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ASF GitHub Bot commented on TINKERPOP-2044: ------------------------------------------- Github user robertdale commented on a diff in the pull request: https://github.com/apache/tinkerpop/pull/943#discussion_r221858009 --- Diff: gremlin-driver/src/main/java/org/apache/tinkerpop/gremlin/driver/Cluster.java --- @@ -575,6 +585,8 @@ SslContext createSSLContext() throws Exception { private String trustStore = null; private String trustStorePassword = null; private String keyStoreType = null; + private String validationRequest = "''"; + private boolean useBytecodeForValidation = false; --- End diff -- `useBytecodeForValidation` was added but doesn't appear to be used anywhere else. > 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 > Assignee: stephen mallette > Priority: Major > > 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. > -- This message was sent by Atlassian JIRA (v7.6.3#76005)