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https://issues.apache.org/jira/browse/CASSANDRA-3546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13160851#comment-13160851
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Fredrik L Stigbäck commented on CASSANDRA-3546:
-----------------------------------------------
The patch is broken, hintStore must be declared outside the try {} finally {}
clause.
> Hinted handoffs isn't delivered if/when HintedHandOffManager ends up in
> invalid state.
> --------------------------------------------------------------------------------------
>
> Key: CASSANDRA-3546
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3546
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.3
> Reporter: Fredrik L Stigbäck
> Assignee: Sylvain Lebresne
> Fix For: 1.0.6
>
> Attachments: 3546.patch
>
>
> Running Cassandra 1.0.3.
> I've done some testing with 2 nodes (node A, node B), replication factor 2.
> I take node A down, writing some data to node B and then take node A up.
> Sometimes hints aren't delivered when node A comes up.
> I've done some debugging in org.apache.cassandra.db.HintedHandOffManager and
> sometimes node B ends up in a strange state in method
> org.apache.cassandra.db.HintedHandOffManager.deliverHints(final InetAddress
> to), where org.apache.cassandra.db.HintedHandOffManager.queuedDeliveries
> already has node A in it's Set and therefore no hints will ever be delivered
> to node A.
> The only reason for this that I can see is that in
> org.apache.cassandra.db.HintedHandOffManager.deliverHintsToEndpoint(InetAddress
> endpoint) the hintStore.isEmpty() check returns true and the endpoint (node
> A) isn't removed from
> org.apache.cassandra.db.HintedHandOffManager.queuedDeliveries. Then no hints
> will ever be delivered again until node B is restarted.
> During what conditions will hintStore.isEmpty() return true?
> Shouldn't the hintStore.isEmpty() check be inside the try {} finally{}
> clause, removing the endpoint from queuedDeliveries in the finally block?
> {code}
> public void deliverHints(final InetAddress to)
> {
> logger_.debug("deliverHints to {}", to);
> if (!queuedDeliveries.add(to))
> return;
> .......
> }
> {code}
> {code}
> private void deliverHintsToEndpoint(InetAddress endpoint)
> throws IOException, DigestMismatchException, InvalidRequestException,
> TimeoutException, InterruptedException
> {
> ColumnFamilyStore hintStore =
> Table.open(Table.SYSTEM_TABLE).getColumnFamilyStore(HINTS_CF);
> if (hintStore.isEmpty())
> return; // nothing to do, don't confuse users by logging a no-op
> handoff
> try
> {
> ......
> }
> finally
> {
> queuedDeliveries.remove(endpoint);
> }
> }
> {code}
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