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https://issues.apache.org/jira/browse/HADOOP-16721?focusedWorklogId=561031&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-561031
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ASF GitHub Bot logged work on HADOOP-16721:
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Author: ASF GitHub Bot
Created on: 04/Mar/21 17:50
Start Date: 04/Mar/21 17:50
Worklog Time Spent: 10m
Work Description: steveloughran opened a new pull request #2742:
URL: https://github.com/apache/hadoop/pull/2742
s3a rename to support
fs.s3a.rename.raises.exceptions: raise exceptions on rename failures
fs.s3a.rename.reduced.probes: don't look for parent dir (LIST), just verify
it isn't a file.
The reduced probe not only saves money, it avoids race conditions
where one thread deleting a subdir can cause LIST <parent> to fail before
a dir marker is recreated.
Note:
* file:// rename() creates parent dirs, so this isn't too dangerous.
* tests will switch modes.
We could always just do the HEAD; topic for discussion. This patch: optional
Change-Id: Ic0f8a410b45fef14ff522cb5aa1ae2bc19c8eeee
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Issue Time Tracking
-------------------
Worklog Id: (was: 561031)
Remaining Estimate: 0h
Time Spent: 10m
> Improve S3A rename resilience
> -----------------------------
>
> Key: HADOOP-16721
> URL: https://issues.apache.org/jira/browse/HADOOP-16721
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.2.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Improve rename resilience in two ways.
> h3. parent dir probes
> allow an option skip the LIST for the parent and just do HEAD object to makes
> sure it is not a file.
> h3. failure reporting
> the classic \{[rename(source, dest)}} operation returns \{{false}} on certain
> failures, which, while somewhat consistent with the posix APIs, turns out to
> be useless for identifying the cause of problems. Applications tend to have
> code which goes
> {code}
> if (!fs.rename(src, dest)) throw new IOException("rename failed");
> {code}
> While ultimately the rename/3 call needs to be made public (HADOOP-11452) it
> would then need a adoption across applications. We can do this in the hadoop
> modules, but for Hive, Spark etc it will take along time.
> Proposed: a switch to tell S3A to stop downgrading certain failures (source
> is dir, dest is file, src==dest, etc) into "false". This can be turned on
> when trying to diagnose why things like Hive are failing.
> Production code: trivial
> * change in rename(),
> * new option
> * docs.
> Test code:
> * need to clear this option for rename contract tests
> * need to create a new FS with this set to verify the various failure modes
> trigger it.
>
> If this works we should do the same for ABFS, GCS. Hey, maybe even HDFS
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