Database Deadlocks While Listing Remote Refs

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症状

Polling Bitbucket Server repositories for changes on projects often fails with a 500 error. This corresponds to a MS SQL Server database deadlock report in the Bitbucket Server logs:

2013-08-15 23:54:44,053 ERROR [http-bio-80-exec-431] 1434x26560x2 10.1.65.60 "GET /mvc/error500 HTTP/1.1" c.a.s.i.web.ErrorPageController There was an unhandled exception loading [/scm/project/acme.git/info/refs]
com.atlassian.bitbucket.exception.DataStoreException: A database error has occurred.
        at com.atlassian.bitbucket.internal.aop.ExceptionRewriteAdvice.afterThrowing(ExceptionRewriteAdvice.java:41) ~[bitbucket-platform-2.6.0.jar:na]
        at sun.reflect.GeneratedMethodAccessor638.invoke(Unknown Source) ~[na:na]
[...]
Caused by: com.microsoft.sqlserver.jdbc.SQLServerException: Transaction (Process ID 100) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transac
tion.
        at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(SQLServerException.java:216) ~[sqljdbc-4.0.2206.jar:na]
        at com.microsoft.sqlserver.jdbc.SQLServerResultSet$FetchBuffer.nextRow(SQLServerResultSet.java:4853) ~[sqljdbc-4.0.2206.jar:na]

原因

The snapshot settings have not been applied when creating the database.

ソリューション

Stop Bitbucket Server and apply the following settings to your database:

ALTER DATABASE $(DATABASE) SET ALLOW_SNAPSHOT_ISOLATION ON
GO

ALTER DATABASE $(DATABASE) SET READ_COMMITTED_SNAPSHOT ON
GO

SET NOCOUNT OFF
GO

Setting the READ_COMMITTED_SNAPSHOT will wait until all active connections to the database are closed. Other active connections will block the query from running and it will appear as if the query is hung.

Last modified on Mar 30, 2016

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