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https://issues.apache.org/jira/browse/CASSANDRA-3681?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis resolved CASSANDRA-3681.
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Resolution: Fixed
committed
> Multiple threads can attempt hint handoff to the same target
> ------------------------------------------------------------
>
> Key: CASSANDRA-3681
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3681
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.0
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Priority: Minor
> Labels: hintedhandoff
> Fix For: 1.0.7
>
> Attachments: 3681-v3.txt, 3681.txt, 3681v2.txt
>
>
> HintedHandOffManager attempts to prevent multiple threads sending hints to
> the same target with the queuedDeliveries set, but the code is buggy. If two
> handoffs *do* occur concurrently, the second thread can use an arbitrarily
> large amount of memory skipping tombstones when it starts paging from the
> beginning of the hint row, looking for the first live hint. (This is not a
> problem with a single thread, since it always pages starting with the
> last-seen hint column name, effectively skipping the tombstones. Then it
> compacts when it's done.)
> Technically this bug is present in all older Cassandra releases, but it only
> causes problems in 1.0.x since the hint rows tend to be much larger (since
> there is one hint per write containing the entire mutation, instead of just
> one per row consisting of just the key).
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