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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2018/03/21 06:49:00 UTC

[jira] [Updated] (HBASE-20237) Put back getClosestRowBefore and throw UnknownProtocolException instead... for asynchbase client

     [ https://issues.apache.org/jira/browse/HBASE-20237?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack updated HBASE-20237:
--------------------------
    Release Note: 
Throw UnknownProtocolException if a client connects and tries to invoke the old getClosestRowOrBefore method. Pre-hbase-1.0.0 or asynchbase do this instead of using its replacement, the reverse Scan.

getClosestRowOrBefore was implemented as a flag on Get. Before this patch though the flag was set, hbase2 were ignoring it. This made it look like a pre-1.0.0 client was 'working' but then it'd fail finding the appropriate Region for a client-specified row doing lookups into hbase:meta.
         Summary: Put back getClosestRowBefore and throw UnknownProtocolException instead... for asynchbase client  (was: Put back getClosestRowBefore and throw UnsupportedOperation instead... for asynchbase client)

> Put back getClosestRowBefore and throw UnknownProtocolException instead... for asynchbase client
> ------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-20237
>                 URL: https://issues.apache.org/jira/browse/HBASE-20237
>             Project: HBase
>          Issue Type: Bug
>          Components: compatibility, Operability
>            Reporter: stack
>            Assignee: stack
>            Priority: Major
>             Fix For: 2.0.0
>
>         Attachments: HBASE-20237.branch-2.001.patch
>
>
> asychbase can work against all hbase versions. This fact has saved us a few times; e.g. LINE were able to migrate from 0.94 to 1.2 going in part via asynchbase and its ability to work against all servers.
> hbase2 breaks this ability of asynchbase. There is nothing for asynchbase to figure definitively that it is talking to an hbase2 server (See HBASE-20225). Lets add back something it can leverage.  HBASE-13954 did a nice job purging getClosestRowBefore. Lets put back an RPC stuff that throws an exception if it gets called. Thats enough for asynchbase.



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