[jira] [Updated] (HBASE-26797) HBase 1.x clients will choke on rep_barrier rows when scanning hbase 2.x meta

["Duo Zhang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-26797?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Duo Zhang updated HBASE-26797:
------------------------------
    Fix Version/s:     (was: 1.8.0)

> HBase 1.x clients will choke on rep_barrier rows when scanning hbase 2.x meta
> -----------------------------------------------------------------------------
>
>                 Key: HBASE-26797
>                 URL: https://issues.apache.org/jira/browse/HBASE-26797
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.7.1
>            Reporter: Bryan Beaudreault
>            Assignee: Bryan Beaudreault
>            Priority: Major
>              Labels: patch-available
>             Fix For: 1.7.2
>
>
> In hbase 2.x, support for serial replication included adding a new CF to meta called rep_barrier. When regions are split or merged, these rep_barrier rows will not be cleaned up. Instead there's a ReplicationBarrierCleaner chore which runs every 12 hours. HBase 2.x clients will ignore these rep_barrier rows, per the [addFamily call in locateRegionInMeta|[https://github.com/apache/hbase/blob/branch-2/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionImplementation.java#L929].]
> Encountering these orphan rep_barrier rows causes the hbase 1.x client to fail when it [tries to extract the region location from the meta row|[https://github.com/apache/hbase/blob/branch-1/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionManager.java#L1340-L1344].] This is a non-recoverable exception, so retries will fail and it will eventually bubble up.
> The immediate fix when encountering this is to run {{{}hbck2 fixMeta{}}}, but we should fix the hbase 1.x client to similarly filter on the CATALOG_FAMILY to avoid these issues altogether.



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