Ankesh Khandelwal created TINKERPOP-1999:
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Summary: [Java][gremlin-driver] Query to a remote server via the
websocket client hangs indefinitely if the server becomes unavailable
Key: TINKERPOP-1999
URL: https://issues.apache.org/jira/browse/TINKERPOP-1999
Project: TinkerPop
Issue Type: Bug
Components: driver
Affects Versions: 3.3.3, 3.3.2
Reporter: Ankesh Khandelwal
Fix For: 3.3.3, 3.3.2
Query to a remote server via the websocket client hangs indefinitely if the
server becomes unavailable.
Consider the code snippet below.
{code:java}
// Create a websocket client
final Client client =
Cluster.build().addContactPoint(<endpoint>).create().connect();
// submit a query
ResultSet resultSet = client.submit("g.V().id()");
// wait for all the results
resultSet.all().join();
{code}
If the
{code:java}
client.submit(...){code}
call succeeds (that is the server is available/reachable) but before getting
the results from the server, the server becomes unavailable/unreachable, then
the client code hangs indefinitely at
{code:java}
resultSet.all().join(){code}
.
The right behavior would be to throw an exception indicating the server is not
available anymore. The hanging behavior suggests that the *channelInactive*
call from websocket connection may not be getting propagated properly (perhaps
getting swallowed somewhere).
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