[
https://issues.apache.org/jira/browse/CASSANDRA-18728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ke Han updated CASSANDRA-18728:
-------------------------------
Description:
h1. Bug Description
When using Cassandra 3.11.16 to load legacy data from 2.2.10, I noticed that
the byte representation of the column identifier is incorrect.
The legacy data contain two tables, and the schema is as follows.
{code:java}
cqlsh> desc test.alpha ;
CREATE TABLE test.alpha (
key text PRIMARY KEY,
foo text
) WITH COMPACT STORAGE
AND bloom_filter_fp_chance = 0.01
AND caching = '{"keys":"ALL", "rows_per_partition":"NONE"}'
AND comment = ''
AND compaction = {'min_threshold': '4', 'class':
'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
'max_threshold': '32'}
AND compression = {'sstable_compression':
'org.apache.cassandra.io.compress.LZ4Compressor'}
AND dclocal_read_repair_chance = 0.1
AND default_time_to_live = 0
AND gc_grace_seconds = 864000
AND max_index_interval = 2048
AND memtable_flush_period_in_ms = 0
AND min_index_interval = 128
AND read_repair_chance = 0.0
AND speculative_retry = 'NONE';
cqlsh> DESC test.foos ;
CREATE TABLE test.foos (
key text PRIMARY KEY,
"666f6f" text
) WITH COMPACT STORAGE
AND bloom_filter_fp_chance = 0.01
AND caching = '{"keys":"ALL", "rows_per_partition":"NONE"}'
AND comment = ''
AND compaction = {'min_threshold': '4', 'class':
'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
'max_threshold': '32'}
AND compression = {'sstable_compression':
'org.apache.cassandra.io.compress.LZ4Compressor'}
AND dclocal_read_repair_chance = 0.1
AND default_time_to_live = 0
AND gc_grace_seconds = 864000
AND max_index_interval = 2048
AND memtable_flush_period_in_ms = 0
AND min_index_interval = 128
AND read_repair_chance = 0.0
AND speculative_retry = 'NONE';
CREATE INDEX idx_foo ON test.foos ("666f6f"); {code}
There exists a column in test.foo with {*}name = "666f6f"{*}, the corresponding
byte representation should be Hex(666f6f) == {*}363636663666{*}. However, when
3.11.15 loads the data and creating the column, if we check the value in
byteBuffer, the it still stores "666f6f".
{code:java}
// src/java/org/apache/cassandra/schema/SchemaKeyspace.java
public static ColumnDefinition createColumnFromRow(UntypedResultSet.Row row,
Types types)
{
String keyspace = row.getString("keyspace_name");
String table = row.getString("table_name");
ColumnDefinition.Kind kind =
ColumnDefinition.Kind.valueOf(row.getString("kind").toUpperCase());
int position = row.getInt("position");
ClusteringOrder order =
ClusteringOrder.valueOf(row.getString("clustering_order").toUpperCase());
AbstractType<?> type = parse(keyspace, row.getString("type"), types);
if (order == ClusteringOrder.DESC)
type = ReversedType.getInstance(type);
// Injected log to check byteBuffer value
logger.info(String.format("column_name = %s, column_name_bytes = %s" ,
row.getString("column_name"), new
String(row.getBytes("column_name_bytes").array(), StandardCharsets.UTF_8)));
ColumnIdentifier name = new
ColumnIdentifier(row.getBytes("column_name_bytes"),
row.getString("column_name"));
return new ColumnDefinition(keyspace, table, name, type, position, kind);
}{code}
h2. Logs
INFO [main] 2023-08-07 02:21:53,762 SchemaKeyspace.java:1136 -
*{color:#de350b}column_name = 666f6f, column_name_bytes = foo{color}*
It should be : +column_name_bytes = {color:#172b4d}666f6f{color}+
{code:java}
INFO [main] 2023-08-07 02:21:53,722 StorageService.java:773 - Populating token
metadata from system tables
INFO [main] 2023-08-07 02:21:53,736 StorageService.java:780 - Token metadata:
Normal Tokens:
localhost/127.0.0.1:[95610762103941981519101009083045058398]INFO [main]
2023-08-07 02:21:53,756 SchemaKeyspace.java:1136 - column_name = column1,
column_name_bytes = column1
INFO [main] 2023-08-07 02:21:53,756 SchemaKeyspace.java:1136 - column_name =
foo, column_name_bytes = foo
INFO [main] 2023-08-07 02:21:53,756 SchemaKeyspace.java:1136 - column_name =
key, column_name_bytes = key
INFO [main] 2023-08-07 02:21:53,756 SchemaKeyspace.java:1136 - column_name =
value, column_name_bytes = value
INFO [main] 2023-08-07 02:21:53,762 SchemaKeyspace.java:1136 - column_name =
666f6f, column_name_bytes = foo // Incorrect!
