[CASSANDRA-13482] NPE on non-existing row read when row cache is enabled

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 3.0.15, 3.11.1, 4.0-alpha1, 4.0
• Severity: Normal
• Assignee: Alex Petrov
• Reporter: Alex Petrov

Authors

Alex Petrov

Reviewers

Sylvain Lebresne

• Created: 28/Apr/17 10:52
• Updated: 15/May/20 08:04
• Resolved: 12/Jul/17 13:55

Description

The problem is reproducible on 3.0 with:

-# row_cache_class_name: org.apache.cassandra.cache.OHCProvider
+row_cache_class_name: org.apache.cassandra.cache.OHCProvider

-row_cache_size_in_mb: 0
+row_cache_size_in_mb: 100

Table setup:

CREATE TABLE cache_tables (pk int, v1 int, v2 int, v3 int, primary key (pk, v1)) WITH CACHING = { 'keys': 'ALL', 'rows_per_partition': '1' } ;

No data is required, only a head query (or any pk/ck query but with full partitions cached).

select * from cross_page_queries where pk = 10000 ;

java.lang.AssertionError: null
        at org.apache.cassandra.db.rows.UnfilteredRowIterators.concat(UnfilteredRowIterators.java:193) ~[main/:na]
        at org.apache.cassandra.db.SinglePartitionReadCommand.getThroughCache(SinglePartitionReadCommand.java:461) ~[main/:na]
        at org.apache.cassandra.db.SinglePartitionReadCommand.queryStorage(SinglePartitionReadCommand.java:358) ~[main/:na]
        at org.apache.cassandra.db.ReadCommand.executeLocally(ReadCommand.java:395) ~[main/:na]
        at org.apache.cassandra.service.StorageProxy$LocalReadRunnable.runMayThrow(StorageProxy.java:1794) ~[main/:na]
        at org.apache.cassandra.service.StorageProxy$DroppableRunnable.run(StorageProxy.java:2472) ~[main/:na]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_121]
        at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:164) ~[main/:na]
        at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$LocalSessionFutureTask.run(AbstractLocalAwareExecutorService.java:136) [main/:na]
        at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105) [main/:na]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_121]