Vincent White created CASSANDRA-14365:
-----------------------------------------
Summary: Commit log replay failure for static columns with
collections in clustering keys
Key: CASSANDRA-14365
URL: https://issues.apache.org/jira/browse/CASSANDRA-14365
Project: Cassandra
Issue Type: Bug
Components: Core
Reporter: Vincent White
In the old storage engine, static cells with a collection as part of the
clustering key fail to validate because a 0 byte collection (like in the cell
name of a static cell) isn't valid.
To reproduce:
1.
{code:java}
CREATE TABLE test.x (
id int,
id2 frozen<map<text, text>>,
st int static,
PRIMARY KEY (id, id2)
);
INSERT INTO test.x (id, st) VALUES (1, 2);
{code}
2.
Kill the cassandra process
3.
Restart cassandra to replay the commitlog
Outcome:
{noformat}
ERROR [main] 2018-04-05 04:58:23,741 JVMStabilityInspector.java:99 - Exiting
due to error while processing commit log during initialization.
org.apache.cassandra.db.commitlog.CommitLogReplayer$CommitLogReplayException:
Unexpected error deserializing mutation; saved to
/tmp/mutation3825739904516830950dat. This may be caused by replaying a
mutation against a table with the same name but incompatible schema. Exception
follows: org.apache.cassandra.serializers.MarshalException: Not enough bytes to
read a set
at
org.apache.cassandra.db.commitlog.CommitLogReplayer.handleReplayError(CommitLogReplayer.java:638)
[main/:na]
at
org.apache.cassandra.db.commitlog.CommitLogReplayer.replayMutation(CommitLogReplayer.java:565)
[main/:na]
at
org.apache.cassandra.db.commitlog.CommitLogReplayer.replaySyncSection(CommitLogReplayer.java:517)
[main/:na]
at
org.apache.cassandra.db.commitlog.CommitLogReplayer.recover(CommitLogReplayer.java:397)
[main/:na]
at
org.apache.cassandra.db.commitlog.CommitLogReplayer.recover(CommitLogReplayer.java:143)
[main/:na]
at
org.apache.cassandra.db.commitlog.CommitLog.recover(CommitLog.java:181)
[main/:na]
at
org.apache.cassandra.db.commitlog.CommitLog.recover(CommitLog.java:161)
[main/:na]
at
org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:284)
[main/:na]
at
org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:533)
[main/:na]
at
org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:642)
[main/:na]
{noformat}
I haven't investigated if there are other more subtle issues caused by these
cells failing to validate other places in the code, but I believe the fix for
this is to check for 0 byte length collections and accept them as valid as we
do with other types.
I haven't had a chance for any extensive testing but this naive patch seems to
have the desired affect. [2.2 PoC
Patch|https://github.com/vincewhite/cassandra/commits/zero_length_collection]
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