INFO [main] 2023-08-07 02:21:53,762 SchemaKeyspace.java:1136 - column_name =
column1, column_name_bytes = column1{code}
h1. Reproduce Method
h2. Method1: load attached data file
I have attached the data tar file, if start up Cassandra 3.11.16 with it and
inject a the log statement to print out the buffer value, we can notice that
the value is incorrect in the log.
h2. Method2: Generate the data from the old version
Start up Cassandra 2.1.19 version, using bin/cassandra-cli to construct the
following data
{code:java}
create keyspace test with strategy_options = {replication_factor:1} and
placement_strategy = 'org.apache.cassandra.locator.SimpleStrategy';
use test;
create column family alpha
with column_type = 'Standard'
and comparator = 'UTF8Type'
and key_validation_class = 'UTF8Type'
and column_metadata = [{column_name: 'foo', validation_class: 'UTF8Type'}];
create column family foos
with column_type = 'Standard'
and comparator = 'BytesType'
and key_validation_class = 'UTF8Type'
and column_metadata = [{column_name: '666f6f', validation_class: 'UTF8Type'}];
{code}
Then load the data using 3.0.16 with the log statements injected, and you will
encounter the logs mentioned above.
h1. Thoughts
This is a transient bug which won't lead to exceptions or error logs. But the
incorrect byte representation might lead to some issues.
This bug shares the same triggering method with CASSANDRA-14468. I believe this
bug also shares the same root cause as CASSANDRA-14468. In CASSANDRA-14468, the
incorrect byte representation could lead to an upgrade exception. It was
partially fixed by avoiding the intern of ColumnIdentifier (which makes this
bug transient). But the real root cause remains, and it's still possible to
cause other problems.
was:
h1. Bug Description
When using Cassandra 3.11.16 to load legacy data from 2.2.10, I noticed that
the byte representation of the column identifier is incorrect.
The legacy data contain two tables, and the schema is as follows.
{code:java}
cqlsh> desc test.alpha ;
CREATE TABLE test.alpha (
key text PRIMARY KEY,
foo text
) WITH COMPACT STORAGE
AND bloom_filter_fp_chance = 0.01
AND caching = '{"keys":"ALL", "rows_per_partition":"NONE"}'
AND comment = ''
AND compaction = {'min_threshold': '4', 'class':
'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
'max_threshold': '32'}
AND compression = {'sstable_compression':
'org.apache.cassandra.io.compress.LZ4Compressor'}
AND dclocal_read_repair_chance = 0.1
AND default_time_to_live = 0
AND gc_grace_seconds = 864000
AND max_index_interval = 2048
AND memtable_flush_period_in_ms = 0
AND min_index_interval = 128
AND read_repair_chance = 0.0
AND speculative_retry = 'NONE';
cqlsh> DESC test.foos ;
CREATE TABLE test.foos (
key text PRIMARY KEY,
"666f6f" text
) WITH COMPACT STORAGE
AND bloom_filter_fp_chance = 0.01
AND caching = '{"keys":"ALL", "rows_per_partition":"NONE"}'
AND comment = ''
AND compaction = {'min_threshold': '4', 'class':
'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
'max_threshold': '32'}
AND compression = {'sstable_compression':
'org.apache.cassandra.io.compress.LZ4Compressor'}
AND dclocal_read_repair_chance = 0.1
AND default_time_to_live = 0
AND gc_grace_seconds = 864000
AND max_index_interval = 2048
AND memtable_flush_period_in_ms = 0
AND min_index_interval = 128
AND read_repair_chance = 0.0
AND speculative_retry = 'NONE';
CREATE INDEX idx_foo ON test.foos ("666f6f"); {code}
There exists a column in test.foo with {*}name = "666f6f"{*}, the corresponding
byte representation should be Hex(666f6f) == {*}363636663666{*}. However, when
3.11.15 loads the data and creating the column, if we check the value in
byteBuffer, the it still stores "666f6f".
