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Date: Thu, 18 May 2017 16:01:04 +0000 (UTC)
From: "Aleksandr Batenev (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
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Subject: [jira] [Commented] (CASSANDRA-13482) NPE on non-existing row read
 when row cache is enabled
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    [ https://issues.apache.org/jira/browse/CASSANDRA-13482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16015990#comment-16015990 ] 

Aleksandr Batenev commented on CASSANDRA-13482:
-----------------------------------------------

I have same error on cassandra 3.10:

query fail with row_cache on, and fine with cache off.
consistency level doesn't matter - one/quorum/all -> same result.
switch cache off and when on and/or restart cassandra doesn't fix problem.


java.lang.AssertionError: null
        at org.apache.cassandra.db.rows.UnfilteredRowIterators.concat(UnfilteredRowIterators.java:210) ~[apache-cassandra-3.10.jar:3.10]
        at org.apache.cassandra.db.SinglePartitionReadCommand.getThroughCache(SinglePartitionReadCommand.java:474) ~[apache-cassandra-3.10.jar:3.10]
        at org.apache.cassandra.db.SinglePartitionReadCommand.queryStorage(SinglePartitionReadCommand.java:374) ~[apache-cassandra-3.10.jar:3.10]
        at org.apache.cassandra.db.ReadCommand.executeLocally(ReadCommand.java:407) ~[apache-cassandra-3.10.jar:3.10]
        at org.apache.cassandra.db.ReadCommandVerbHandler.doVerb(ReadCommandVerbHandler.java:48) ~[apache-cassandra-3.10.jar:3.10]
        at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:66) ~[apache-cassandra-3.10.jar:3.10]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_131]
        at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:162) ~[apache-cassandra-3.10.jar:3.10]
        at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$LocalSessionFutureTask.run(AbstractLocalAwareExecutorService.java:134) [apache-cassandra-3.10.jar:3.10]
        at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:109) [apache-cassandra-3.10.jar:3.10]
        at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]


---

cassandra@cqlsh:sb> select * from session where agent_id = 846bed6c-978c-4cdb-958a-6a6155e9cdb5;
ReadFailure: Error from server: code=1300 [Replica(s) failed to execute read] message="Operation failed - received 0 responses and 2 failures" info={'failures': 2, 'received_responses': 0, 'required_responses': 2, 'consistency': 'QUORUM'}

cassandra@cqlsh:sb> ALTER TABLE  session WITH caching = {'keys': 'ALL'};
cassandra@cqlsh:sb> select * from session where agent_id = 846bed6c-978c-4cdb-958a-6a6155e9cdb5;

 agent_id | session_id | all_isps | all_locations | all_logins | last_ip | last_login | last_page | last_time | legacy_id
----------+------------+----------+---------------+------------+---------+------------+-----------+-----------+-----------

(0 rows)

cassandra@cqlsh:sb> ALTER TABLE  session WITH compaction = {'class': 'LeveledCompactionStrategy'} and caching = {'keys': 'ALL','rows_per_partition': 1};
cassandra@cqlsh:sb> select * from session where agent_id = 846bed6c-978c-4cdb-958a-6a6155e9cdb5;
ReadFailure: Error from server: code=1300 [Replica(s) failed to execute read] message="Operation failed - received 0 responses and 2 failures" info={'failures': 2, 'received_responses': 0, 'required_responses': 2, 'consistency': 'QUORUM'}

---

if i do select with another agent_id - all work fine! only one key fail...

> NPE on non-existing row read when row cache is enabled
> ------------------------------------------------------
>
>                 Key: CASSANDRA-13482
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13482
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Alex Petrov
>            Assignee: Alex Petrov
>
> The problem is reproducible on 3.0 with:
> {code}
> -# 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
> {code}
> Table setup:
> {code}
> CREATE TABLE cache_tables (pk int, v1 int, v2 int, v3 int, primary key (pk, v1)) WITH CACHING = { 'keys': 'ALL', 'rows_per_partition': '1' } ;
> {code}
> No data is required, only a head query (or any pk/ck query but with full partitions cached). 
> {code}
> select * from cross_page_queries where pk = 10000 ;
> {code}
> {code}
> 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]
> {code}


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