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https://issues.apache.org/jira/browse/HBASE-14783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14994816#comment-14994816
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Matteo Bertozzi commented on HBASE-14783:
-----------------------------------------
we can change the title to change the load code, my step 3. which was something
that I was going to do anyway just to save some ops on load
> Proc-V2: Master aborts when downgrading from 1.3 to 1.1
> -------------------------------------------------------
>
> Key: HBASE-14783
> URL: https://issues.apache.org/jira/browse/HBASE-14783
> Project: HBase
> Issue Type: Bug
> Reporter: Ted Yu
> Assignee: Stephen Yuan Jiang
>
> I was running ITBLL with 1.3 deployed on a 6 node cluster.
> Then I stopped the cluster, deployed 1.1 release and tried to start cluster.
> However, master failed to start due to:
> {code}
> 2015-11-06 00:58:40,351 FATAL [eval-test-2:20000.activeMasterManager]
> master.HMaster: Failed to become active master
> java.io.IOException: The procedure class
> org.apache.hadoop.hbase.master.procedure.ServerCrashProcedure must be
> accessible and have an empty constructor
> at
> org.apache.hadoop.hbase.procedure2.Procedure.newInstance(Procedure.java:548)
> at org.apache.hadoop.hbase.procedure2.Procedure.convert(Procedure.java:640)
> at
> org.apache.hadoop.hbase.procedure2.store.wal.ProcedureWALFormatReader.read(ProcedureWALFormatReader.java:105)
> at
> org.apache.hadoop.hbase.procedure2.store.wal.ProcedureWALFormat.load(ProcedureWALFormat.java:82)
> at
> org.apache.hadoop.hbase.procedure2.store.wal.WALProcedureStore.load(WALProcedureStore.java:298)
> at
> org.apache.hadoop.hbase.procedure2.ProcedureExecutor.load(ProcedureExecutor.java:275)
> at
> org.apache.hadoop.hbase.procedure2.ProcedureExecutor.start(ProcedureExecutor.java:434)
> at
> org.apache.hadoop.hbase.master.HMaster.startProcedureExecutor(HMaster.java:1208)
> at
> org.apache.hadoop.hbase.master.HMaster.startServiceThreads(HMaster.java:1107)
> at
> org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:694)
> at org.apache.hadoop.hbase.master.HMaster.access$500(HMaster.java:186)
> at org.apache.hadoop.hbase.master.HMaster$1.run(HMaster.java:1713)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.ClassNotFoundException:
> org.apache.hadoop.hbase.master.procedure.ServerCrashProcedure
> at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:191)
> at
> org.apache.hadoop.hbase.procedure2.Procedure.newInstance(Procedure.java:536)
> ... 12 more
> {code}
> The cause was that ServerCrashProcedure, written in some WAL file under
> MasterProcWALs from first run, was absent in 1.1 release.
> After a brief discussion with Stephen, I am logging this JIRA to solicit
> discussion on how customer experience can be improved if downgrade of hbase
> is performed.
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