{code:java}
// src/java/org/apache/cassandra/schema/SchemaKeyspace.java
public static ColumnDefinition createColumnFromRow(UntypedResultSet.Row row,
Types types)
{
String keyspace = row.getString("keyspace_name");
String table = row.getString("table_name");
ColumnDefinition.Kind kind =
ColumnDefinition.Kind.valueOf(row.getString("kind").toUpperCase());
int position = row.getInt("position");
ClusteringOrder order =
ClusteringOrder.valueOf(row.getString("clustering_order").toUpperCase());
AbstractType<?> type = parse(keyspace, row.getString("type"), types);
if (order == ClusteringOrder.DESC)
type = ReversedType.getInstance(type);
// Injected log to check byteBuffer value
logger.info(String.format("column_name = %s, column_name_bytes = %s" ,
row.getString("column_name"), new
String(row.getBytes("column_name_bytes").array(), StandardCharsets.UTF_8)));
ColumnIdentifier name = new
ColumnIdentifier(row.getBytes("column_name_bytes"),
row.getString("column_name"));
return new ColumnDefinition(keyspace, table, name, type, position, kind);
}{code}
h2. Logs
INFO [main] 2023-08-07 02:21:53,762 SchemaKeyspace.java:1136 -
*{color:#de350b}column_name = 666f6f, column_name_bytes = foo{color}*
It should be : +column_name_bytes = {color:#172b4d}666f6f{color}+
{code:java}
INFO [main] 2023-08-07 02:21:53,722 StorageService.java:773 - Populating token
metadata from system tables
INFO [main] 2023-08-07 02:21:53,736 StorageService.java:780 - Token metadata:
Normal Tokens:
localhost/127.0.0.1:[95610762103941981519101009083045058398]INFO [main]
2023-08-07 02:21:53,756 SchemaKeyspace.java:1136 - column_name = column1,
column_name_bytes = column1
INFO [main] 2023-08-07 02:21:53,756 SchemaKeyspace.java:1136 - column_name =
foo, column_name_bytes = foo
INFO [main] 2023-08-07 02:21:53,756 SchemaKeyspace.java:1136 - column_name =
key, column_name_bytes = key
INFO [main] 2023-08-07 02:21:53,756 SchemaKeyspace.java:1136 - column_name =
value, column_name_bytes = value
INFO [main] 2023-08-07 02:21:53,762 SchemaKeyspace.java:1136 - column_name =
666f6f, column_name_bytes = foo // Incorrect!
INFO [main] 2023-08-07 02:21:53,762 SchemaKeyspace.java:1136 - column_name =
column1, column_name_bytes = column1{code}
h1. Reproduce Method
h2. Method1: load attached data file
I have attached the data tar file, if start up Cassandra 3.11.16 with it and
inject a the log statement to print out the buffer value, we can notice that
the value is incorrect in the log.
