Re: Programmatically read the last 10 records from HBase via Thrift call (was: hbase thrift nodejs reverse scan on CDH)

[Jens Geyer <je...@hotmail.com>]

Hi Tom,

unfortunately, your question is a bit out of scope on this mailing list, 
which deals with the usage of the Thrift RPC framework, not with 
HBase-related questions. I'd therefore recommend to
- either ask at http://hbase.apache.org/mail-lists.html
- or (as you already did) at SO:
http://stackoverflow.com/questions/27713082/programmatically-read-the-last-10-records-from-hbase-via-thrift-call

Have fun,
JensG

-----Ursprüngliche Nachricht----- 
From: Abraham Tom
Sent: Tuesday, December 30, 2014 11:17 PM
To: user@thrift.apache.org
Subject: hbase thrift nodejs reverse scan on CDH

In hbase shell I can

scan 't1', { LIMIT=>10, REVERSED => TRUE}

and I can see the last 10 records loaded into table



When I try the logically same function in node.js via thrift the returned
results are the first 10



thrift logs at trace level
2014-12-30 21:23:31,652 TRACE org.apache.hadoop.hbase.client.ClientScanner:
Scan table=t1, startRow=000000030000
2014-12-30 21:23:31,652 DEBUG org.apache.hadoop.ipc.RpcClient: Use SIMPLE
authentication for service ClientService, sasl=false
2014-12-30 21:23:31,652 DEBUG org.apache.hadoop.ipc.RpcClient: Connecting
to hdpnode1/127.0.0.1:60020
2014-12-30 21:23:31,653 DEBUG org.apache.hadoop.ipc.RpcClient: IPC Client
(2037671159) connection to hdpnode1/127.0.0.1:60020 from hbase: starting,
connections 1
2014-12-30 21:23:31,653 DEBUG org.apache.hadoop.ipc.RpcClient: IPC Client
(2037671159) connection to hdpnode1/127.0.0.1:60020 from hbase: wrote
request header call_id: 45 method_name: "Scan" request_param: true
2014-12-30 21:23:31,654 DEBUG org.apache.hadoop.ipc.RpcClient: IPC Client
(2037671159) connection to hdpnode1/127.0.0.1:60020 from hbase: got
response header call_id: 45, totalSize: 14 bytes
2014-12-30 21:23:31,654 TRACE org.apache.hadoop.ipc.RpcClient: Call: Scan,
callTime: 2ms
2014-12-30 21:23:31,736 DEBUG
org.apache.hadoop.hbase.thrift.ThriftServerRunner$HBaseHandler:
scannerGetList: id=23
2014-12-30 21:23:31,737 DEBUG org.apache.hadoop.ipc.RpcClient: IPC Client
(2037671159) connection to hdpnode1/127.0.0.1:60020 from hbase: wrote
request header call_id: 46 method_name: "Scan" request_param: true
2014-12-30 21:23:31,738 DEBUG org.apache.hadoop.ipc.RpcClient: IPC Client
(2037671159) connection to hdpnode1/127.0.0.1:60020 from hbase: got
response header call_id: 46 cell_block_meta { length: 47600 }, totalSize:
47821 bytes
2014-12-30 21:23:31,738 TRACE org.apache.hadoop.ipc.RpcClient: Call: Scan,
callTime: 2ms
2014-12-30 21:23:41,737 DEBUG org.apache.hadoop.ipc.RpcClient: IPC Client
(2037671159) connection to hdpnode1/127.0.0.1:60020 from hbase: closed
2014-12-30 21:23:41,737 DEBUG org.apache.hadoop.ipc.RpcClient: IPC Client
(2037671159) connection to hdpnode1/127.0.0.1:60020 from hbase: stopped,
connections 0



Questions are

1. how can I tell that I am passing the correct parameter to thrift

2. does thrift-nodejs support it



I am on CDH 5.3

hbase 0.98.6

I am trying to leverge the reversed option in a scan via thrift (node.js to
be specific)

Thrift set to hsha and per CM it should be framed

nodejs compiled from https://thrift.apache.org/tutorial/nodejs


-- 
Abraham Tom
Email:   work2much@gmail.com
Phone:  415-515-3621