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https://issues.apache.org/jira/browse/HBASE-15454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15356292#comment-15356292
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Duo Zhang commented on HBASE-15454:
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I haven't tested this in a real cluster yet...
And one thing I found is that the freeze window boundaries in HFile's metadata
are useless. I need to consider lots of other properties to decide whether I
can do EC on a storefile.
I will post new patches if we begin to deploy DTCS in real cluster(maybe
several months later...).
And we can also track this jira for more production experience I think.
https://issues.apache.org/jira/browse/CASSANDRA-10195
Thanks.
> 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, 1.4.0, 0.98.21
>
> 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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