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https://issues.apache.org/jira/browse/CONNECTORS-299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13161079#comment-13161079
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Karl Wright commented on CONNECTORS-299:
----------------------------------------
r1209209 for infrastructure and deployment of that infrastructure in the place
we see in the exception listed above. Obviously many more places need to be
worked on before the ticket is in any sense complete.
> 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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