During production environment use, the DGRAPH query is blocked and not responsive until it times out?

Issues Dgraph Clients
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3

Query I as you said, the use of read-only query, the query does not block, but call txn.mutate(mutation);The thread is blocked again and remains unresponsive.

    private void execDGraphQL(UgcNodeEntity newUgcNode) {
        Transaction txn = dgraphClient.newTransaction();
        try {
            String json = JSON.toJSONString(newUgcNode);
            logger.info("execDGraphQL json:{}", json);
            // Run mutation
            DgraphProto.Mutation mutation =
                    DgraphProto.Mutation.newBuilder().setSetJson(ByteString.copyFromUtf8(json)).build();
            DgraphProto.Response res = txn.mutate(mutation);
            logger.info("DGraph create response: {}", res.getJson().toStringUtf8());
            txn.commit();
        } finally {
            txn.discard();
        }
    }

public class UgcNodeEntity {
    private String uid;
    private String type = "UGC";
    private Long ugcId;
    private Long ugcUid;
    private Long rootUgcId;
    private Integer isDeleted;
    private Integer isRoot;
    private Integer forwardCount;
    private Long createTime;
    private Long updateTime;
    private DGraphNode forwardFrom;
}

- parking to wait for  <0x00000006c46d6dd8> (a java.util.concurrent.CompletableFuture$Signaller)
        at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
        at java.util.concurrent.CompletableFuture$Signaller.block(CompletableFuture.java:1707)
        at java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3323)
        at java.util.concurrent.CompletableFuture.waitingGet(CompletableFuture.java:1742)
        at java.util.concurrent.CompletableFuture.join(CompletableFuture.java:1947)
        at io.dgraph.Transaction.lambda$mutate$2(Transaction.java:97)
        at io.dgraph.Transaction$$Lambda$1296/1777856840.get(Unknown Source)
        at io.dgraph.ExceptionUtil.withExceptionUnwrapped(ExceptionUtil.java:18)
        at io.dgraph.Transaction.mutate(Transaction.java:97)
        at com.inveno.rrlike.graph.repository.ForwardUgcRepositoryWithDGraph.execDGraphQL(ForwardUgcRepositoryWithDGraph.java:418)
        at com.inveno.rrlike.graph.repository.ForwardUgcRepositoryWithDGraph.updateOrInsertUgcNode(ForwardUgcRepositoryWithDGraph.java:137)
        at com.inveno.rrlike.graph.repository.ForwardUgcRepositoryWithDGraph$$FastClassBySpringCGLIB$$141aa35f.invoke(<generated>)
        at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)