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Date: Mon, 16 Oct 2017 13:29:00 +0000 (UTC)
From: "Ewan Higgs (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <JIRA.13017346.1478110604000.6212.1508160540421@Atlassian.JIRA>
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Subject: [jira] [Commented] (HADOOP-13786) Add S3Guard committer for
 zero-rename commits to S3 endpoints
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archived-at: Mon, 16 Oct 2017 13:29:05 -0000


    [ https://issues.apache.org/jira/browse/HADOOP-13786?page=3Dcom.atlassi=
an.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D16=
205884#comment-16205884 ]=20

Ewan Higgs commented on HADOOP-13786:
-------------------------------------

I've been testing this mostly from a performance point of view using Hadoop=
 MR2 using {{NullMetadataStore}} and I'm pretty happy with the results. It'=
s indeed twice as fast as the old style {{FileOutputCommitter}} on the syst=
em I used.

There's a lot of code here and it's been moving quite quickly but it's in o=
verall good shape, imo. As I'm using a {{NullMetadataStore}} a lot of the p=
ossible error scenarios won't popup for me so it will be great if people ca=
n cover those areas.

> Add S3Guard committer for zero-rename commits to S3 endpoints
> -------------------------------------------------------------
>
>                 Key: HADOOP-13786
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13786
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: fs/s3
>    Affects Versions: 3.0.0-beta1
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>         Attachments: HADOOP-13786-036.patch, HADOOP-13786-037.patch, HADO=
OP-13786-038.patch, HADOOP-13786-039.patch, HADOOP-13786-HADOOP-13345-001.p=
atch, HADOOP-13786-HADOOP-13345-002.patch, HADOOP-13786-HADOOP-13345-003.pa=
tch, HADOOP-13786-HADOOP-13345-004.patch, HADOOP-13786-HADOOP-13345-005.pat=
ch, HADOOP-13786-HADOOP-13345-006.patch, HADOOP-13786-HADOOP-13345-006.patc=
h, HADOOP-13786-HADOOP-13345-007.patch, HADOOP-13786-HADOOP-13345-009.patch=
, HADOOP-13786-HADOOP-13345-010.patch, HADOOP-13786-HADOOP-13345-011.patch,=
 HADOOP-13786-HADOOP-13345-012.patch, HADOOP-13786-HADOOP-13345-013.patch, =
HADOOP-13786-HADOOP-13345-015.patch, HADOOP-13786-HADOOP-13345-016.patch, H=
ADOOP-13786-HADOOP-13345-017.patch, HADOOP-13786-HADOOP-13345-018.patch, HA=
DOOP-13786-HADOOP-13345-019.patch, HADOOP-13786-HADOOP-13345-020.patch, HAD=
OOP-13786-HADOOP-13345-021.patch, HADOOP-13786-HADOOP-13345-022.patch, HADO=
OP-13786-HADOOP-13345-023.patch, HADOOP-13786-HADOOP-13345-024.patch, HADOO=
P-13786-HADOOP-13345-025.patch, HADOOP-13786-HADOOP-13345-026.patch, HADOOP=
-13786-HADOOP-13345-027.patch, HADOOP-13786-HADOOP-13345-028.patch, HADOOP-=
13786-HADOOP-13345-028.patch, HADOOP-13786-HADOOP-13345-029.patch, HADOOP-1=
3786-HADOOP-13345-030.patch, HADOOP-13786-HADOOP-13345-031.patch, HADOOP-13=
786-HADOOP-13345-032.patch, HADOOP-13786-HADOOP-13345-033.patch, HADOOP-137=
86-HADOOP-13345-035.patch, cloud-intergration-test-failure.log, objectstore=
.pdf, s3committer-master.zip
>
>
> A goal of this code is "support O(1) commits to S3 repositories in the pr=
esence of failures". Implement it, including whatever is needed to demonstr=
ate the correctness of the algorithm. (that is, assuming that s3guard provi=
des a consistent view of the presence/absence of blobs, show that we can co=
mmit directly).
> I consider ourselves free to expose the blobstore-ness of the s3 output s=
treams (ie. not visible until the close()), if we need to use that to allow=
 us to abort commit operations.


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