[HBASE-5795] HServerLoad$RegionLoad breaks 0.92<->0.94 compatibility

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.94.0, 0.95.0
• Hadoop Flags: Reviewed
• Assignee: Ted Yu
• Reporter: Michael Stack
• Created: 14/Apr/12 22:58
• Updated: 26/Feb/13 08:12
• Resolved: 16/Apr/12 21:45

Description

This commit broke our 0.92/0.94 compatibility:

------------------------------------------------------------------------
r1136686 | stack | 2011-06-16 14:18:08 -0700 (Thu, 16 Jun 2011) | 1 line

HBASE-3927 display total uncompressed byte size of a region in web UI

I just tried the new RC for 0.94. I brought up a 0.94 master on a 0.92 cluster and rather than just digest version 1 of the HServerLoad, I get this:

2012-04-14 22:47:59,752 WARN org.apache.hadoop.ipc.HBaseServer: Unable to read call parameters for client 10.4.14.38
java.io.IOException: Error in readFields
        at org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:684)
        at org.apache.hadoop.hbase.ipc.Invocation.readFields(Invocation.java:125)
        at org.apache.hadoop.hbase.ipc.HBaseServer$Connection.processData(HBaseServer.java:1269)
        at org.apache.hadoop.hbase.ipc.HBaseServer$Connection.readAndProcess(HBaseServer.java:1184)
        at org.apache.hadoop.hbase.ipc.HBaseServer$Listener.doRead(HBaseServer.java:722)
        at org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.doRunLoop(HBaseServer.java:513)
        at org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.run(HBaseServer.java:488)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
Caused by: A record version mismatch occured. Expecting v2, found v1
        at org.apache.hadoop.io.VersionedWritable.readFields(VersionedWritable.java:46)
        at org.apache.hadoop.hbase.HServerLoad$RegionLoad.readFields(HServerLoad.java:379)
        at org.apache.hadoop.hbase.HServerLoad.readFields(HServerLoad.java:686)
        at org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:681)
        ... 9 more