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From "Eugene Koifman (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-14350) Aborted txns cause false positive "Not enough history available..." msgs
Date Wed, 27 Jul 2016 18:09:20 GMT

     [ https://issues.apache.org/jira/browse/HIVE-14350?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eugene Koifman updated HIVE-14350:
----------------------------------
    Description: 
this is a followup to HIVE-13369.  Only open txns should prevent use of a base file.  But
ValidTxnList does not make a distinction between open and aborted txns.  The presence of aborted
txns causes false positives which can happen too often since the flow is 
1. Worker generates a new base file, 
2. then asynchronously Cleaner removes now-compacted aborted txns.  (strictly speaking it's
Initiator that does the actual clean up)

So we may have base_5 and base_10 and txnid 7 aborted.  Then current impl will disallow use
of base_10 though there is no need for that.  Worse, if txnid_4 is aborted and hasn't been
purged yet, base_5 will be rejected as well and then an error will be raised since there is
no suitable base file left.

ErrorMsg.ACID_NOT_ENOUGH_HISTORY is msg produced

  was:
this is a followup to HIVE-13369.  Only open txns should prevent use of a base file.  But
ValidTxnList does not make a distinction between open and aborted txns.  The presence of aborted
txns causes false positives which can happen too often since the flow is 1. Worker generates
a new base file, then asynchronously Cleaner removes now-compacted aborted txns.  So we may
have base_5 and base_10 and txnid 7 aborted.  Then current impl will disallow use of base_10
though there is no need for that.  Worse, if txnid_4 is aborted and hasn't been purged yet,
base_5 will be rejected as well and then an error will be raised since there is no suitable
base file left.

ErrorMsg.ACID_NOT_ENOUGH_HISTORY is msg produced


> Aborted txns cause false positive "Not enough history available..." msgs
> ------------------------------------------------------------------------
>
>                 Key: HIVE-14350
>                 URL: https://issues.apache.org/jira/browse/HIVE-14350
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>    Affects Versions: 1.3.0, 2.1.1
>            Reporter: Eugene Koifman
>            Assignee: Eugene Koifman
>            Priority: Critical
>         Attachments: HIVE-14350.2.patch, HIVE-14350.3.patch
>
>
> this is a followup to HIVE-13369.  Only open txns should prevent use of a base file.
 But ValidTxnList does not make a distinction between open and aborted txns.  The presence
of aborted txns causes false positives which can happen too often since the flow is 
> 1. Worker generates a new base file, 
> 2. then asynchronously Cleaner removes now-compacted aborted txns.  (strictly speaking
it's Initiator that does the actual clean up)
> So we may have base_5 and base_10 and txnid 7 aborted.  Then current impl will disallow
use of base_10 though there is no need for that.  Worse, if txnid_4 is aborted and hasn't
been purged yet, base_5 will be rejected as well and then an error will be raised since there
is no suitable base file left.
> ErrorMsg.ACID_NOT_ENOUGH_HISTORY is msg produced



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