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https://issues.apache.org/jira/browse/HIVE-11317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14698822#comment-14698822
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Lefty Leverenz commented on HIVE-11317:
---------------------------------------
Doc note: This adds *hive.timedout.txn.reaper.start* and
*hive.timedout.txn.reaper.interval* to HiveConf.java, so they need to be
documented in the Configuration section of the Hive Transactions wikidoc and in
the Transactions and Compactor section of Configuration Properties. Adding a
TODOC1.3 label.
* [Hive Transactions -- Configuration |
https://cwiki.apache.org/confluence/display/Hive/Hive+Transactions#HiveTransactions-Configuration]
* [Configuration Properties -- Transactions and Compactor |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-TransactionsandCompactor]
> ACID: Improve transaction Abort logic due to timeout
> ----------------------------------------------------
>
> Key: HIVE-11317
> URL: https://issues.apache.org/jira/browse/HIVE-11317
> Project: Hive
> Issue Type: Bug
> Components: Metastore, Transactions
> Affects Versions: 1.0.0
> Reporter: Eugene Koifman
> Assignee: Eugene Koifman
> Labels: TODOC1.3, triage
> Fix For: 1.3.0
>
> Attachments: HIVE-11317.2.patch, HIVE-11317.3.patch,
> HIVE-11317.4.patch, HIVE-11317.5.patch, HIVE-11317.6.patch, HIVE-11317.patch
>
>
> the logic to Abort transactions that have stopped heartbeating is in
> TxnHandler.timeOutTxns()
> This is only called when DbTxnManger.getValidTxns() is called.
> So if there is a lot of txns that need to be timed out and the there are not
> SQL clients talking to the system, there is nothing to abort dead
> transactions, and thus compaction can't clean them up so garbage accumulates
> in the system.
> Also, streaming api doesn't call DbTxnManager at all.
> Need to move this logic into Initiator (or some other metastore side thread).
> Also, make sure it is broken up into multiple small(er) transactions against
> metastore DB.
> Also more timeOutLocks() locks there as well.
> see about adding TXNS.COMMENT field which can be used for "Auto aborted due
> to timeout" for example.
> The symptom of this is that the system keeps showing more and more Open
> transactions that don't seem to ever go away (and have no locks associated
> with them)
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