Neptune openCypher status servlet and status endpoint

Status query parameters

• includeWaiting (true or false)   –   When set to true and other parameters are not present, causes status information for waiting queries to be returned as well as for running queries.

• cancelQuery   –   Used only with GET and POST methods, to indicate that this is a cancelation request. The DELETE method does not need this parameter.

  The value of the cancelQuery parameter is not used, but when cancelQuery is present, the queryId parameter is required, to identify which query to cancel.

• queryId   –   Contains the ID of a specific query.

  When used with the GET or POST method and the cancelQuery parameter is not present, queryId causes status information to be returned for the specific query it identifies. If the cancelQuery parameter is present, then the specific query that queryId identifies is canceled.

  When used with the DELETE method, queryId always indicates a specific query to be canceled.

• silent   –   Only used when canceling a query. If set to true, causes the cancelation to happen silently.

Status response fields if the ID of a specific query is not provided

• acceptedQueryCount   –   The number of queries that have been accepted but not yet completed, including queries in the queue.

• runningQueryCount   –   The number of currently running openCypher queries.

• queries   –   A list of the current openCypher queries.

Status response fields for a specific query

• queryId   –   A GUID id for the query. Neptune automatically assigns this ID value to each query, or you can also assign your own ID (see Inject a Custom ID Into a Neptune Gremlin or SPARQL Query).

• queryString   –   The submitted query. This is truncated to 1024 characters if it is longer than that.

• queryEvalStats   –   Statistics for this query:

  • waited   –   Indicates how long the query waited, in milliseconds.

  • elapsed   –   The number of milliseconds the query has been running so far.

  • cancelled   –   True indicates that the query was cancelled, or False that it has not been cancelled.

• Request for the status of all queries, including those waiting:

  curl https://server:port/openCypher/status \
    --data-urlencode "includeWaiting=true"

  Response:

  {
    "acceptedQueryCount" : 0,
    "runningQueryCount" : 0,
    "queries" : [ ]
  }

• Request for the status of running queries, not including those waiting::

  curl https://server:port/openCypher/status

  Response:

  {
    "acceptedQueryCount" : 0,
    "runningQueryCount" : 0,
    "queries" : [ ]
  }

• Request for the status of a single query:

  curl https://server:port/openCypher/status \
   --data-urlencode "queryId=eadc6eea-698b-4a2f-8554-5270ab17ebee"

  Response:

  {
    "queryId" : "eadc6eea-698b-4a2f-8554-5270ab17ebee",
    "queryString" : "MATCH (n1)-[:knows]->(n2), (n2)-[:knows]->(n3), (n3)-[:knows]->(n4), (n4)-[:knows]->(n5), (n5)-[:knows]->(n6), (n6)-[:knows]->(n7), (n7)-[:knows]->(n8), (n8)-[:knows]->(n9), (n9)-[:knows]->(n10) RETURN COUNT(n1);",
    "queryEvalStats" : {
      "waited" : 0,
      "elapsed" : 23463,
      "cancelled" : false
    }
  }

• Requests to cancel a query

  1. Using POST:

  curl -X POST https://server:port/openCypher/status \
    --data-urlencode "cancelQuery" \
    --data-urlencode "queryId=f43ce17b-db01-4d37-a074-c76d1c26d7a9"

  Response:

  {
    "status" : "200 OK",
    "payload" : true
  }

  2. Using GET:

  curl -X GET https://server:port/openCypher/status \
    --data-urlencode "cancelQuery" \
    --data-urlencode "queryId=588af350-cfde-4222-bee6-b9cedc87180d"

  Response:

  {
    "status" : "200 OK",
    "payload" : true
  }

  3. Using DELETE:

  curl -X DELETE \
    -s "https://server:port/openCypher/status?queryId=b9a516d1-d25c-4301-bb80-10b2743ecf0e"

  Response:

  {
    "status" : "200 OK",
    "payload" : true
  }