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https://issues.apache.org/jira/browse/HADOOP-17313?focusedWorklogId=514259&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-514259
]
ASF GitHub Bot logged work on HADOOP-17313:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 19/Nov/20 18:15
Start Date: 19/Nov/20 18:15
Worklog Time Spent: 10m
Work Description: hadoop-yetus commented on pull request #2396:
URL: https://github.com/apache/hadoop/pull/2396#issuecomment-730550232
:broken_heart: **-1 overall**
| Vote | Subsystem | Runtime | Logfile | Comment |
|:----:|----------:|--------:|:--------:|:-------:|
| +0 :ok: | reexec | 0m 34s | | Docker mode activated. |
|||| _ Prechecks _ |
| +1 :green_heart: | dupname | 0m 0s | | No case conflicting files
found. |
| +0 :ok: | markdownlint | 0m 1s | | markdownlint was not available.
|
| +1 :green_heart: | @author | 0m 0s | | The patch does not contain
any @author tags. |
| +1 :green_heart: | | 0m 0s | [test4tests](test4tests) | The patch
appears to include 1 new or modified test files. |
|||| _ trunk Compile Tests _ |
| +0 :ok: | mvndep | 15m 44s | | Maven dependency ordering for branch |
| +1 :green_heart: | mvninstall | 22m 8s | | trunk passed |
| +1 :green_heart: | compile | 21m 46s | | trunk passed with JDK
Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 |
| +1 :green_heart: | compile | 17m 55s | | trunk passed with JDK
Private Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 |
| +1 :green_heart: | checkstyle | 2m 51s | | trunk passed |
| +1 :green_heart: | mvnsite | 2m 31s | | trunk passed |
| +1 :green_heart: | shadedclient | 21m 20s | | branch has no errors
when building and testing our client artifacts. |
| +1 :green_heart: | javadoc | 1m 31s | | trunk passed with JDK
Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 |
| +1 :green_heart: | javadoc | 2m 15s | | trunk passed with JDK
Private Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 |
| +0 :ok: | spotbugs | 1m 24s | | Used deprecated FindBugs config;
considering switching to SpotBugs. |
| +1 :green_heart: | findbugs | 3m 42s | | trunk passed |
|||| _ Patch Compile Tests _ |
| +0 :ok: | mvndep | 0m 27s | | Maven dependency ordering for patch |
| +1 :green_heart: | mvninstall | 1m 36s | | the patch passed |
| +1 :green_heart: | compile | 20m 55s | | the patch passed with JDK
Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 |
| +1 :green_heart: | javac | 20m 55s | | the patch passed |
| +1 :green_heart: | compile | 18m 9s | | the patch passed with JDK
Private Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 |
| +1 :green_heart: | javac | 18m 9s | | the patch passed |
| +1 :green_heart: | checkstyle | 2m 46s | | the patch passed |
| +1 :green_heart: | mvnsite | 2m 29s | | the patch passed |
| +1 :green_heart: | whitespace | 0m 0s | | The patch has no
whitespace issues. |
| +1 :green_heart: | shadedclient | 15m 44s | | patch has no errors
when building and testing our client artifacts. |
| +1 :green_heart: | javadoc | 1m 32s | | the patch passed with JDK
Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 |
| +1 :green_heart: | javadoc | 2m 21s | | the patch passed with JDK
Private Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 |
| +1 :green_heart: | findbugs | 3m 55s | | the patch passed |
|||| _ Other Tests _ |
| +1 :green_heart: | unit | 10m 0s | | hadoop-common in the patch
passed. |
| +1 :green_heart: | unit | 1m 40s | | hadoop-aws in the patch passed.
|
| -1 :x: | asflicense | 0m 56s |
[/patch-asflicense-problems.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2396/5/artifact/out/patch-asflicense-problems.txt)
| The patch generated 2 ASF License warnings. |
| | | 194m 37s | | |
| Subsystem | Report/Notes |
|----------:|:-------------|
| Docker | ClientAPI=1.40 ServerAPI=1.40 base:
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2396/5/artifact/out/Dockerfile
|
| GITHUB PR | https://github.com/apache/hadoop/pull/2396 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall
mvnsite unit shadedclient findbugs checkstyle markdownlint |
| uname | Linux 1c1e123c2239 4.15.0-60-generic #67-Ubuntu SMP Thu Aug 22
16:55:30 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / 34aa6137bd8 |
| Default Java | Private Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 |
| Multi-JDK versions |
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04
/usr/lib/jvm/java-8-openjdk-amd64:Private
Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 |
| Test Results |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2396/5/testReport/ |
| Max. process+thread count | 2427 (vs. ulimit of 5500) |
| modules | C: hadoop-common-project/hadoop-common hadoop-tools/hadoop-aws
U: . |
| Console output |
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2396/5/console |
| versions | git=2.17.1 maven=3.6.0 findbugs=4.0.6 |
| Powered by | Apache Yetus 0.13.0-SNAPSHOT https://yetus.apache.org |
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Issue Time Tracking
-------------------
Worklog Id: (was: 514259)
Time Spent: 4h (was: 3h 50m)
> FileSystem.get to support slow-to-instantiate FS clients
> --------------------------------------------------------
>
> Key: HADOOP-17313
> URL: https://issues.apache.org/jira/browse/HADOOP-17313
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs, fs/azure, fs/s3
> Affects Versions: 3.3.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Major
> Labels: pull-request-available
> Time Spent: 4h
> Remaining Estimate: 0h
>
> A recurrent problem in processes with many worker threads (hive, spark etc)
> is that calling `FileSystem.get(URI-to-object-store)` triggers the creation
> and then discard of many FS clients -all but one for the same URL. As well as
> the direct performance hit, this can exacerbate locking problems and make
> instantiation a lot slower than it would otherwise be.
> This has been observed with the S3A and ABFS connectors.
> The ultimate solution here would probably be something more complicated to
> ensure that only one thread was ever creating a connector for a given URL
> -the rest would wait for it to be initialized. This would (a) reduce
> contention & CPU, IO network load, and (b) reduce the time for all but the
> first thread to resume processing to that of the remaining time in
> .initialize(). This would also benefit the S3A connector.
> We'd need something like
> # A (per-user) map of filesystems being created <URI, FileSystem>
> # split createFileSystem into two: instantiateFileSystem and
> initializeFileSystem
> # each thread to instantiate the FS, put() it into the new map
> # If there was one already, discard the old one and wait for the new one to
> be ready via a call to Object.wait()
> # If there wasn't an entry, call initializeFileSystem) and then, finally,
> call Object.notifyAll(), and move it from the map of filesystems being
> initialized to the map of created filesystems
> This sounds too straightforward to be that simple; the troublespots are
> probably related to race conditions moving entries between the two maps and
> making sure that no thread will block on the FS being initialized while it
> has already been initialized (and so wait() will block forever).
> Rather than seek perfection, it may be safest go for a best-effort
> optimisation of the #of FS instances created/initialized. That is: its better
> to maybe create a few more FS instances than needed than it is to block
> forever.
> Something is doable here, it's just not quick-and-dirty. Testing will be
> "fun"; probably best to isolate this new logic somewhere where we can
> simulate slow starts on one thread with many other threads waiting for it.
> A simpler option would be to have a lock on the construction process: only
> one FS can be instantiated per user at a a time.
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