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Date: Wed, 12 Apr 2017 21:06:42 +0000 (UTC)
From: "Steve Loughran (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <JIRA.12994123.1470096591000.270106.1492031202018@Atlassian.JIRA>
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References: <JIRA.12994123.1470096591000@Atlassian.JIRA> <JIRA.12994123.1470096591569@jira-lw-us.apache.org>
Subject: [jira] [Commented] (HADOOP-13453) S3Guard: Instrument new
 functionality with Hadoop metrics.
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archived-at: Wed, 12 Apr 2017 21:06:47 -0000


    [ https://issues.apache.org/jira/browse/HADOOP-13453?page=3Dcom.atlassi=
an.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D15=
966617#comment-15966617 ]=20

Steve Loughran commented on HADOOP-13453:
-----------------------------------------

This is on my review todo list, don't think I've forgotten!=20

> 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-HA=
DOOP-13345-002.patch, HADOOP-13453-HADOOP-13345-003.patch
>
>
> Provide Hadoop metrics showing operational details of the S3Guard impleme=
ntation.
> The metrics will be implemented in this ticket:
> =E2=97=8F S3GuardRechecksNthPercentileLatency (MutableQuantiles) =C2=AD=
=E2=80=8B Percentile time spent
> in=C2=A0rechecks=C2=A0attempting to achieve consistency. Repeated for mul=
tiple percentile values
> of=C2=A0N.=C2=A0=C2=A0This=C2=A0metric=C2=A0is=C2=A0an indicator=C2=A0of =
the additional latency=C2=A0cost of running S3A with
> S3Guard.
> =E2=97=8F S3GuardRechecksNumOps (MutableQuantiles)=C2=A0=C2=AD=E2=80=8B N=
umber of times=C2=A0a consistency
> recheck=C2=A0was=C2=A0required while attempting to achieve consistency.
> =E2=97=8F S3GuardStoreNthPercentileLatency (MutableQuantiles) =C2=AD=E2=
=80=8B Percentile time spent in
> operations=C2=A0against the consistent store, including both write operat=
ions=C2=A0during file system
> mutations=C2=A0and=C2=A0read operations=C2=A0during file system=C2=A0cons=
istency=C2=A0checks. Repeated for
> multiple=C2=A0percentile=C2=A0values=C2=A0of N. This=C2=A0metric=C2=A0is=
=C2=A0an indicator of latency=C2=A0to the consistent
> store=C2=A0implementation.
> =E2=97=8F S3GuardConsistencyStoreNumOps (MutableQuantiles) =C2=AD=E2=80=
=8B Number of operations
> against=C2=A0the=C2=A0consistent store, including both write operations=
=C2=A0during file system mutations
> and=C2=A0read=C2=A0operations=C2=A0during file system=C2=A0consistency=C2=
=A0checks.
> =E2=97=8F S3GuardConsistencyStoreFailures (MutableCounterLong) =C2=AD=E2=
=80=8B Number of failures
> during=C2=A0operations=C2=A0against the consistent store implementation.
> =E2=97=8F S3GuardConsistencyStoreTimeouts (MutableCounterLong) =C2=AD=E2=
=80=8B Number of timeouts
> during=C2=A0operations=C2=A0against the consistent store implementation.
> =E2=97=8F S3GuardInconsistencies (MutableCounterLong)=C2=A0=C2=AD=C2=A0C=
=E2=80=8B ount of times=C2=A0S3Guard failed to
> achieve=C2=A0consistency, even after=C2=A0exhausting all rechecks. A high=
 count may=C2=A0indicate
> unexpected=C2=A0out=C2=ADof=C2=ADband modification of the S3 bucket conte=
nts, such as=C2=A0by=C2=A0an external
> tool=C2=A0that=C2=A0does=C2=A0not make corresponding updates=C2=A0to the =
consistent store.


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