Hi, 

Thank you very much for reaching out, 

- Phoenix version: 4.12.0-HBase-1.2
- Hbase: 1.2.6
- Hadoop: 2.8.1


DEBUG from PQS: 

2017-11-23 04:27:46,157 WARN org.apache.hadoop.hbase.client.ScannerCallable: Ignore, probably already closed
org.apache.hadoop.hbase.UnknownScannerException: org.apache.hadoop.hbase.UnknownScannerException: Unknown scanner '14111'. This can happen due$
If the issue is due to reason (b), a possible fix would be increasing the value of'hbase.client.scanner.timeout.period' configuration.
        at org.apache.hadoop.hbase.regionserver.RSRpcServices.scan(RSRpcServices.java:2394)
        at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:33648)
        at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2196)
        at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:112)
        at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:133)
        at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:108)
        at java.lang.Thread.run(Thread.java:748)

The exception thrown in the python client is attached. 

The two query sent was something like this: 

(SELECT COL1, COL2, COL3, COL4, COL5 FROM SALESTABLE WHERE PURCHSHED_DATE>=TO_TIMESTAMP(d) AND PURCHSHED_DATE<=TO_TIMESTAMP(d)) Having real data of 1 million records. 
(SELECT * FROM USERS) Having dummy data of 10 records. 

I've one namenode and one datanode. 

Thank you for the help.

On Thu, Nov 23, 2017 at 4:42 AM, Josh Elser <elserj@apache.org> wrote:
There is no such configuration which would preclude your ability to issue two queries concurrently.

Some relevant information you should share if you'd like more help:

* Versions of HDFS, HBase, and Phoenix
* What your "request" is
* Thread-dump (e.g. jstack) of your client and the PQS
* DEBUG logs from PQS


On 11/21/17 12:30 AM, Vaghawan Ojha wrote:
Hi,

I've a one Namenode server and another Datanode server, phoenix query server are running on both.

For a single request, everything is fine, but when I do multiple requests simultaneously, the query server timeouts , the table consists only 2-3 gbs of data.

I think, I'm missing some configuration to manage this, if somebody could help me out, it would be great.

Thank you
Vaghawan