[CASSANDRA-7946] NPE when streaming data to a joining node and dropping table in cluster

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 2.0.11, 2.1.1
• Component/s: Legacy/Streaming and Messaging
• Labels: streaming

Environment

Cassandra 2.0.9

• Severity: Normal
• Since Version: 2.0.9
• Assignee: Yuki Morishita
• Reporter: DuyHai Doan

Authors

Yuki Morishita

Reviewers

Marcus Eriksson

• Created: 16/Sep/14 18:34
• Updated: 16/Apr/19 09:31
• Resolved: 19/Sep/14 22:16

Description

Summary

The cluster has 3 nodes with Vnodes. We were adding a 4th one (in auto bootstrap mode). The 4 node has stream sessions, receiving data from the others.

While the streaming was going on (it takes quite a while because there are 200Gb of data of worth), an existing table is dropped in the cluster and a new one is created.

A few time after, we caught an NPE in the log file of the joining node (still not finished joining):

The NPE is located here: https://github.com/apache/cassandra/blob/cassandra-2.0/src/java/org/apache/cassandra/streaming/compress/CompressedStreamReader.java#L63

It can be a race condition where schema agreement has not reached the joining node.