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From "Poorna Chandra (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (TEPHRA-199) Enforce maximum duration a transaction can be used for data writes
Date Wed, 28 Dec 2016 10:40:58 GMT

     [ https://issues.apache.org/jira/browse/TEPHRA-199?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Poorna Chandra resolved TEPHRA-199.
    Resolution: Fixed

> Enforce maximum duration a transaction can be used for data writes
> ------------------------------------------------------------------
>                 Key: TEPHRA-199
>                 URL: https://issues.apache.org/jira/browse/TEPHRA-199
>             Project: Tephra
>          Issue Type: Sub-task
>          Components: core
>            Reporter: Poorna Chandra
>            Assignee: Poorna Chandra
>             Fix For: 0.10.0-incubating
> Based on a comment from [~anew] in a PR [ 1 ] -
> Question: Suppose I start a transaction, which times out, and therefore goes into the
invalid list. A little later HBase performs a major compaction. This transaction and all its
writes are removed from the table by the DataJanitor. A little later TxManager prunes its
invalid transactions, and because this tx has been removed from HBase, it removes it from
the invalid list.
> The problem is if the program that started the transaction is still running. What if
it performs another write after the transaction pruning? This would be an invalid version,
but now it has been pruned from the invalid list and becomes visible.
> [ 1 ] - https://github.com/apache/incubator-tephra/pull/19#issuecomment-258645956

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