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From "Ai Deng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13453) S3Guard: Instrument new functionality with Hadoop metrics.
Date Sat, 25 Feb 2017 22:43:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15884420#comment-15884420
] 

Ai Deng commented on HADOOP-13453:
----------------------------------

Hi [~stevel@apache.org] Thank you for the information. I will keep adding more metrics. (still
on the S3Guard class level)

Regards of the metrics mentioned in the document (I have copied it to the Jira ticket), as
we consider the metadata in the store is "fresher", and use it first, we don't do any recheck(for
the inconsistent between S3 and metadata store) right? So the metrics "S3GuardRechecksNthPercentileLatency",
"S3GuardRechecksNumOps", "S3GuardInconsistencies" will not need any more.

For the Jenkins build, I can't find the "Submit" button on the Jira, it because my user permission
or I miss something?

> S3Guard: Instrument new functionality with Hadoop metrics.
> ----------------------------------------------------------
>
>                 Key: HADOOP-13453
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13453
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Chris Nauroth
>            Assignee: Ai Deng
>         Attachments: HADOOP-13453-HADOOP-13345-001.patch, HADOOP-13453-HADOOP-13345-002.patch
>
>
> Provide Hadoop metrics showing operational details of the S3Guard implementation.
> The metrics will be implemented in this ticket:
> ● S3GuardRechecksNthPercentileLatency (MutableQuantiles) ­​ Percentile time spent
> in rechecks attempting to achieve consistency. Repeated for multiple percentile values
> of N.  This metric is an indicator of the additional latency cost of running
S3A with
> S3Guard.
> ● S3GuardRechecksNumOps (MutableQuantiles) ­​ Number of times a consistency
> recheck was required while attempting to achieve consistency.
> ● S3GuardStoreNthPercentileLatency (MutableQuantiles) ­​ Percentile time spent in
> operations against the consistent store, including both write operations during file
system
> mutations and read operations during file system consistency checks. Repeated for
> multiple percentile values of N. This metric is an indicator of latency to the
consistent
> store implementation.
> ● S3GuardConsistencyStoreNumOps (MutableQuantiles) ­​ Number of operations
> against the consistent store, including both write operations during file system mutations
> and read operations during file system consistency checks.
> ● S3GuardConsistencyStoreFailures (MutableCounterLong) ­​ Number of failures
> during operations against the consistent store implementation.
> ● S3GuardConsistencyStoreTimeouts (MutableCounterLong) ­​ Number of timeouts
> during operations against the consistent store implementation.
> ● S3GuardInconsistencies (MutableCounterLong) ­ C​ ount of times S3Guard failed
to
> achieve consistency, even after exhausting all rechecks. A high count may indicate
> unexpected out­of­band modification of the S3 bucket contents, such as by an external
> tool that does not make corresponding updates to the consistent store.



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