38021e0b4ce8eec676f9afe?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (b809043) will **decrease** coverage by `6.50%`.
   > The diff coverage is `50.00%`.
   
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   @@             Coverage Diff              @@
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   ============================================
   - Coverage     71.70%   65.20%   -6.51%     
   - Complexity     4078     4083       +5     
   ============================================
     Files          1578     1533      -45     
     Lines         80777    78907    -1870     
     Branches      12001    11798     -203     
   ============================================
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