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https://issues.apache.org/jira/browse/CASSANDRA-12707?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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nicolas ginder updated CASSANDRA-12707:
---------------------------------------
Fix Version/s: 2.2.x
2.1.x
> JVM out of memory when querying an extra-large partition with lots of
> tombstones
> --------------------------------------------------------------------------------
>
> Key: CASSANDRA-12707
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12707
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: nicolas ginder
> Fix For: 2.1.x, 2.2.x
>
>
> We have an extra large partition of 40 million cells where most of the cells
> were deleted. When querying this partition, Cassandra runs out of memory as
> tombstones fill up the JVM heap. After debugging one of the large SSTable we
> found that this part of the code loads all the tombstones.
> In org.apache.cassandra.db.filter.QueryFilter
> ...
> public static Iterator<Cell> gatherTombstones(final ColumnFamily returnCF,
> final Iterator<? extends OnDiskAtom> iter)
> {
> ...
> while (iter.hasNext())
> {
> OnDiskAtom atom = iter.next();
> if (atom instanceof Cell)
> {
> next = (Cell)atom;
> break;
> }
> else
> {
> if(returnCF.deletionInfo().rangeCount() >
> DatabaseDescriptor.getTombstoneFailureThreshold()){
> throw new TombstoneOverwhelmingException();
> }
> returnCF.addAtom(atom);
> }
> }
> ...
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