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From "Steve Loughran (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15944) S3AInputStream logging to make it easier to debug file leakage
Date Tue, 06 Oct 2020 10:31:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17208644#comment-17208644

Steve Loughran commented on HADOOP-15944:

Also: let's log the full stack trace of any caught EOF when read()/ readFully() catches an
EOF and downgrades it to a -1. This will help identify where EOFs are surfacing

> S3AInputStream logging to make it easier to debug file leakage
> --------------------------------------------------------------
>                 Key: HADOOP-15944
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15944
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.1.1
>            Reporter: Steve Loughran
>            Priority: Minor
> Problem: if an app opens too many input streams, then all the http connections in the
S3A pool can be used up; all attempts to do other FS operations fail timing out for http pool
> Proposed simple solution: log better what's going on with input stream lifecyce, specifically
> # include URL of file in open, reopen & close events
> # maybe: Separate logger for these events, though S3A Input stream should be enough as
it doesn't do much else.
> # maybe: have some prefix in the events like "Lifecycle", so that you could use the existing
log @ debug, grep for that phrase and look at the printed URLs to identify what's going on
> # stream metrics: expose some of the state of the http connection pool and/or active
input and output streams
> Idle output streams don't use up http connections, as they only connect during block

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