phoerious opened a new pull request #15931:
URL: https://github.com/apache/beam/pull/15931


   I tinkered around with the built-in Boto3-based S3 integration in the Python 
SDK, since it turned out to be rather inefficient, which comes mostly from the 
fact that it creates a new range request for each chunk (inefficient even with 
`Connection: Keep-Alive`) and also relies on huge 16MB buffers (which isn't 
always optimal for latency in general or client apps which do their own 
buffering).
   
   This PR modifies the Boto3 client to keep track of a previously opened HTTP 
stream instead of creating a new connection/range request for each read.
   
   This implementation is more cache efficient also for the server, since it 
allocates only one long-lived stream for the whole S3 object instead of 
requesting a new range with each read.
   
   Here are a few benchmarks for reading a WARC file from our Ceph cluster and 
iterating all records with FastWARC. For comparison I chose the default buffer 
size (16MB) and a much smaller one (65536 bytes, FastWARCs default internal 
buffer size).
   
       old:
         5518.28 records/s (large buffer)
         760.86 records/s  (small buffer)
   
       new:
         6156.54 records/s (large buffer)
         9292.72 records/s (small buffer)
   
   With a small buffer, it's about 1.7x faster, with the large buffer it's 
still a bit faster, but not much, because the overhead of allocating and 
discarding large byte strings starts kicking in.
   
   The new S3 client also has a new optional constructor parameter for setting 
an initial offset. I don't know how else to expose this functionality, but it's 
way more efficient than opening a stream from the start and then seeking to the 
desired position. This is meant mainly for use cases where you implement your 
own `FileBasedSource`. Unfortunately, `FileBasedSource.open_file()` provides no 
interface for opening a file at a certain initial offset, but you can work 
around it by constructing your own `Client` and `S3IO` instances for `s3://` 
URLs.
   
   Disclaimer: There is no issue report for this, so I can't put it in the 
title and I also don't know whom to ping for review.
   
   ------------------------
   
   Thank you for your contribution! Follow this checklist to help us 
incorporate your contribution quickly and easily:
   
    - [ ] [**Choose 
reviewer(s)**](https://beam.apache.org/contribute/#make-your-change) and 
mention them in a comment (`R: @username`).
    - [ ] Format the pull request title like `[BEAM-XXX] Fixes bug in 
ApproximateQuantiles`, where you replace `BEAM-XXX` with the appropriate JIRA 
issue, if applicable. This will automatically link the pull request to the 
issue.
    - [ ] Update `CHANGES.md` with noteworthy changes.
    - [ ] If this contribution is large, please file an Apache [Individual 
Contributor License Agreement](https://www.apache.org/licenses/icla.pdf).
   
   See the [Contributor Guide](https://beam.apache.org/contribute) for more 
tips on [how to make review process 
smoother](https://beam.apache.org/contribute/#make-reviewers-job-easier).
   
   `ValidatesRunner` compliance status (on master branch)
   --------------------------------------------------------
   
   <table>
     <thead>
       <tr>
         <th>Lang</th>
         <th>ULR</th>
         <th>Dataflow</th>
         <th>Flink</th>
         <th>Samza</th>
         <th>Spark</th>
         <th>Twister2</th>
       </tr>
     </thead>
     <tbody>
       <tr>
         <td>Go</td>
         <td>---</td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Go/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Go/lastCompletedBuild/badge/icon";>
           </a>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Go_VR_Flink/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Go_VR_Flink/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Go_VR_Samza/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Go_VR_Samza/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Go_VR_Spark/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Go_VR_Spark/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>---</td>
       </tr>
       <tr>
         <td>Java</td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_ULR/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_ULR/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow/lastCompletedBuild/badge/icon?subject=V1";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow_Streaming/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow_Streaming/lastCompletedBuild/badge/icon?subject=V1+Streaming";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow_Java11/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow_Java11/lastCompletedBuild/badge/icon?subject=V1+Java+11";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_VR_Dataflow_V2/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_VR_Dataflow_V2/lastCompletedBuild/badge/icon?subject=V2";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_VR_Dataflow_V2_Streaming/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_VR_Dataflow_V2_Streaming/lastCompletedBuild/badge/icon?subject=V2+Streaming";>
           </a><br>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Flink/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Flink/lastCompletedBuild/badge/icon?subject=Java+8";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Flink_Java11/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Flink_Java11/lastCompletedBuild/badge/icon?subject=Java+11";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Flink_Batch/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Flink_Batch/lastCompletedBuild/badge/icon?subject=Portable";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Flink_Streaming/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Flink_Streaming/lastCompletedBuild/badge/icon?subject=Portable+Streaming";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Samza/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Samza/lastCompletedBuild/badge/icon";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Samza/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Samza/lastCompletedBuild/badge/icon?subject=Portable";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Spark/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Spark/lastCompletedBuild/badge/icon";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Spark_Batch/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Spark_Batch/lastCompletedBuild/badge/icon?subject=Portable";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_SparkStructuredStreaming/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_SparkStructuredStreaming/lastCompletedBuild/badge/icon?subject=Structured+Streaming";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Twister2/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Twister2/lastCompletedBuild/badge/icon";>
           </a>
         </td>
       </tr>
       <tr>
         <td>Python</td>
         <td>---</td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Py_VR_Dataflow/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Py_VR_Dataflow/lastCompletedBuild/badge/icon?subject=V1";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Py_VR_Dataflow_V2/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Py_VR_Dataflow_V2/lastCompletedBuild/badge/icon?subject=V2";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Py_ValCont/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Py_ValCont/lastCompletedBuild/badge/icon?subject=ValCont";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Python_PVR_Flink_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Python_PVR_Flink_Cron/lastCompletedBuild/badge/icon?subject=Portable";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Python_VR_Flink/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Python_VR_Flink/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Python_VR_Samza/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Python_VR_Samza/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Python_VR_Spark/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Python_VR_Spark/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>---</td>
       </tr>
       <tr>
         <td>XLang</td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Direct/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Direct/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Dataflow/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Dataflow/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Flink/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Flink/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Samza/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Samza/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Spark/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Spark/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>---</td>
       </tr>
     </tbody>
   </table>
   
