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https://issues.apache.org/jira/browse/HBASE-3918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13070110#comment-13070110
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stack commented on HBASE-3918:
------------------------------
bq. So my query is, is this defect applicable only between 0.89.x and 0.90.x
versions?
Yes, the servername format has changed between 0.91 and 0.90 and they will not
be able to communicate. I'm not this issue is specific to 0.89 and 0.90.
Regardless, I'd think that we should check that a server actually belongs to
our current cluster before we go to use it don't you think Ram?
> When assigning regions to an address, check the regionserver is actually
> online first
> -------------------------------------------------------------------------------------
>
> Key: HBASE-3918
> URL: https://issues.apache.org/jira/browse/HBASE-3918
> Project: HBase
> Issue Type: Bug
> Reporter: stack
>
> This one came up in the case where the data was copied from one cluster to
> another. The first cluster was running 0.89.x. The second 0.90.x. On
> startup of 0.90.x, it wanted to verify .META. was in the location -ROOT- said
> it was at, so it tried connect to the FIRST cluster. The attempt failed
> because of mismatched RPCs. The master then actually aborted.
> {code}
> org.apache.hadoop.hbase.ipc.HBaseRPC$VersionMismatch: Protocol
> org.apache.hadoop.hbase.ipc.HRegionInterface version mismatch. (client = 27,
> server = 24)
> at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:424)
> at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:393)
> at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:444)
> at org.apache.hadoop.hbase.ipc.HBaseRPC.waitForProxy(HBaseRPC.java:349)
> at
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getHRegionConnection(HConnectionManager.java:965)
> at
> org.apache.hadoop.hbase.catalog.CatalogTracker.getCachedConnection(CatalogTracker.java:386)
> at
> org.apache.hadoop.hbase.catalog.CatalogTracker.getMetaServerConnection(CatalogTracker.java:285)
> at
> org.apache.hadoop.hbase.catalog.CatalogTracker.verifyMetaRegionLocation(CatalogTracker.java:486)
> at org.apache.hadoop.hbase.master.HMaster.assignRootAndMeta(HMaster.java:442)
> at
> org.apache.hadoop.hbase.master.HMaster.finishInitialization(HMaster.java:389)
> at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:283)
> 2011-05-23 22:38:07,720 INFO org.apache.hadoop.hbase.master.HMaster: Aborting
> {code}
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