[
https://issues.apache.org/jira/browse/HBASE-15181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15151553#comment-15151553
]
Vladimir Rodionov commented on HBASE-15181:
-------------------------------------------
Sequence IDs can not be tiered. Yes? They are not time ranges
I think we need to enhance HFile/compactions to keep the oldest HFile creation
time (which is equals to creation time of a newly flashed store file or the
oldest creation time of files being compacted).
Then we can use this OLDEST_CREATION_TIME instead of maxTimestamp. We will use
date ranges for OLDEST_CREATION_TIME - not for date timestamps
There is one to one correlation between Seq Id and OLDEST_CREATION_TIME: the
ordering by OLDEST_CREATION_TIME and by sequence ID is the same.
> A simple implementation of date based tiered compaction
> -------------------------------------------------------
>
> Key: HBASE-15181
> URL: https://issues.apache.org/jira/browse/HBASE-15181
> Project: HBase
> Issue Type: New Feature
> Components: Compaction
> Reporter: Clara Xiong
> Assignee: Clara Xiong
> Fix For: 2.0.0, 1.3.0, 0.98.19
>
> Attachments: HBASE-15181-v1.patch, HBASE-15181-v2.patch
>
>
> This is a simple implementation of date-based tiered compaction similar to
> Cassandra's for the following benefits:
> 1. Improve date-range-based scan by structuring store files in date-based
> tiered layout.
> 2. Reduce compaction overhead.
> 3. Improve TTL efficiency.
> Perfect fit for the use cases that:
> 1. has mostly date-based date write and scan and a focus on the most recent
> data.
> 2. never or rarely deletes data.
> Out-of-order writes are handled gracefully so the data will still get to the
> right store file for time-range-scan and re-compacton with existing store
> file in the same time window is handled by ExploringCompactionPolicy.
> Time range overlapping among store files is tolerated and the performance
> impact is minimized.
> Configuration can be set at hbase-site or overriden at per-table or
> per-column-famly level by hbase shell.
> Design spec is at
> https://docs.google.com/document/d/1_AmlNb2N8Us1xICsTeGDLKIqL6T-oHoRLZ323MG_uy8/edit?usp=sharing
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
