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https://issues.apache.org/jira/browse/HIVE-12366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15103626#comment-15103626
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Lefty Leverenz commented on HIVE-12366:
---------------------------------------

Doc note:  This adds *hive.txn.heartbeat.threadpool.size* to HiveConf.java in 
1.3.0 and 2.1.0 (and perhaps 2.0.0) so it needs to be documented in 
Configuration Properties and the Hive Transactions doc.

* [Configuration Properties -- Transactions and Compactor | 
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-TransactionsandCompactor]
* [Hive Transactions -- Configuration | 
https://cwiki.apache.org/confluence/display/Hive/Hive+Transactions#HiveTransactions-Configuration]

> Refactor Heartbeater logic for transaction
> ------------------------------------------
>
>                 Key: HIVE-12366
>                 URL: https://issues.apache.org/jira/browse/HIVE-12366
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>            Reporter: Wei Zheng
>            Assignee: Wei Zheng
>              Labels: TODOC1.3
>         Attachments: HIVE-12366.1.patch, HIVE-12366.11.patch, 
> HIVE-12366.12.patch, HIVE-12366.13.patch, HIVE-12366.14.patch, 
> HIVE-12366.15.patch, HIVE-12366.2.patch, HIVE-12366.3.patch, 
> HIVE-12366.4.patch, HIVE-12366.5.patch, HIVE-12366.6.patch, 
> HIVE-12366.7.patch, HIVE-12366.8.patch, HIVE-12366.9.patch, 
> HIVE-12366.branch-1.patch, HIVE-12366.branch-2.0.patch
>
>
> Currently there is a gap between the time locks acquisition and the first 
> heartbeat being sent out. Normally the gap is negligible, but when it's big 
> it will cause query fail since the locks are timed out by the time the 
> heartbeat is sent.
> Need to remove this gap.



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