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https://issues.apache.org/jira/browse/HBASE-26797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17717999#comment-17717999
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Viraj Jasani edited comment on HBASE-26797 at 4/30/23 1:10 AM:
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[~bbeaudreault] we also came across this issue, thank you again for this fix!!
:)
Do you recall any other similar fixes done in branch-1 specifically for the
similar 1.x client <-> 2.x server compatibility?
Mostly our 2.x codebase is quite up-to-date with latest branch-2.4 however due
to EOL, we might have missed some imp patches from branch-1, and this Jira is
definitely imp one.
was (Author: vjasani):
[~bbeaudreault] we also came across this issue, thank you again for this fix!!
:)
Do you recall any other similar fixes done in branch-1 specifically for the
similar 1.x client <-> 2.x server compatibility?
> 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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