[jira] [Commented] (HBASE-3918) When assigning regions to an address, check the regionserver is actually online first

["stack (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-3918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13038662#comment-13038662 ] 

stack commented on HBASE-3918:
------------------------------

So, the above is .META. but then once we get past this if retain assignments is set, we'll run into the same issue with all user-space regions as we try to connect to their old locations.  Should check that the referenced regionserver is actually a member of the online set before we resasign.

> 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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