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https://issues.apache.org/jira/browse/HBASE-30529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18143529#comment-18143529
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Hudson commented on HBASE-30529:
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Results for branch branch-2
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> Throttle the region reopen when a replication peer becomes serial
> -----------------------------------------------------------------
>
> Key: HBASE-30529
> URL: https://issues.apache.org/jira/browse/HBASE-30529
> Project: HBase
> Issue Type: Bug
> Components: proc-v2, Replication
> Affects Versions: 2.6.0, 3.0.0-beta-1, 2.6.5
> Reporter: Sid Khillon
> Assignee: Sid Khillon
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0-alpha-1, 2.7.0, 3.1.0, 3.0.1, 2.6.8
>
>
> When a replication peer is changed from non-serial to serial,
> ModifyPeerProcedure.reopenRegions reopens every region of the peer's tables
> with {{{}new ReopenTableRegionsProcedure(tn){}}}. That constructor turns off
> batching, so {{hbase.reopen.table.regions.progressive.batch.size.max}} and
> {{hbase.reopen.table.regions.progressive.batch.backoff.ms}} are ignored and
> every region of the table closes and reopens at the same time.
> The same happens when a serial peer is added for tables that already have
> global replication scope.
> Table alters (ModifyTableProcedure) and HMaster#reopenRegionsThrottled
> already use {{{}ReopenTableRegionsProcedure.throttled(conf, td){}}}.
> HBASE-29809 moved HMaster#reopenRegions and RegionsRecoveryChore to the
> throttled path and mentioned replication procedures, but did not change
> ModifyPeerProcedure.
> *Example*
> A table with 932 regions, batch size max 50 and backoff 1000ms:
> * An alter reopens it in 24 batches (1, 2, 4, 8, 16, 32, then 50 at a time).
> * Making its replication peer serial reopens all 932 regions in one batch.
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