[jira] [Assigned] (HBASE-14783) Proc-V2: Master aborts when downgrading from 1.3 to 1.1

["Stephen Yuan Jiang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-14783?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stephen Yuan Jiang reassigned HBASE-14783:
------------------------------------------

    Assignee: Stephen Yuan Jiang

> 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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