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.
------------------------
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`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>
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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
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<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>
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</a><br>
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<img alt="Build Status"
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<img alt="Build Status"
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<img alt="Build Status"
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</a>
</td>
<td>
<a
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<img alt="Build Status"
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Spark/lastCompletedBuild/badge/icon">
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<img alt="Build Status"
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</td>
<td>
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</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"
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</a><br>
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<img alt="Build Status"
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</a>
</td>
<td>
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<img alt="Build Status"
src="https://ci-beam.apache.org/job/beam_PreCommit_Python_PVR_Flink_Cron/lastCompletedBuild/badge/icon?subject=Portable">
</a><br>
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</a>
</td>
<td>
<a
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<img alt="Build Status"
src="https://ci-beam.apache.org/job/beam_PostCommit_Python_VR_Samza/lastCompletedBuild/badge/icon">
</a>
</td>
<td>
<a
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<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>
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<img alt="Build Status"
src="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Dataflow/lastCompletedBuild/badge/icon">
</a>
</td>
<td>
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</a>
</td>
<td>
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<img alt="Build Status"
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</a>
</td>
<td>
<a
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<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
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<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>
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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>
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</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/">
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src="https://ci-beam.apache.org/job/beam_PreCommit_Java_Cron/lastCompletedBuild/badge/icon">
</a><br>
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<td>
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</a><br>
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</td>
<td>
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<td>
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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/">
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<td>
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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"
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</td>
<td>
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<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
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