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https://issues.apache.org/jira/browse/HADOOP-18971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17788807#comment-17788807
]
ASF GitHub Bot commented on HADOOP-18971:
-----------------------------------------
hadoop-yetus commented on PR #6270:
URL: https://github.com/apache/hadoop/pull/6270#issuecomment-1822931221
:confetti_ball: **+1 overall**
| Vote | Subsystem | Runtime | Logfile | Comment |
|:----:|----------:|--------:|:--------:|:-------:|
| +0 :ok: | reexec | 0m 46s | | Docker mode activated. |
|||| _ Prechecks _ |
| +1 :green_heart: | dupname | 0m 0s | | No case conflicting files
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| +0 :ok: | codespell | 0m 0s | | codespell was not available. |
| +0 :ok: | detsecrets | 0m 0s | | detect-secrets was not available.
|
| +1 :green_heart: | @author | 0m 0s | | The patch does not contain
any @author tags. |
| +1 :green_heart: | test4tests | 0m 0s | | The patch appears to
include 3 new or modified test files. |
|||| _ trunk Compile Tests _ |
| +1 :green_heart: | mvninstall | 47m 19s | | trunk passed |
| +1 :green_heart: | compile | 0m 36s | | trunk passed with JDK
Ubuntu-11.0.20.1+1-post-Ubuntu-0ubuntu120.04 |
| +1 :green_heart: | compile | 0m 34s | | trunk passed with JDK
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| +1 :green_heart: | checkstyle | 0m 29s | | trunk passed |
| +1 :green_heart: | mvnsite | 0m 38s | | trunk passed |
| +1 :green_heart: | javadoc | 0m 36s | | trunk passed with JDK
Ubuntu-11.0.20.1+1-post-Ubuntu-0ubuntu120.04 |
| +1 :green_heart: | javadoc | 0m 32s | | trunk passed with JDK
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| +1 :green_heart: | spotbugs | 1m 3s | | trunk passed |
| +1 :green_heart: | shadedclient | 37m 28s | | branch has no errors
when building and testing our client artifacts. |
|||| _ Patch Compile Tests _ |
| +1 :green_heart: | mvninstall | 0m 28s | | the patch passed |
| +1 :green_heart: | compile | 0m 29s | | the patch passed with JDK
Ubuntu-11.0.20.1+1-post-Ubuntu-0ubuntu120.04 |
| +1 :green_heart: | javac | 0m 29s | | the patch passed |
| +1 :green_heart: | compile | 0m 26s | | the patch passed with JDK
Private Build-1.8.0_382-8u382-ga-1~20.04.1-b05 |
| +1 :green_heart: | javac | 0m 26s | | the patch passed |
| +1 :green_heart: | blanks | 0m 0s | | The patch has no blanks
issues. |
| -0 :warning: | checkstyle | 0m 18s |
[/results-checkstyle-hadoop-tools_hadoop-azure.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6270/6/artifact/out/results-checkstyle-hadoop-tools_hadoop-azure.txt)
| hadoop-tools/hadoop-azure: The patch generated 9 new + 2 unchanged - 0
fixed = 11 total (was 2) |
| +1 :green_heart: | mvnsite | 0m 29s | | the patch passed |
| +1 :green_heart: | javadoc | 0m 25s | | the patch passed with JDK
Ubuntu-11.0.20.1+1-post-Ubuntu-0ubuntu120.04 |
| +1 :green_heart: | javadoc | 0m 24s | | the patch passed with JDK
Private Build-1.8.0_382-8u382-ga-1~20.04.1-b05 |
| +1 :green_heart: | spotbugs | 1m 1s | | the patch passed |
| +1 :green_heart: | shadedclient | 38m 17s | | patch has no errors
when building and testing our client artifacts. |
|||| _ Other Tests _ |
| +1 :green_heart: | unit | 2m 12s | | hadoop-azure in the patch
passed. |
| +1 :green_heart: | asflicense | 0m 33s | | The patch does not
generate ASF License warnings. |
| | | 138m 28s | | |
| Subsystem | Report/Notes |
|----------:|:-------------|
| Docker | ClientAPI=1.43 ServerAPI=1.43 base:
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6270/6/artifact/out/Dockerfile
|
| GITHUB PR | https://github.com/apache/hadoop/pull/6270 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall
mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets |
| uname | Linux c1238a49b4ab 5.15.0-88-generic #98-Ubuntu SMP Mon Oct 2
