Conflicts With (N/A) 500 Internal server error

[Ashwini T R]

Hi,

We are facing issue as  "Conflicts With (N/A) 500 Internal server error" in multiple changes created in Gerrit for two different repositories.

Our gerrit server is running on version 2.13.2. 

Below is the stack trace output captured for one of the change having the above mentioned error. Please suggest how to resolve this issue.

[2017-06-09 15:56:28,552] [HTTP-645647] ERROR com.google.gerrit.httpd.restapi.RestApiServlet : Error in GET /changes/?q=status:open+is:mergeable+conflicts:117489&O=a

java.lang.NullPointerException: change 503 not found in ReviewDb

        at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:251)

        at com.google.gerrit.server.notedb.ChangeNotes$Factory.loadChangeFromDb(ChangeNotes.java:157)

        at com.google.gerrit.server.notedb.ChangeNotes$Factory.create(ChangeNotes.java:170)

        at com.google.gerrit.server.query.change.ChangeData.notes(ChangeData.java:759)

        at com.google.gerrit.server.query.change.ChangeData.reviewers(ChangeData.java:932)

        at com.google.gerrit.server.project.ChangeControl.isReviewer(ChangeControl.java:364)

        at com.google.gerrit.server.project.ChangeControl.isDraftVisible(ChangeControl.java:445)

        at com.google.gerrit.server.project.ChangeControl.isVisible(ChangeControl.java:211)

        at com.google.gerrit.server.query.change.ChangeIsVisibleToPredicate.match(ChangeIsVisibleToPredicate.java:67)

        at com.google.gerrit.server.query.change.ChangeIsVisibleToPredicate.match(ChangeIsVisibleToPredicate.java:27)

        at com.google.gerrit.server.query.AndSource.match(AndSource.java:147)

        at com.google.gerrit.server.query.AndSource.readImpl(AndSource.java:101)

        at com.google.gerrit.server.query.AndSource.read(AndSource.java:85)

        at com.google.gerrit.server.query.QueryProcessor.query(QueryProcessor.java:191)

        at com.google.gerrit.server.query.QueryProcessor.query(QueryProcessor.java:139)

        at com.google.gerrit.server.query.change.QueryChanges.query(QueryChanges.java:123)

        at com.google.gerrit.server.query.change.QueryChanges.apply(QueryChanges.java:94)

        at com.google.gerrit.server.query.change.QueryChanges.apply(QueryChanges.java:38)

        at com.google.gerrit.httpd.restapi.RestApiServlet.service(RestApiServlet.java:334)

        at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

        at com.google.inject.servlet.ServletDefinition.doServiceImpl(ServletDefinition.java:286)

        at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:276)

        at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:181)

        at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)

        at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:85)

        at com.google.gerrit.httpd.GetUserFilter.doFilter(GetUserFilter.java:82)

        at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)

        at com.google.gerrit.httpd.RequireSslFilter.doFilter(RequireSslFilter.java:77)

        at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)

        at com.google.gwtexpui.server.CacheControlFilter.doFilter(CacheControlFilter.java:73)

        at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)

        at com.google.gerrit.httpd.RunAsFilter.doFilter(RunAsFilter.java:122)

        at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)

        at com.google.gerrit.httpd.RequestMetricsFilter.doFilter(RequestMetricsFilter.java:60)

        at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)

        at com.google.gerrit.httpd.AllRequestFilter$FilterProxy$1.doFilter(AllRequestFilter.java:136)

        at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:201)

        at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:178)

        at com.googlesource.gerrit.plugins.javamelody.GerritMonitoringFilter.doFilter(GerritMonitoringFilter.java:65)

        at com.google.gerrit.httpd.AllRequestFilter$FilterProxy$1.doFilter(AllRequestFilter.java:132)

        at com.google.gerrit.httpd.AllRequestFilter$FilterProxy.doFilter(AllRequestFilter.java:105)

        at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)

        at com.google.gerrit.httpd.RequestContextFilter.doFilter(RequestContextFilter.java:75)

        at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)

        at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:120)

        at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:135)

        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)

        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)

        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)

        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)

        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)

        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)

        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)

        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)

        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)

        at org.eclipse.jetty.server.handler.RequestLogHandler.handle(RequestLogHandler.java:95)

        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)

        at org.eclipse.jetty.server.Server.handle(Server.java:499)

        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)

        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)

        at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)

        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)

        at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)

        at java.lang.Thread.run(Unknown Source)

Thanks

Ashwini

[Ashwini T R]

Hi Team,

Could some one suggest to resolve the issue ? The error shows as :

[2017-06-09 15:56:28,552] [HTTP-645647] ERROR com.google.gerrit.httpd.restapi.RestApiServlet : Error in GET /changes/?q=status:open+is:mergeable+conflicts:117489&O=a

java.lang.NullPointerException: change 503 not found in ReviewDb

But when the same is checked in reviewdb the review exists.

Regards

Ashwini

[Matthew Webber]

I think this might be partially fixed in 2.14 - see https://bugs.chromium.org/p/gerrit/issues/detail?id=4796

In particular, look at my Comment 4 , which mentions that the problem can be related to changes which are not visible (eg Draft changes)

Hope that helps

Matthew

[Ashwini T R]

Hi Matthew,

Could you please suggest any work around to get rid of that error : (: ( .

We are blocked with our development work

:(:(

Regards,

Ashwini

[Ashwini T R]

Hi,

Could someone suggest workaround for the issue "Conflicts With (N/A) 500 Internal server error" 

and below is the detailed log for the Changes which are having the issue.

[2017-06-19 09:22:35,539] [HTTP-119807] ERROR com.google.gerrit.httpd.restapi.RestApiServlet : Error in GET /changes/?q=status:open+is:mergeable+conflicts:153821&O=a

Regards,

Ashwini

[Remy Bohmer]

Hi,

I know about this error with partially deleted changes. Then either the change in the ReviewDb does not exist partially or not at all. It is still there in the secondary index. I did put together a plugin a couple of weeks ago to remove it from the secondary index which removes it from the UI as well (in case it does not exist in the ReviewDb).

In these cases a new reindex via the restapi of this failing change does not help solving the issue, but should be tried first.

Kind regards,

Remy

Op 19 jun. 2017 10:41 schreef "Ashwini T R" <ashu.r...@gmail.com>:

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[Ashwini T R]

Hi Remy,

Thanks a lot for providing the information. It would be helpful if you could share the plugin details to remove from the secondary index. 

Meantime, Is this the API https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#index-change for new reindex can be tried for  failing changes ?

Thanks,

Ashwini

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[Ashwini T R]

Hi Team,

We could also capture the UI console output errors for the changes with "Conflicts With (N/A) 500 Internal server error". Please find the attachment with the below errors:

"Failed to load resource: the server responded with the status of 404 (Not found) "

"Failed to load resource: the server responded a status of 500 (server error)"

Please suggest to resolve the issue.

Regards,

Ashwini

[Matthew Webber]

Did you look at the comment I mentioned in my original reply, and do you think that the problem in your case is related to changes that are not visible?

Or do you think it is come other case?