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07-06-2022 05:18 PM - edited 07-06-2022 05:20 PM
Code using JS driver 4.4.5 is unable to access a Neo4j Enterprise cluster using version 3.5.28.
**Neo4j Version:** 3.5.28 Enterprise
**Neo4j Mode**: Cluster (3 nodes)
**Driver version**: JS driver 4.4.5
**Operating System:** AWS instance operated by 3rd party, so unknown
1. instantiate a driver using the `neo4j+s` scheme
2. create a session and a transaction
3. attempt to run a simple query within that transaction
The query shall run successfully
1. Code instantiates a driver successfully using the `neo4j+s` url scheme
2. Code appears to create a session successfully
3. attempting to run a transaction results in a timeout with subsequent transaction retries
Error returned is:
2022-07-05T02:53:00.803Z c77c6023-7f49-4f9f-8424-03dd20276ebc WARN Failed to performed request. Neo4jError: Could not perform discovery. No routing servers available. Known routing table: RoutingTable[database=default database, expirationTime=0, currentTime=1656989578989, routers=[], readers=[], writers=[]]
:
at captureStacktrace (/opt/nodejs/node_modules/neo4j-driver-core/lib/result.js:239:17)
at new Result (/opt/nodejs/node_modules/neo4j-driver-core/lib/result.js:59:23)
at newCompletedResult (/opt/nodejs/node_modules/neo4j-driver-core/lib/transaction.js:433:12)
at Object.run (/opt/nodejs/node_modules/neo4j-driver-core/lib/transaction.js:287:20)
at Transaction.run (/opt/nodejs/node_modules/neo4j-driver-core/lib/transaction.js:137:34)
at testDBQuery (/var/task/webpack:/insto-db-conn-test/src/models/test.js:7:1)
at /var/task/webpack:/insto-db-conn-test/src/models/test.js:23:1
at TransactionExecutor._safeExecuteTransactionWork (/opt/nodejs/node_modules/neo4j-driver-core/lib/internal/transaction-executor.js:92:26)
at TransactionExecutor._executeTransactionInsidePromise (/opt/nodejs/node_modules/neo4j-driver-core/lib/internal/transaction-executor.js:83:34)
at Timeout._onTimeout (/opt/nodejs/node_modules/neo4j-driver-core/lib/internal/transaction-executor.js:63:23) {
constructor: [Function: Neo4jError],
code: 'ServiceUnavailable'
}
It appears that the driver isn't retrieving the routing table properly? I'm wondering whether the Bolt handshaking isn't detecting that it should be using Bolt protocol v3?
For context, we are attempting to update our code to use the latest driver as a precursor to updating our DB cluster to Neo4j 4.4
Hoping someone might have encountered this before and found a solution?
07-08-2022 01:25 AM
It's not a bug, it's designed that way. Each driver can only connect to a subset of previous neo4j versions.
That should be listed in the driver docs
https://neo4j.com/docs/javascript-manual/current/get-started/#js-driver-get-started-installation
I think you need to go back to an 1.7 driver for neo4j 3.5.x
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