15:18:56 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / a7597ed0b5e281be9116d4714960f62e4ed0c306 |
| Default Java | Private Build-1.8.0_382-8u382-ga-1~20.04.1-b05 |
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/usr/lib/jvm/java-8-openjdk-amd64:Private
Build-1.8.0_382-8u382-ga-1~20.04.1-b05 |
| Test Results |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6270/6/testReport/ |
| Max. process+thread count | 579 (vs. ulimit of 5500) |
| modules | C: hadoop-tools/hadoop-azure U: hadoop-tools/hadoop-azure |
| Console output |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6270/6/console |
| versions | git=2.25.1 maven=3.6.3 spotbugs=4.2.2 |
| Powered by | Apache Yetus 0.14.0 https://yetus.apache.org |
This message was automatically generated.
> ABFS: Enable Footer Read Optimizations with Appropriate Footer Read Buffer
> Size
> -------------------------------------------------------------------------------
>
> Key: HADOOP-18971
> URL: https://issues.apache.org/jira/browse/HADOOP-18971
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/azure
> Affects Versions: 3.3.6
> Reporter: Anuj Modi
> Assignee: Anuj Modi
> Priority: Major
> Labels: pull-request-available
>
> Footer Read Optimization was introduced to Hadoop azure in this Jira:
> https://issues.apache.org/jira/browse/HADOOP-17347
> and was kept disabled by default.
> This PR is to enable footer reads by default based on the results of analysis
> performed as below:
> In our scale workload analysis, it was found that workloads working with
> Parquet (or for that matter OCR etc.) have a lot of footer reads. Footer
> reads here refers to the read operations done by workload to get the metadata
> of the parquet file which is required to understand where the actual data
> resides in the parquet.
> This whole process takes place in 3 steps:
> # Workload reads the last 8 bytes of parquet file to get the offset and size
> of the metadata which is present just above these 8 bytes.
> # Using that offset, workload reads the metadata to get the exact offset and
> length of data which it wants to read.
> # Workload performs the final read operation to get the data it wants to use
> for its purpose.
> Here the first two steps are metadata reads that can be combined into a
> single footer read. When workload tries to read certain last few bytes of
> data (let's say this value is footer size), driver will intelligently read
> some extra bytes above the footer size to cater to the next read which is
> going to come.
> Q. What is the footer size of file?
> A: 16KB. Any read request trying to get the data within last 16KB of the file
> will qualify for whole footer read. This value is enough to cater to all
> types of files including parquet, OCR, etc.
> Q. What is the buffer size to read when reading the footer?
> A. Let's call this footer read buffer size. Prior to this PR footer read
> buffer size was same as read buffer size (default 4MB). It was found that for
> most of the workload required footer size was only 256KB. i.e. For almost all
> parquet files metadata for that file was found to be within last 256KBs.
> Keeping this in mind it does not make sense to read whole buffer length of
> 4MB as a part of footer read. Moreover, reading larger data than require
> incur additional costs in terms of server and network latencies. Based on
> this and extensive experimentation it was observed that footer read buffer
> size of 512KB is ideal for almost all the workloads running on parquet, OCR,
> etc.
> Following configuration was introduced to configure the footer read buffer
> size:
> {*}fs.azure.footer.read.request.size{*}: default 512 KB.
> *Quantitative Stats:* For a workload running on parquet files the number of
> read requests got reduced by 2.3M down from 20M. That means around 10%
> reduction in overall TPS.
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