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From "Wei Zheng (JIRA)" <>
Subject [jira] [Updated] (HIVE-15376) Improve heartbeater scheduling for transactions
Date Thu, 15 Dec 2016 22:36:58 GMT


Wei Zheng updated HIVE-15376:
    Status: Patch Available  (was: Open)

> Improve heartbeater scheduling for transactions
> -----------------------------------------------
>                 Key: HIVE-15376
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>    Affects Versions: 2.2.0
>            Reporter: Wei Zheng
>            Assignee: Wei Zheng
>         Attachments: HIVE-15376.1.patch, HIVE-15376.2.patch, HIVE-15376.3.patch, HIVE-15376.4.patch,
HIVE-15376.5.patch, HIVE-15376.6.patch, HIVE-15376.7.patch, HIVE-15376.8.patch
> HIVE-12366 improved the heartbeater logic by bringing down the gap between the lock acquisition
and first heartbeat, but that's not enough, there may still be some issue, e.g.
>  Time A: a transaction is opened
>  Time B: acquireLocks is called (blocking call), but it can take a long time to actually
acquire the locks and return if the system is busy
>  Time C: as acquireLocks returns, the first heartbeat is sent
> If hive.txn.timeout < C - A, then the transaction will be timed out and aborted, thus
causing failure.

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