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Date: Tue, 12 Sep 2017 09:23:00 +0000 (UTC)
From: "ZhaoYang (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Message-ID: <JIRA.13079423.1497345632000.89113.1505208180189@Atlassian.JIRA>
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Subject: [jira] [Commented] (CASSANDRA-13595) Short read protection doesn't
 work at the end of a partition
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archived-at: Tue, 12 Sep 2017 09:23:05 -0000


    [ https://issues.apache.org/jira/browse/CASSANDRA-13595?page=3Dcom.atla=
ssian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=
=3D16162720#comment-16162720 ]=20

ZhaoYang commented on CASSANDRA-13595:
--------------------------------------

The cause is no short-read-protection generated for node2 with key=3D2, bec=
ause no UnfilteredRowIterator with key=3D2 for node2...

{code}
For initial read:
Node1 returns: =20
           PartitionIterator {
                UnfilteredIterator( k=3D1@tombstone, back by short-read-pro=
tection) =20
                UnfilteredIterator( k=3D2, back by short-read-protection) =
=20
          }
Node2 returns:=20
           PartitionIterator {
                UnfilteredIterator( k=3D1, back by short-read-protection)=
=20
          }
{code}

I think in this case, we should expect paging to fetch next partition inste=
ad of short-read-protection which seems work only within partition, not acr=
oss partition.

> Short read protection doesn't work at the end of a partition
> ------------------------------------------------------------
>
>                 Key: CASSANDRA-13595
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1359=
5
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Coordination
>            Reporter: Andr=C3=A9s de la Pe=C3=B1a
>            Assignee: ZhaoYang
>
> It seems that short read protection doesn't work when the short read is d=
one at the end of a partition in a range query. The final assertion of this=
 dtest fails:
> {code}
> def short_read_partitions_delete_test(self):
>         cluster =3D self.cluster
>         cluster.set_configuration_options(values=3D{'hinted_handoff_enabl=
ed': False})
>         cluster.set_batch_commitlog(enabled=3DTrue)
>         cluster.populate(2).start(wait_other_notice=3DTrue)
>         node1, node2 =3D self.cluster.nodelist()
>         session =3D self.patient_cql_connection(node1)
>         create_ks(session, 'ks', 2)
>         session.execute("CREATE TABLE t (k int, c int, PRIMARY KEY(k, c))=
 WITH read_repair_chance =3D 0.0")
>         # we write 1 and 2 in a partition: all nodes get it.
>         session.execute(SimpleStatement("INSERT INTO t (k, c) VALUES (1, =
1)", consistency_level=3DConsistencyLevel.ALL))
>         session.execute(SimpleStatement("INSERT INTO t (k, c) VALUES (2, =
1)", consistency_level=3DConsistencyLevel.ALL))
>         # we delete partition 1: only node 1 gets it.
>         node2.flush()
>         node2.stop(wait_other_notice=3DTrue)
>         session =3D self.patient_cql_connection(node1, 'ks', consistency_=
level=3DConsistencyLevel.ONE)
>         session.execute(SimpleStatement("DELETE FROM t WHERE k =3D 1"))
>         node2.start(wait_other_notice=3DTrue)
>         # we delete partition 2: only node 2 gets it.
>         node1.flush()
>         node1.stop(wait_other_notice=3DTrue)
>         session =3D self.patient_cql_connection(node2, 'ks', consistency_=
level=3DConsistencyLevel.ONE)
>         session.execute(SimpleStatement("DELETE FROM t WHERE k =3D 2"))
>         node1.start(wait_other_notice=3DTrue)
>         # read from both nodes
>         session =3D self.patient_cql_connection(node1, 'ks', consistency_=
level=3DConsistencyLevel.ALL)
>         assert_none(session, "SELECT * FROM t LIMIT 1")
> {code}
> However, the dtest passes if we remove the {{LIMIT 1}}.
> Short read protection [uses a {{SinglePartitionReadCommand}}|https://gith=
ub.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/service/Da=
taResolver.java#L484], maybe it should use a {{PartitionRangeReadCommand}} =
instead?


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