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From "Alex Parvulescu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-3057) Simplify debugging conflict related errors
Date Thu, 09 Jul 2015 08:43:04 GMT

    [ https://issues.apache.org/jira/browse/OAK-3057?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14620136#comment-14620136
] 

Alex Parvulescu commented on OAK-3057:
--------------------------------------

bq. Its primary constructor must not be private though. I guess this is an oversight.
yes, leftover from the latest path change, will fix it

bq. Also I'd skip the if clause in ConflictValidator#enter as I doubt this to have much impact
but OTOH makes the code less robust.
agreed

I'm working on a new version which includes the log tests based on Chetan's feedback.

Are there other test scenarios it makes sense to include right away? My test is just one of
the options, the others had different concerns, so now it would be a great time to pick an
important one and have it tested.
We obviously have to include all conflict possibilities at some point but I'd like to start
with a few and build up from there.






> Simplify debugging conflict related errors
> ------------------------------------------
>
>                 Key: OAK-3057
>                 URL: https://issues.apache.org/jira/browse/OAK-3057
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core
>            Reporter: Chetan Mehrotra
>             Fix For: 1.3.3
>
>         Attachments: OAK-3057-v0.patch, OAK-3057-v1.patch, OAK-3057-v2.patch
>
>
> Many a times we see conflict exception in the logs like below. Looking at the stacktrace
its hard to reason out what was the conflict and hence harder to debug such issues. Oak should
provide more details as part of exception message itself to simplify debugging such issues.

> Note that such issues are intermittent and might happen in background processing logic.
So its required that all details should be made part of exception message itself as it would
not be possible to turn on any trace logging to get more details given the intermittent nature
of such issues
> {noformat}
> Caused by: org.apache.jackrabbit.oak.api.CommitFailedException: OakState0001: Unresolved
conflicts in /content/dam/news/images/2015/06/27/blue-sky.jpg
> 	at org.apache.jackrabbit.oak.plugins.commit.ConflictValidator.failOnMergeConflict(ConflictValidator.java:84)
> 	at org.apache.jackrabbit.oak.plugins.commit.ConflictValidator.propertyAdded(ConflictValidator.java:54)
> 	at org.apache.jackrabbit.oak.spi.commit.CompositeEditor.propertyAdded(CompositeEditor.java:83)
> 	at org.apache.jackrabbit.oak.spi.commit.EditorDiff.propertyAdded(EditorDiff.java:82)
> 	at org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:375)
> 	at org.apache.jackrabbit.oak.spi.commit.EditorDiff.childNodeChanged(EditorDiff.java:148)
> 	at org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:396)
> 	at org.apache.jackrabbit.oak.spi.commit.EditorDiff.childNodeChanged(EditorDiff.java:148)
> 	at org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:396)
> 	at org.apache.jackrabbit.oak.spi.commit.EditorDiff.childNodeChanged(EditorDiff.java:148)
> 	at org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:396)
> 	at org.apache.jackrabbit.oak.spi.commit.EditorDiff.childNodeChanged(EditorDiff.java:148)
> 	at org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:396)
> 	at org.apache.jackrabbit.oak.spi.commit.EditorDiff.childNodeChanged(EditorDiff.java:148)
> 	at org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:396)
> 	at org.apache.jackrabbit.oak.spi.commit.EditorDiff.childNodeChanged(EditorDiff.java:148)
> 	at org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:396)
> 	at org.apache.jackrabbit.oak.spi.commit.EditorDiff.childNodeChanged(EditorDiff.java:148)
> 	at org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:396)
> 	at org.apache.jackrabbit.oak.spi.commit.EditorDiff.childNodeChanged(EditorDiff.java:148)
> 	at org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:396)
> 	at org.apache.jackrabbit.oak.spi.commit.EditorDiff.process(EditorDiff.java:52)
> 	at org.apache.jackrabbit.oak.spi.commit.EditorHook.processCommit(EditorHook.java:54)
> 	at org.apache.jackrabbit.oak.spi.commit.CompositeHook.processCommit(CompositeHook.java:60)
> 	at org.apache.jackrabbit.oak.spi.commit.CompositeHook.processCommit(CompositeHook.java:60)
> 	at org.apache.jackrabbit.oak.spi.state.AbstractNodeStoreBranch$InMemory.merge(AbstractNodeStoreBranch.java:557)
> 	at org.apache.jackrabbit.oak.spi.state.AbstractNodeStoreBranch.merge0(AbstractNodeStoreBranch.java:329)
> 	at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch.merge(DocumentNodeStoreBranch.java:148)
> 	at org.apache.jackrabbit.oak.plugins.document.DocumentRootBuilder.merge(DocumentRootBuilder.java:159)
> 	at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.merge(DocumentNodeStore.java:1482)
> 	at org.apache.jackrabbit.oak.core.MutableRoot.commit(MutableRoot.java:247)
> {noformat}



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