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https://issues.apache.org/jira/browse/CASSANDRA-17787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17573761#comment-17573761
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Aleksey Yeschenko commented on CASSANDRA-17787:
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We should really not be doing it simultaneously for every table, but have it
run on N tables at a time to completion. The alternative in these cases would
be to reduce merkle tree depths to accommodate more simultaneous trees, but
that would cause over-streaming.
> Full repair on a keyspace with a large amount of tables causes OOM
> ------------------------------------------------------------------
>
> Key: CASSANDRA-17787
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17787
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Repair
> Reporter: Brandon Williams
> Priority: Normal
> Fix For: 4.0.x, 4.1.x
>
>
> Running a nodetool repair -pr --full on a keyspace with a few hundred tables
> will cause a direct memory OOM, or lots of heap pressure with
> use_offheap_merkle_trees: false. Adjusting repair_session_space_in_mb does
> not seem to help. From an initial look at a heap dump, it appears to node is
> holding many _remote_ trees in memory.
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