Dantis P S created TINKERPOP-2044:
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Summary: Cannot reconnect to Azure cosmos host that becomes
available again
Key: TINKERPOP-2044
URL: https://issues.apache.org/jira/browse/TINKERPOP-2044
Project: TinkerPop
Issue Type: Bug
Components: driver
Affects Versions: 3.3.3
Reporter: Dantis P S
If a Azure Cosmos Gremlin host goes down and if it becomes available again, the
tinkerpop3 java driver cannot reconnect to it.
Sample code is available at [https://github.com/cancure/tinkerpopcosmos]
These are the steps to reproduce -
1) Start the application after providing proper connection details in
remote.yaml file.
2) Call the end point POST [http://localhost:8080/query.] Pass a valid gremlin
query as HTTP body E.g. g.V(1).id()
3) Disconnect computer from internet.
4) Do step 2.
5) Reconnect computer to the internet.
6) Do step 2.
Any query executed from this point onwards gets the error -
"java.lang.RuntimeException: java.util.concurrent.TimeoutException: Timed out
while waiting for an available host - check the client configuration and
connectivity to the server if this message persists".
The issue seems to be coming from
org.apache.tinkerpop.gremlin.driver.ConnectionPool.java. In line #403, the
gremlin query used for ping message is '' (Empty string in single quotes).
final RequestMessage ping =
RequestMessage.build(Tokens.OPS_EVAL).add(Tokens.ARGS_GREMLIN, "''").create();
Cosmos server returns an error saying that the gremlin query's grammar is
incorrect. Because of this error the rest of the lines of the method does not
get executed.
Fix will be to use a gremlin query which is valid for all supported graph DBs.
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