Jared Gray created CASSANDRA-9272:
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Summary: Atomic Batch Statements Fail to Execute on Some
Coordinators
Key: CASSANDRA-9272
URL: https://issues.apache.org/jira/browse/CASSANDRA-9272
Project: Cassandra
Issue Type: Bug
Components: Core
Environment: Operating System: Red Hat Enterprise Linux Server release
6.5 (Santiago)
Cassandra and CQL: [cqlsh 4.1.1 | Cassandra 2.0.14 | CQL spec 3.1.1 | Thrift
protocol 19.39.0]
JVM vendor/version: Java HotSpot(TM) 64-Bit Server VM/1.7.0_79 (Oracle Java)
Using PropertyFileSnitch to define cluster topology.
Reporter: Jared Gray
Install and configure a three-node Cassandra cluster spread across two data
centers (DCs). Place two Cassandra instances in DC1 and one Cassandra instance
in DC2. (We have designated one node as a seed in each data center.)
Gracefully shut down any one Cassandra instance in DC1. This can be done by
running 'kill <process_id>' in Linux.
Open a CQL Shell connection to the remaining node in DC1.
Create the following keyspace: CREATE KEYSPACE batch_test WITH replication =
{'class': 'NetworkTopologyStrategy', 'DC1': '2', 'DC2':'1'};
Create the following table: CREATE TABLE batch_test.batch_table ( partition_key
TEXT PRIMARY KEY );
Execute the following atomic batch query: BEGIN BATCH INSERT INTO
batch_test.batch_table (partition_key) VALUES ('a'); INSERT INTO
batch_test.batch_table (partition_key) VALUES ('b'); APPLY BATCH;
Observe an availability-related error, despite a sufficient number of nodes
available to service the query. The trace below shows sample results from our
cluster:
DC1
----
cqlsh> CONSISTENCY
Current consistency level is ONE.
cqlsh> BEGIN BATCH INSERT INTO batch_test.batch_table (partition_key) VALUES
('a'); INSERT INTO batch_test.batch_table (partition_key) VALUES ('b'); APPLY
BATCH;
Unable to complete request: one or more nodes were unavailable.
cqlsh> CONSISTENCY QUORUM
Consistency level set to QUORUM.
cqlsh> BEGIN BATCH INSERT INTO batch_test.batch_table (partition_key) VALUES
('a'); INSERT INTO batch_test.batch_table (partition_key) VALUES ('b'); APPLY
BATCH;
Unable to complete request: one or more nodes were unavailable.
cqlsh> BEGIN UNLOGGED BATCH INSERT INTO batch_test.batch_table (partition_key)
VALUES ('a'); INSERT INTO batch_test.batch_table (partition_key) VALUES ('b');
APPLY BATCH;
cqlsh>
Note: an UNLOGGED BATCH executes successfully. A regular BATCH also executes
successfully if it only contains one INSERT query.
We now show a similar trace using a CQL Shell connected to the Cassandra
instance in DC2:
DC2
---
cqlsh> CONSISTENCY
Current consistency level is ONE.
cqlsh> BEGIN BATCH INSERT INTO batch_test.batch_table (partition_key) VALUES
('a'); INSERT INTO batch_test.batch_table (partition_key) VALUES ('b'); APPLY
BATCH;
cqlsh> CONSISTENCY QUORUM
Consistency level set to QUORUM.
cqlsh> BEGIN BATCH INSERT INTO batch_test.batch_table (partition_key) VALUES
('a'); INSERT INTO batch_test.batch_table (partition_key) VALUES ('b'); APPLY
BATCH;
cqlsh> BEGIN UNLOGGED BATCH INSERT INTO batch_test.batch_table (partition_key)
VALUES ('a'); INSERT INTO batch_test.batch_table (partition_key) VALUES ('b');
APPLY BATCH;
cqlsh>
All queries execute successfully using the DC2 Cassandra instance as a
coordinator.
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