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https://issues.apache.org/jira/browse/CONNECTORS-734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13692076#comment-13692076
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Karl Wright commented on CONNECTORS-734:
----------------------------------------
On looking at the code in the caller, I found that the fix I had will not work.
r1496092 is a much better fix.
> EXPLAIN may require retry
> -------------------------
>
> Key: CONNECTORS-734
> URL: https://issues.apache.org/jira/browse/CONNECTORS-734
> Project: ManifoldCF
> Issue Type: Bug
> Affects Versions: ManifoldCF 1.2
> Environment: java version "1.6.0_31" Java HotSpot(TM) 64-Bit Server
> VM (build 20.6-b01)
> Red Hat Enterprise Linux Server release 5.7 (Tikanga)
> PostgreSQL version 9.2.8 running on Scientific Linux release 6.2 (Carbon)
> Reporter: Ahmet Arslan
> Assignee: Karl Wright
> Fix For: ManifoldCF 1.3
>
>
> {code}
> ERROR 2013-06-24 10:39:33,473 (Worker thread '1') - Explain failed with error
> Database exception: SQLException doing query (40001): ERROR: could not
> serialize access due to read/write dependencies among transactions
> Detail: Reason code: Canceled on identification as a pivot, during conflict
> out checking.
> Hint: The transaction might succeed if retried.
> org.apache.manifoldcf.core.interfaces.ManifoldCFException: Database
> exception: SQLException doing query (40001): ERROR: could not serialize
> access due to read/write dependencies among transactions
> Detail: Reason code: Canceled on identification as a pivot, during conflict
> out checking.
> Hint: The transaction might succeed if retried.
> at
> org.apache.manifoldcf.core.database.Database.executeViaThread(Database.java:717)
> at
> org.apache.manifoldcf.core.database.Database.executeUncachedQuery(Database.java:745)
> at
> org.apache.manifoldcf.core.database.DBInterfacePostgreSQL.explainQuery(DBInterfacePostgreSQL.java:1233)
> at
> org.apache.manifoldcf.core.database.Database$QueryCacheExecutor.create(Database.java:1449)
> at
> org.apache.manifoldcf.core.cachemanager.CacheManager.findObjectsAndExecute(CacheManager.java:144)
> at
> org.apache.manifoldcf.core.database.Database.executeQuery(Database.java:186)
> at
> org.apache.manifoldcf.core.database.DBInterfacePostgreSQL.performQuery(DBInterfacePostgreSQL.java:822)
> at
> org.apache.manifoldcf.crawler.jobs.JobManager.addDocuments(JobManager.java:4148)
> at
> org.apache.manifoldcf.crawler.system.WorkerThread$ProcessActivity.processDocumentReferences(WorkerThread.java:2017)
> at
> org.apache.manifoldcf.crawler.system.WorkerThread$ProcessActivity.flush(WorkerThread.java:1948)
> at
> org.apache.manifoldcf.crawler.system.WorkerThread.run(WorkerThread.java:562)
> Caused by: org.postgresql.util.PSQLException: ERROR: could not serialize
> access due to read/write dependencies among transactions
> Detail: Reason code: Canceled on identification as a pivot, during conflict
> out checking.
> Hint: The transaction might succeed if retried.
> at
> org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2102)
> at
> org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1835)
> at
> org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
> at
> org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:500)
> at
> org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:388)
> at
> org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:273)
> at
> org.apache.manifoldcf.core.database.Database.execute(Database.java:862)
> at
> org.apache.manifoldcf.core.database.Database$ExecuteQueryThread.run(Database.java:677)
> {code}
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