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https://issues.apache.org/jira/browse/HBASE-1858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12909058#action_12909058
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James Kennedy commented on HBASE-1858:
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Well the THLog.class does overwrite the read/write serialization methods to add
it's own fields. So if you've already serialized HLogs you may run into trouble.
I can say for sure though what will happen without digging further.
I suggest you try without conversion and see what happens.
Backup your data first though.
> Master can't split logs created by THBase
> -----------------------------------------
>
> Key: HBASE-1858
> URL: https://issues.apache.org/jira/browse/HBASE-1858
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.20.0
> Reporter: Clint Morgan
> Assignee: Clint Morgan
> Fix For: 0.20.1, 0.90.0
>
> Attachments: 1858-v2.patch, 1858.patch
>
>
> When master tries to split logs created by THbase, it fails because it tries
> to read in the wrong key type. (THBase subclasses HLogKey to add fields to
> the key).
> 2009-09-16 09:03:01,943 WARN org.apache.hadoop.hbase.regionserver.HLog:
> Exception processing
> hdfs://domU-12-31-39-07-CC-A2.compute-1.internal:9000/hbase/.logs/domU-12-31-39-07-CC-A2.compute-1.internal,60020,1253103101743/hlog.dat.1253103102168
> -- continuing. Possible DATA LOSS!
> java.io.IOException: wrong key class:
> org.apache.hadoop.hbase.regionserver.HLogKey is not class
> org.apache.hadoop.hbase.regionserver.transactional.THLogKey
> at
> org.apache.hadoop.io.SequenceFile$Reader.next(SequenceFile.java:1824)
> at
> org.apache.hadoop.io.SequenceFile$Reader.next(SequenceFile.java:1876)
> at org.apache.hadoop.hbase.regionserver.HLog.splitLog(HLog.java:880)
> at org.apache.hadoop.hbase.regionserver.HLog.splitLog(HLog.java:802)
> at
> org.apache.hadoop.hbase.master.ProcessServerShutdown.process(ProcessServerShutdown.java:274)
> at
> org.apache.hadoop.hbase.master.HMaster.processToDoQueue(HMaster.java:492)
> at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:426)
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