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https://issues.apache.org/jira/browse/ACCUMULO-3038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14135448#comment-14135448
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Christopher Tubbs commented on ACCUMULO-3038:
---------------------------------------------
I just looked into this a bit. I'm very surprised we're using Java
Serializable/ObjectOutputStream for fate objects, especially since it requires
serializing a bunch of referenced thrift classes. The TInfo class was
regenerated and changed in ACCUMULO-2773. Using Java Serializable is pretty
risky for generated classes, which cannot be strictly checked for compatibility
in serialization. We regenerate these classes all the time, even with
compatible changes. Thrift doesn't even bother setting its own serialVersionUID
in the generated classes, so it is computed from the class and can change quite
easily.
I didn't follow through all the code in fate, but I believe this happens when
there are outstanding fate operations? I'm not sure there's anything special
about downgrades, though. I think it could have happened on upgrade also. I'm
actually surprised we didn't hit this sooner... in 1.4.x or 1.5.x upgrades.
> java.lang.RuntimeException: java.io.InvalidClassException:
> org.apache.accumulo.trace.thrift.TInfo; local class incompatible
> ---------------------------------------------------------------------------------------------------------------------------
>
> Key: ACCUMULO-3038
> URL: https://issues.apache.org/jira/browse/ACCUMULO-3038
> Project: Accumulo
> Issue Type: Bug
> Components: fate
> Affects Versions: 1.6.0
> Reporter: Josh Elser
> Priority: Blocker
> Fix For: 1.6.1
>
>
> {noformat}
> 2014-08-01 14:37:38,278 [fate.Fate] ERROR: Thread "Repo runner 0" died
> java.lang.RuntimeException: java.io.InvalidClassException:
> org.apache.accumulo.trace.thrift.TInfo; local class incompatible: stream
> classdesc serialVersionUID = -8521079672965073252, local class
> serialVersionUID = -4659975753252858243idClassException:
> org.apache.accumulo.trace.thrift.TInfo; local class incompatible: stream
> classdesc serialVersionUID = -8521079672965073252, local class
> serialVersionUID =
> -4659975753252858243mulo.fate.ZooStore.top(ZooStore.java:266)
> at org.apache.accumulo.fate.AgeOffStore.top(AgeOffStore.java:172)
> at org.apache.accumulo.fate.Fate$TransactionRunner.run(Fate.java:58)
> at
> org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:34)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.RuntimeException: java.io.InvalidClassException:
> org.apache.accumulo.trace.thrift.TInfo; local class incompatible: stream
> classdesc serialVersionUID = -8521079672965073252, local class
> serialVersionUID = -4659975753252858243t
> org.apache.accumulo.fate.ZooStore.deserialize(ZooStore.java:79)
> at org.apache.accumulo.fate.ZooStore.top(ZooStore.java:262)
> ... 4 more
> Caused by: java.io.InvalidClassException:
> org.apache.accumulo.trace.thrift.TInfo; local class incompatible: stream
> classdesc serialVersionUID = -8521079672965073252, local class
> serialVersionUID = -4659975753252858243
> at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:617)
> at
> java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1622)
> at
> java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1517)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
> at
> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990)
> at
> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1915)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
> at org.apache.accumulo.fate.ZooStore.deserialize(ZooStore.java:77)
> ... 5 more
> {noformat}
> I'm not entirely positive what happened yet, but I believe the following is
> what happened.
> # Started up 1.6.0, loaded some data
> # Stopped 1.6.0
> # Started up 1.6.1-SNAPSHOT over the same instance to test some new code I
> was writing
> # Stopped 1.6.1-SNAPSHOT
> # Re-started 1.6.0 to run a demo
> # Above error
> My guess is that this is from the thrift 0.9.0 to 0.9.1 change for 1.6.1,
> which means that 1.6.1 cannot presently downgrade back to 1.6.0. I need to do
> some more testing to be sure, though.
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