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From "Mikhail Antonov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15454) Archive store files older than max age
Date Thu, 12 May 2016 04:32:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15281196#comment-15281196

Mikhail Antonov commented on HBASE-15454:

Thanks Duo. In general, how uhm..much less convenient/useful for you/fast  are DT compactions
without this?

> Archive store files older than max age
> --------------------------------------
>                 Key: HBASE-15454
>                 URL: https://issues.apache.org/jira/browse/HBASE-15454
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Compaction
>    Affects Versions: 2.0.0, 1.3.0, 0.98.18, 1.4.0
>            Reporter: Duo Zhang
>            Assignee: Duo Zhang
>             Fix For: 2.0.0, 1.3.0, 1.4.0, 0.98.20
>         Attachments: HBASE-15454-v1.patch, HBASE-15454-v2.patch, HBASE-15454-v3.patch,
HBASE-15454-v4.patch, HBASE-15454-v5.patch, HBASE-15454-v6.patch, HBASE-15454-v7.patch, HBASE-15454.patch
> In date tiered compaction, the store files older than max age are never touched by minor
compactions. Here we introduce a 'freeze window' operation, which does the follow things:
> 1. Find all store files that contains cells whose timestamp are in the give window.
> 2. Compaction all these files and output one file for each window that these files covered.
> After the compaction, we will have only one in the give window, and all cells whose timestamp
are in the give window are in the only file. And if you do not write new cells with an older
timestamp in this window, the file will never be changed. This makes it easier to do erasure
coding on the freezed file to reduce redundence. And also, it makes it possible to check consistency
between master and peer cluster incrementally.
> And why use the word 'freeze'?
> Because there is already an 'HFileArchiver' class. I want to use a different word to
prevent confusing.

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