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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (HBASE-2265) HFile and Memstore should maintain minimum and maximum timestamps
Date Wed, 23 Jun 2010 09:15:52 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2265?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Gray reassigned HBASE-2265:
------------------------------------

    Assignee: Pranav Khaitan

Assigning to Pranav who is going to look into this.

> HFile and Memstore should maintain minimum and maximum timestamps
> -----------------------------------------------------------------
>
>                 Key: HBASE-2265
>                 URL: https://issues.apache.org/jira/browse/HBASE-2265
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Todd Lipcon
>            Assignee: Pranav Khaitan
>
> In order to fix HBASE-1485 and HBASE-29, it would be very helpful to have HFile and Memstore
track their maximum and minimum timestamps. This has the following nice properties:
> - for a straight Get, if an entry has been already been found with timestamp X, and X
>= HFile.maxTimestamp, the HFile doesn't need to be checked. Thus, the current fast behavior
of get can be maintained for those who use strictly increasing timestamps, but "correct" behavior
for those who sometimes write out-of-order.
> - for a scan, the "latest timestamp" of the storage can be used to decide which cell
wins, even if the timestamp of the cells is equal. In essence, rather than comparing timestamps,
instead you are able to compare tuples of (row timestamp, storage.max_timestamp)
> - in general, min_timestamp(storage A) >= max_timestamp(storage B) if storage A was
flushed after storage B.

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