Method2: Generate the data file
h2. Method2: Generate the data from the old version
Start up Cassandra 2.1.19 version, using bin/cassandra-cli to construct the
following data
{code:java}
create keyspace test with strategy_options = {replication_factor:1} and
placement_strategy = 'org.apache.cassandra.locator.SimpleStrategy';
use test;
create column family alpha
with column_type = 'Standard'
and comparator = 'UTF8Type'
and key_validation_class = 'UTF8Type'
and column_metadata = [{column_name: 'foo', validation_class: 'UTF8Type'}];
create column family foos
with column_type = 'Standard'
and comparator = 'BytesType'
and key_validation_class = 'UTF8Type'
and column_metadata = [{column_name: '666f6f', validation_class: 'UTF8Type'}];
{code}
Then load the data using 3.0.16 with the log statements injected, and you will
encounter the logs mentioned above.
h1. Thoughts
This is a transient bug which won't lead to exceptions or error logs. But the
incorrect byte representation might lead to some issues.
This bug shares the same triggering method with CASSANDRA-14468. I believe this
bug also shares the same root cause as CASSANDRA-14468. In CASSANDRA-14468, the
incorrect byte representation could lead to an upgrade exception. It was
partially fixed by avoiding the intern of ColumnIdentifier (which makes this
bug transient). But the real root cause remains, and it's still possible to
cause other problems.
> [Transient Bug] Incorrect ByteBuffer representation of ColumnIdentifiers when
> 3.11.16 loading legacy data from 2.x
> ------------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-18728
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18728
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Coordination
> Reporter: Ke Han
> Priority: Normal
> Fix For: 3.11.x
>
> Attachments: data.tar.gz, system.log
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> h1. Bug Description
> When using Cassandra 3.11.16 to load legacy data from 2.2.10, I noticed that
> the byte representation of the column identifier is incorrect.
> The legacy data contain two tables, and the schema is as follows.
> {code:java}
> cqlsh> desc test.alpha ;
> CREATE TABLE test.alpha (
> key text PRIMARY KEY,
> foo text
> ) WITH COMPACT STORAGE
> AND bloom_filter_fp_chance = 0.01
> AND caching = '{"keys":"ALL", "rows_per_partition":"NONE"}'
> AND comment = ''
> AND compaction = {'min_threshold': '4', 'class':
> 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
> 'max_threshold': '32'}
> AND compression = {'sstable_compression':
> 'org.apache.cassandra.io.compress.LZ4Compressor'}
> AND dclocal_read_repair_chance = 0.1
> AND default_time_to_live = 0
> AND gc_grace_seconds = 864000
> AND max_index_interval = 2048
> AND memtable_flush_period_in_ms = 0
> AND min_index_interval = 128
> AND read_repair_chance = 0.0
> AND speculative_retry = 'NONE';
> cqlsh> DESC test.foos ;
> CREATE TABLE test.foos (
> key text PRIMARY KEY,
> "666f6f" text
> ) WITH COMPACT STORAGE
> AND bloom_filter_fp_chance = 0.01
> AND caching = '{"keys":"ALL", "rows_per_partition":"NONE"}'
> AND comment = ''
> AND compaction = {'min_threshold': '4', 'class':
> 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
> 'max_threshold': '32'}
> AND compression = {'sstable_compression':
> 'org.apache.cassandra.io.compress.LZ4Compressor'}
> AND dclocal_read_repair_chance = 0.1
> AND default_time_to_live = 0
> AND gc_grace_seconds = 864000
> AND max_index_interval = 2048
> AND memtable_flush_period_in_ms = 0
> AND min_index_interval = 128
> AND read_repair_chance = 0.0
> AND speculative_retry = 'NONE';
> CREATE INDEX idx_foo ON test.foos ("666f6f"); {code}
> There exists a column in test.foo with {*}name = "666f6f"{*}, the
> corresponding byte representation should be Hex(666f6f) ==
> {*}363636663666{*}. However, when 3.11.15 loads the data and creating the
> column, if we check the value in byteBuffer, the it still stores "666f6f".