   Examples testing status on various runners
   --------------------------------------------------------
   
   <table>
     <thead>
       <tr>
         <th>Lang</th>
         <th>ULR</th>
         <th>Dataflow</th>
         <th>Flink</th>
         <th>Samza</th>
         <th>Spark</th>
         <th>Twister2</th>
       </tr>
     </thead>
     <tbody>
       <tr>
         <td>Go</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
       </tr>
       <tr>
         <td>Java</td>
         <td>---</td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Java_Examples_Dataflow_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Java_Examples_Dataflow_Cron/lastCompletedBuild/badge/icon?subject=V1";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Java_Examples_Dataflow_Java11_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Java_Examples_Dataflow_Java11_Cron/lastCompletedBuild/badge/icon?subject=V1+Java11";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_Examples_Dataflow_V2/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_Examples_Dataflow_V2/lastCompletedBuild/badge/icon?subject=V2";>
           </a><br>
         </td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
       </tr>
       <tr>
         <td>Python</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
       </tr>
       <tr>
         <td>XLang</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
       </tr>
     </tbody>
   </table>
   
   Post-Commit SDK/Transform Integration Tests Status (on master branch)
   
------------------------------------------------------------------------------------------------
   
   <table>
     <thead>
       <tr>
         <th>Go</th>
         <th>Java</th>
         <th>Python</th>
       </tr>
     </thead>
     <tbody>
       <tr>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Go/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Go/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Python36/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Python36/lastCompletedBuild/badge/icon?subject=3.6";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Python37/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Python37/lastCompletedBuild/badge/icon?subject=3.7";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Python38/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Python38/lastCompletedBuild/badge/icon?subject=3.8";>
           </a>
         </td>
       </tr>
     </tbody>
   </table>
   
   Pre-Commit Tests Status (on master branch)
   
------------------------------------------------------------------------------------------------
   
   <table>
     <thead>
       <tr>
         <th>---</th>
         <th>Java</th>
         <th>Python</th>
         <th>Go</th>
         <th>Website</th>
         <th>Whitespace</th>
         <th>Typescript</th>
       </tr>
     </thead>
     <tbody>
       <tr>
         <td>Non-portable</td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Java_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Java_Cron/lastCompletedBuild/badge/icon";>
           </a><br>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Python_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Python_Cron/lastCompletedBuild/badge/icon?subject=Tests";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_PythonLint_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_PythonLint_Cron/lastCompletedBuild/badge/icon?subject=Lint";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_PythonDocker_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_PythonDocker_Cron/badge/icon?subject=Docker";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_PythonDocs_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_PythonDocs_Cron/badge/icon?subject=Docs";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Go_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Go_Cron/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Website_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Website_Cron/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Whitespace_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Whitespace_Cron/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Typescript_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Typescript_Cron/lastCompletedBuild/badge/icon";>
           </a>
         </td>
       </tr>
       <tr>
         <td>Portable</td>
         <td>---</td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Portable_Python_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Portable_Python_Cron/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_GoPortable_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_GoPortable_Cron/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
       </tr>
     </tbody>
   </table>
   
   See 
[.test-infra/jenkins/README](https://github.com/apache/beam/blob/master/.test-infra/jenkins/README.md)
 for trigger phrase, status and link of all Jenkins jobs.
   
   
   GitHub Actions Tests Status (on master branch)
   
------------------------------------------------------------------------------------------------
   [![Build python source distribution and 
wheels](https://github.com/apache/beam/workflows/Build%20python%20source%20distribution%20and%20wheels/badge.svg?branch=master&event=schedule)](https://github.com/apache/beam/actions?query=workflow%3A%22Build+python+source+distribution+and+wheels%22+branch%3Amaster+event%3Aschedule)
   [![Python 
tests](https://github.com/apache/beam/workflows/Python%20tests/badge.svg?branch=master&event=schedule)](https://github.com/apache/beam/actions?query=workflow%3A%22Python+Tests%22+branch%3Amaster+event%3Aschedule)
   [![Java 
tests](https://github.com/apache/beam/workflows/Java%20Tests/badge.svg?branch=master&event=schedule)](https://github.com/apache/beam/actions?query=workflow%3A%22Java+Tests%22+branch%3Amaster+event%3Aschedule)
   
   See [CI.md](https://github.com/apache/beam/blob/master/CI.md) for more 
information about GitHub Actions CI.
   


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