[jira] [Resolved] (CONNECTORS-299) Crawling using Postgresql 9.1 hangs occasionally for a while

["Karl Wright (Resolved) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CONNECTORS-299?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Karl Wright resolved CONNECTORS-299.
------------------------------------

    Resolution: Fixed
    
> Crawling using Postgresql 9.1 hangs occasionally for a while
> ------------------------------------------------------------
>
>                 Key: CONNECTORS-299
>                 URL: https://issues.apache.org/jira/browse/CONNECTORS-299
>             Project: ManifoldCF
>          Issue Type: Bug
>          Components: Framework core
>    Affects Versions: ManifoldCF 0.4
>            Reporter: Karl Wright
>            Assignee: Karl Wright
>             Fix For: ManifoldCF 0.4
>
>
> The hang takes place because of this postgresql error:
> ERROR 2011-11-28 14:46:23,959 (Worker thread '25') - Worker thread aborting and restarting due to database connection reset: Database exception: Exception doing query: ERROR: could not serialize access due to read/write dependencies among transactions
>  Detail: Reason code: Canceled on identification as a pivot, during commit attempt.
>  Hint: The transaction might succeed if retried.
> org.apache.manifoldcf.core.interfaces.ManifoldCFException: Database exception: Exception doing query: ERROR: could not serialize access due to read/write dependencies among transactions
>  Detail: Reason code: Canceled on identification as a pivot, during commit attempt.
>  Hint: The transaction might succeed if retried.
>        at org.apache.manifoldcf.core.database.Database.executeViaThread(Database.java:608)
>        at org.apache.manifoldcf.core.database.DBInterfacePostgreSQL.commitCurrentTransaction(DBInterfacePostgreSQL.java:1141)
>        at org.apache.manifoldcf.core.database.Database.endTransaction(Database.java:321)
>        at org.apache.manifoldcf.core.database.DBInterfacePostgreSQL.endTransaction(DBInterfacePostgreSQL.java:1112)
>        at org.apache.manifoldcf.crawler.jobs.JobManager.finishDocuments(JobManager.java:4072)
>        at org.apache.manifoldcf.crawler.system.WorkerThread.run(WorkerThread.java:567)
> Caused by: org.postgresql.util.PSQLException: ERROR: could not serialize access due to read/write dependencies among transactions
> This is happening during the commit phase of the transaction, at a point where none of the transaction blocks in ManifoldCF know to look for it. It is therefore likely that all transaction blocks throughout ManifoldCF that deal with deadlock will need to be changed.

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