Have you taken jstack for the slow scans ?
If so, can you pastebin the stack trace ?
1.0.0 is quite old.
Any chance of upgrading to 1.2 release ?
Cheers
> On Oct 10, 2016, at 2:04 AM, 陆巍 <luwei...@163.com> wrote:
>
> Hi All,
>
> I met with a problem where the scan perfoamance decreases over time.
> