Brad Vernon created CASSANDRA-18560:
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Summary: Incorrect IP used for gossip across DCs with
prefer_local=true
Key: CASSANDRA-18560
URL: https://issues.apache.org/jira/browse/CASSANDRA-18560
Project: Cassandra
Issue Type: Bug
Reporter: Brad Vernon
After installing a new node using 4.0.10 we experienced a situation where the
new node attempted to connect to the private ip of a random number of nodes
remote DCs which are only accessible via public ip for cross dc communications.
The only impact was new nodes outbound connections, inbound from pre-4.0.10
were not affected. system.peers_v2 (below) showed that the preferred_ip and
preferred_port as null, only those in 4.0.10 nodes dc have perferred_ip values
as expected.
We believe the issue originated with
https://issues.apache.org/jira/browse/CASSANDRA-16718
Details on cluster:
* All nodes have public IP configured as well as private IP
* Listen/rpc addressrs are configured for private ip, broadcast is public IP
* prefer_local=true is enabled for all nodes
The log that showed the connection failing:
{code:java}
INFO [Messaging-EventLoop-3-8] 2023-06-01 00:14:21,565 NoSpamLogger.java:92 -
/99.81.<redacted>:7000->/44.208.<redacted>:7000-URGENT_MESSAGES-[no-channel]
failed to connectio.netty.channel.ConnectTimeoutException: connection timed
out: /10.26.5.11:7000 at
io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe$2.run(AbstractEpollChannel.java:576){code}
99 and 44 instances can only access each other using public ips.
gossipinfo output from 4.0.10 node
{code:java}
/44.208.<redacted>
generation:1661113358
heartbeat:25267691
LOAD:25267683:1.7882044268E10
SCHEMA:24692061:e98b918d-499f-3ccc-8dbe-5af31f685bda
DC:13:us-east-1
RACK:15:1a
RELEASE_VERSION:6:4.0.5
NET_VERSION:2:12
HOST_ID:3:9a41e668-060d-4cfe-bb1e-013f5116422d
RPC_READY:1407:true
INTERNAL_ADDRESS_AND_PORT:9:10.26.5.11:7000
NATIVE_ADDRESS_AND_PORT:4:44.208.<redacted>:9042
STATUS_WITH_PORT:1393:NORMAL,-2262036356854762881
SSTABLE_VERSIONS:7:big-nb
TOKENS:1392:<hidden> {code}
Peers output from 4.0.10 node:
{code:java}
peer | peer_port | data_center | host_id
| native_address | native_port | preferred_ip | preferred_port |
rack | release_version | schema_version |
tokens----------------+-----------+---------------------+--------------------------------------+----------------+-------------+--------------+----------------+------+-----------------+--------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
44.208.<redacted> | 7000 | us-east-1 |
9a41e668-060d-4cfe-bb1e-013f5116422d | 44.208.<redacted> | 9042 |
null | null | 1a | 4.0.5 |
e98b918d-499f-3ccc-8dbe-5af31f685bda | {'-2262036356854762881',
'-4197710115038136897', '-7072386316096662315', '2085255826742630980',
'249732489387853170', '4976300208126705818', '7187184456885833289',
'8777189009399731927'} {code}
To solve temporarily we routed outbound traffic to the private ip to public
using iptables which resulted in successful outbound connections.
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