Martin Weindel created CASSANDRA-6989:
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Summary: TombstoneOverwhelmingException after inserting 1000 rows
with many null values
Key: CASSANDRA-6989
URL: https://issues.apache.org/jira/browse/CASSANDRA-6989
Project: Cassandra
Issue Type: Bug
Components: Core
Environment: Cassandra 2.0.6, DataStax Java Driver 2.0.0
Reporter: Martin Weindel
Attachments: Main.java
See/use the attached Java class to reproduce the problem.
A table with 200 columns is created. For insertion a prepared statement is used
which fills nearly all columns with null values.
After inserting 1000 rows (no update), a "select count(*)" fails with a
TombstoneOverwhelmingException on server side.
If the prepared statement contains only the non-null columns, all works fine.
For me it looks, as if inserting a column cell with null value creates a
tombstone (but I don't know the internals of Cassandra). If you insert e.g.
10000 rows with 11 columns with are null, you already hit the default
tombstone_failure_threshold.
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