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https://issues.apache.org/jira/browse/CASSANDRA-16271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17233907#comment-17233907
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Krishna Vadali edited comment on CASSANDRA-16271 at 11/17/20, 8:09 PM:
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[~samt] is there any update on this?
was (Author: tejavadali):
[~samt] is. there any update on this?
> Writes timeout instead of failing on cluster with CL-1 replicas available
> during replace
> ----------------------------------------------------------------------------------------
>
> Key: CASSANDRA-16271
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16271
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Coordination
> Reporter: Krishna Vadali
> Assignee: Sam Tunnicliffe
> Priority: Normal
> Attachments: sleep_before_replace.diff
>
>
> Writes timeout instead of failing on cluster with CL-1 replicas available
> during replace node operation.
> With Consistency Level ALL, we are observing Timeout exceptions during writes
> when (RF - 1) nodes are available in the cluster with one replace-node
> operation running. The coordinator is expecting RF + 1 responses, while there
> are only RF nodes (RF-1 nodes in UN and 1 node in UJ) are available in the
> cluster, hence timing out.
> The same problem happens on a keyspace with RF=1, CL=ONE and one replica
> being replaced. Also RF=3, CL=QUORUM, one replica down and another being
> replaced.
> I believe the expected behavior is that the write should fail with
> UnavailableException since there are not enough NORMAL replicas to fulfill
> the request.
> h4. *Steps to reproduce:*
> Run a 3 node test cluster (call the nodes node1 (127.0.0.1), node2
> (127.0.0.2), node3 (127.0.0.3)):
> {code:java}
> ccm create test -v 3.11.3 -n 3 -s
> {code}
> Create test keyspaces with RF = 3 and RF = 1 respectively:
> {code:java}
> create keyspace rf3 with replication = \{'class': 'SimpleStrategy',
> 'replication_factor': 3};
> create keyspace rf1 with replication = \{'class': 'SimpleStrategy',
> 'replication_factor': 1};
> {code}
> Create a table test in both the keyspaces:
> {code:java}
> create table rf3.test ( pk int primary KEY, value int);
> create table rf1.test ( pk int primary KEY, value int);
> {code}
> Stop node node2:
> {code:java}
> ccm node2 stop
> {code}
> Create node node4:
> {code:java}
> ccm add node4 -i 127.0.0.4
> {code}
> Enable auto_bootstrap
> {code:java}
> ccm node4 updateconf 'auto_bootstrap: true'
> {code}
> Ensure node4 does not have itself in its seeds list.
> Run a replace node to replace node2 (address 127.0.0.2 corresponds to node
> node2)
> {code:java}
> ccm node4 start --jvm_arg="-Dcassandra.replace_address=127.0.0.2"
> {code}
> When the replace node is running, perform write/reads with CONSISTENCY ALL,
> we observed TimeoutException.
> {code:java}
> SET CONSISTENCY ALL:SET CONSISTENCY ALL:
> cqlsh> insert into rf3.test (pk, value) values (16, 7);
> WriteTimeout: Error from server: code=1100 [Coordinator node timed out
> waiting for replica nodes' responses] message="Operation timed out - received
> only 3 responses." info=\{'received_responses': 3, 'required_responses': 4,
> 'consistency': 'ALL'}{code}
> {code:java}
> cqlsh> CONSISTENCY ONE;
> cqlsh> insert into rf1.test (pk, value) VALUES(5, 1);
> WriteTimeout: Error from server: code=1100 [Coordinator node timed out
> waiting for replica nodes' responses] message="Operation timed out - received
> only 1 responses." info=\{'received_responses': 1, 'required_responses': 2,
> 'consistency': 'ONE'}
> {code}
> Cluster State:
> {code:java}
> Datacenter: datacenter1
> =======================
> Status=Up/Down
> |/ State=Normal/Leaving/Joining/Moving
> -- Address Load Tokens Owns (effective) Host ID
> Rack
> UN 127.0.0.1 70.45 KiB 1 100.0%
> 4f652b22-045b-493b-8722-fb5f7e1723ce rack1
> UN 127.0.0.3 70.43 KiB 1 100.0%
> a0dcd677-bdb3-4947-b9a7-14f3686a709f rack1
> UJ 127.0.0.4 137.47 KiB 1 ?
> e3d794f1-081e-4aba-94f2-31950c713846 rack1
> {code}
> Note:
> We introduced sleep during replace operation in order to simulate do our
> experiments. We attached code diff that does it.
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