[jira] [Resolved] (HIVE-18662) hive.acid.key.index is missing entries

["Eugene Koifman (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-18662?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eugene Koifman resolved HIVE-18662.
-----------------------------------
       Resolution: Fixed
         Assignee: Eugene Koifman
    Fix Version/s: 3.0.0

fixed in HIVE-18817

> hive.acid.key.index is missing entries
> --------------------------------------
>
>                 Key: HIVE-18662
>                 URL: https://issues.apache.org/jira/browse/HIVE-18662
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>            Reporter: Eugene Koifman
>            Assignee: Eugene Koifman
>            Priority: Major
>             Fix For: 3.0.0
>
>
> OrcRecordUpdater.KeyIndexBuilder stores an index in ORC footer where each entry is the last ROW__ID of each stripe.  In acid1 this is used to filter the events from delta file when merging with part of the base.
>  
> as can be seen in {{TestTxnCommands.testVersioning()}} (added in HIVE-18659) the {{hive.acid.key.index}} is empty.  
>  
> This is because very little data is written and WriterImpl.flushStripe() is not called except when {
> {WriterImpl.close()}
> is called.  In the later, {{WriterCallback.preFooterWrite()}} is called before {{preStripeWrite}} and so KeyIndexBuilder.preFooterWriter() records nothing in \{{hive.acid.key.index}}
>  
> need to investigate if this is an issue, in particular acid 2



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