> {code:java}
> // src/java/org/apache/cassandra/schema/SchemaKeyspace.java
> public static ColumnDefinition createColumnFromRow(UntypedResultSet.Row row,
> Types types)
> {
> String keyspace = row.getString("keyspace_name");
> String table = row.getString("table_name");
> ColumnDefinition.Kind kind =
> ColumnDefinition.Kind.valueOf(row.getString("kind").toUpperCase());
> int position = row.getInt("position");
> ClusteringOrder order =
> ClusteringOrder.valueOf(row.getString("clustering_order").toUpperCase());
> AbstractType<?> type = parse(keyspace, row.getString("type"), types);
> if (order == ClusteringOrder.DESC)
> type = ReversedType.getInstance(type);
> // Injected log to check byteBuffer value
> logger.info(String.format("column_name = %s, column_name_bytes = %s" ,
> row.getString("column_name"), new
> String(row.getBytes("column_name_bytes").array(), StandardCharsets.UTF_8)));
> ColumnIdentifier name = new
> ColumnIdentifier(row.getBytes("column_name_bytes"),
> row.getString("column_name"));
> return new ColumnDefinition(keyspace, table, name, type, position, kind);
> }{code}
> h2. Logs
> INFO [main] 2023-08-07 02:21:53,762 SchemaKeyspace.java:1136 -
> *{color:#de350b}column_name = 666f6f, column_name_bytes = foo{color}*
> It should be : +column_name_bytes = {color:#172b4d}666f6f{color}+
> {code:java}
> INFO [main] 2023-08-07 02:21:53,722 StorageService.java:773 - Populating
> token metadata from system tables
> INFO [main] 2023-08-07 02:21:53,736 StorageService.java:780 - Token
> metadata: Normal Tokens:
> localhost/127.0.0.1:[95610762103941981519101009083045058398]INFO [main]
> 2023-08-07 02:21:53,756 SchemaKeyspace.java:1136 - column_name = column1,
> column_name_bytes = column1
> INFO [main] 2023-08-07 02:21:53,756 SchemaKeyspace.java:1136 - column_name =
> foo, column_name_bytes = foo
> INFO [main] 2023-08-07 02:21:53,756 SchemaKeyspace.java:1136 - column_name =
> key, column_name_bytes = key
> INFO [main] 2023-08-07 02:21:53,756 SchemaKeyspace.java:1136 - column_name =
> value, column_name_bytes = value
> INFO [main] 2023-08-07 02:21:53,762 SchemaKeyspace.java:1136 - column_name =
> 666f6f, column_name_bytes = foo // Incorrect!
> INFO [main] 2023-08-07 02:21:53,762 SchemaKeyspace.java:1136 - column_name =
> column1, column_name_bytes = column1{code}
> h1. Reproduce Method
> h2. Method1: load attached data file
> I have attached the data tar file, if start up Cassandra 3.11.16 with it and
> inject a the log statement to print out the buffer value, we can notice that
> the value is incorrect in the log.
> h2. Method2: Generate the data from the old version
> Start up Cassandra 2.1.19 version, using bin/cassandra-cli to construct the
> following data
> {code:java}
> create keyspace test with strategy_options = {replication_factor:1} and
> placement_strategy = 'org.apache.cassandra.locator.SimpleStrategy';
> use test;
> create column family alpha
> with column_type = 'Standard'
> and comparator = 'UTF8Type'
> and key_validation_class = 'UTF8Type'
> and column_metadata = [{column_name: 'foo', validation_class: 'UTF8Type'}];
> create column family foos
> with column_type = 'Standard'
> and comparator = 'BytesType'
> and key_validation_class = 'UTF8Type'
> and column_metadata = [{column_name: '666f6f', validation_class: 'UTF8Type'}];
> {code}
> Then load the data using 3.0.16 with the log statements injected, and you
> will encounter the logs mentioned above.
> h1. Thoughts
> This is a transient bug which won't lead to exceptions or error logs. But the
> incorrect byte representation might lead to some issues.
> This bug shares the same triggering method with CASSANDRA-14468. I believe
> this bug also shares the same root cause as CASSANDRA-14468. In
> CASSANDRA-14468, the incorrect byte representation could lead to an upgrade
> exception. It was partially fixed by avoiding the intern of ColumnIdentifier
> (which makes this bug transient). But the real root cause remains, and it's
> still possible to cause other problems.
>
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