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https://issues.apache.org/jira/browse/HBASE-26797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17500932#comment-17500932
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Bryan Beaudreault commented on HBASE-26797:
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I've submitted a PR with a fix. I was unable to come up with a suitable test,
given the lack of ability to alter the meta table even in tests. I'm going to
get this deployed out to our internal users and run it against an hbase2
cluster we have.
> 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
>
> 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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