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https://issues.apache.org/jira/browse/HADOOP-19205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17863367#comment-17863367
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ASF GitHub Bot commented on HADOOP-19205:
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steveloughran commented on PR #6892:
URL: https://github.com/apache/hadoop/pull/6892#issuecomment-2211088408
will do, i've been off all week.
merged. will cherrypick.
note that apart from reported close() problems related to netty threads,
it'd make sense to just have one client...this patch only reduces costs if
rename() isn't used.
Before/while doing that, all interactions with the store should be pushed
into the S3Store interface, so the rest of the code never gets direct access to
S3Client
> S3A initialization/close slower than with v1 SDK
> ------------------------------------------------
>
> Key: HADOOP-19205
> URL: https://issues.apache.org/jira/browse/HADOOP-19205
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.4.0
> Reporter: Steve Loughran
> Priority: Major
> Labels: pull-request-available
> Attachments: Screenshot 2024-06-14 at 17.12.59.png, Screenshot
> 2024-06-14 at 17.14.33.png
>
>
> Hive QE have observed slowdown in LLAP queries due to time to create and
> close s3a filesystems instances. A key aspect of that is they keep closing
> the fs instances (HIVE-27884), but looking at the profiles, the reason things
> seem to have regressed is
> * two s3 clients are being created (sync and async)
> * these seem to take a lot of time scanning the classpath for "global
> interceptors", which is at least an O(jars) operation; #of index entries in
> the zip files may factor too.
> Proposed:
> * create async client on demand when the transfer manager is invoked
> * look at why passwords are being scanned for if
> InstanceProfileCredentialsProvider is in use...that seems slow too
> SDK wishes
> * SDK maybe allow us to turn off that scan for interceptors?
> attaching screenshots of the profile. storediag snippet:
> {code}
> [001] fs.s3a.access.key = (unset)
> [002] fs.s3a.secret.key = (unset)
> [003] fs.s3a.session.token = (unset)
> [004] fs.s3a.server-side-encryption-algorithm = (unset)
> [005] fs.s3a.server-side-encryption.key = (unset)
> [006] fs.s3a.encryption.algorithm = (unset)
> [007] fs.s3a.encryption.key = (unset)
> [008] fs.s3a.aws.credentials.provider =
> "com.amazonaws.auth.InstanceProfileCredentialsProvider" [core-site.xml]
> {code}
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