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https://issues.apache.org/jira/browse/OAK-992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13756550#comment-13756550
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Michael Dürig commented on OAK-992:
-----------------------------------
I remember overhearing a discussion that the MongoMK internally "reuses" branch
revisions as real revisions after a merge somehow transmogrifying them along
the way. Could this be causing the observed cache corruption?
> NPE when running FlatTreeWithAceForSamePrincipalTest on MongoMK
> ---------------------------------------------------------------
>
> Key: OAK-992
> URL: https://issues.apache.org/jira/browse/OAK-992
> Project: Jackrabbit Oak
> Issue Type: Bug
> Reporter: Michael Dürig
>
> Running
> {code}
> benchmark FlatTreeWithAceForSamePrincipalTest Oak-Mongo
> {code}
> results in a NPE [1] after a couple of minutes.
> My initial analysis showed that {{MicroKernel.getNodes()}} returns {{null}}
> in {{KernelNodeState.init()}}. The requested revision was
> {{br140e35028e6-0-1}}, AFAICS a branch revision that doesn't exist any more.
> Looking at the base state in {{KernelNodeStoreBranch.InMemory.merge()}} a
> couple of stack frames below I found the following:
> {code}
> base = /@r140e350df05-0-1 children: 5 id: /@r140e350df05-0-1 ...
> base.getChildNode("a") = /a@r140e350df05-0-1 children: 9223372036854775807
> id: /a@r140e350df05-0-1 ...
> base.getChildNode("a").getChildNode("node9285") =
> /a/node9285@br140e35028e6-0-1 children: 1 id: /a/node9285@r140e34fdff7-0-1 ...
> {code}
> Obviously obtaining child {{node9285}} from {{/a}} switches from a trunk
> revision to a branch revision. This look suspicious.
> [1]
> {code}
> java.lang.NullPointerException
> at
> org.apache.jackrabbit.mk.json.JsopTokenizer.<init>(JsopTokenizer.java:41)
> at
> org.apache.jackrabbit.mk.json.JsopTokenizer.<init>(JsopTokenizer.java:47)
> at
> org.apache.jackrabbit.oak.kernel.KernelNodeState.init(KernelNodeState.java:160)
> at
> org.apache.jackrabbit.oak.kernel.KernelNodeState.getProperty(KernelNodeState.java:251)
> at
> org.apache.jackrabbit.oak.spi.state.AbstractNodeState.getName(AbstractNodeState.java:88)
> at
> org.apache.jackrabbit.oak.plugins.index.property.PropertyIndexEditor.isOfMatchingType(PropertyIndexEditor.java:165)
> at
> org.apache.jackrabbit.oak.plugins.index.property.PropertyIndexEditor.enter(PropertyIndexEditor.java:189)
> at
> org.apache.jackrabbit.oak.spi.commit.VisibleEditor.enter(VisibleEditor.java:58)
> at
> org.apache.jackrabbit.oak.spi.commit.CompositeEditor.enter(CompositeEditor.java:66)
> at
> org.apache.jackrabbit.oak.spi.commit.EditorDiff.process(EditorDiff.java:49)
> at
> org.apache.jackrabbit.oak.spi.commit.EditorDiff.childNodeDeleted(EditorDiff.java:141)
> at
> org.apache.jackrabbit.oak.plugins.memory.EmptyNodeState.compareAgainstBaseState(EmptyNodeState.java:139)
> at
> org.apache.jackrabbit.oak.spi.commit.EditorDiff.process(EditorDiff.java:52)
> at
> org.apache.jackrabbit.oak.spi.commit.EditorDiff.childNodeDeleted(EditorDiff.java:141)
> at
> org.apache.jackrabbit.oak.plugins.memory.EmptyNodeState.compareAgainstBaseState(EmptyNodeState.java:139)
> at
> org.apache.jackrabbit.oak.spi.commit.EditorDiff.process(EditorDiff.java:52)
> at
> org.apache.jackrabbit.oak.spi.commit.EditorDiff.childNodeDeleted(EditorDiff.java:141)
> at
> org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:380)
> at
> org.apache.jackrabbit.oak.spi.commit.EditorDiff.process(EditorDiff.java:52)
> at
> org.apache.jackrabbit.oak.spi.commit.EditorHook.processCommit(EditorHook.java:50)
> at
> org.apache.jackrabbit.oak.spi.commit.CompositeHook.processCommit(CompositeHook.java:59)
> at
> org.apache.jackrabbit.oak.spi.commit.CompositeHook.processCommit(CompositeHook.java:59)
> at
> org.apache.jackrabbit.oak.kernel.KernelNodeStoreBranch$InMemory.merge(KernelNodeStoreBranch.java:287)
> at
> org.apache.jackrabbit.oak.kernel.KernelNodeStoreBranch.merge(KernelNodeStoreBranch.java:136)
> at
> org.apache.jackrabbit.oak.core.AbstractRoot$2.run(AbstractRoot.java:245)
> at
> org.apache.jackrabbit.oak.core.AbstractRoot$2.run(AbstractRoot.java:241)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:337)
> at
> org.apache.jackrabbit.oak.core.AbstractRoot.commit(AbstractRoot.java:240)
> at
> org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.save(SessionDelegate.java:281)
> at
> org.apache.jackrabbit.oak.jcr.SessionImpl$8.perform(SessionImpl.java:394)
> at
> org.apache.jackrabbit.oak.jcr.SessionImpl$8.perform(SessionImpl.java:391)
> at
> org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.perform(SessionDelegate.java:117)
> at
> org.apache.jackrabbit.oak.jcr.SessionImpl.perform(SessionImpl.java:117)
> at org.apache.jackrabbit.oak.jcr.SessionImpl.save(SessionImpl.java:391)
> at
> org.apache.jackrabbit.oak.benchmark.FlatTreeWithAceForSamePrincipalTest.afterSuite(FlatTreeWithAceForSamePrincipalTest.java:89)
> at
> org.apache.jackrabbit.oak.benchmark.AbstractTest.tearDown(AbstractTest.java:165)
> at
> org.apache.jackrabbit.oak.benchmark.FlatTreeWithAceForSamePrincipalTest.tearDown(FlatTreeWithAceForSamePrincipalTest.java:31)
> at
> org.apache.jackrabbit.oak.benchmark.AbstractTest.runTest(AbstractTest.java:130)
> at
> org.apache.jackrabbit.oak.benchmark.AbstractTest.run(AbstractTest.java:91)
> at
> org.apache.jackrabbit.oak.benchmark.FlatTreeWithAceForSamePrincipalTest.run(FlatTreeWithAceForSamePrincipalTest.java:31)
> at
> org.apache.jackrabbit.oak.benchmark.BenchmarkRunner.main(BenchmarkRunner.java:126)
> at org.apache.jackrabbit.oak.run.Main.main(Main.java:61)
> {code}
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