hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "GAO Rui (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7661) Erasure coding: support hflush and hsync
Date Tue, 05 Jan 2016 04:42:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15082366#comment-15082366
] 

GAO Rui commented on HDFS-7661:
-------------------------------

See the {{4. Scenario 4: flush/sync was invoked more than one time in the same strip.}} in
[^HDFS-EC-file-flush-sync-design-version1.1.pdf]. Consider the follow events sequences:

1. flush at {{Flush point 2.1}}, parity internal block: PIB1, PIB2 and PIB3 were calculated.
2. flush at {{Flush point 2.1.1}}, PIB1 and PIB2 were updated to PIB1` and PIB 2`, but PIB3
failed in updating.
3. PIB1`, the first and third data internal block were down.
4. Read file.
5. Recovery the missing data internal block using PIB2` and PIB3.

There we got a problem to recovery data correctly. 

> Erasure coding: support hflush and hsync
> ----------------------------------------
>
>                 Key: HDFS-7661
>                 URL: https://issues.apache.org/jira/browse/HDFS-7661
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: GAO Rui
>         Attachments: EC-file-flush-and-sync-steps-plan-2015-12-01.png, HDFS-7661-unitTest-wip-trunk.patch,
HDFS-EC-file-flush-sync-design-version1.1.pdf
>
>
> We also need to support hflush/hsync and visible length. 



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message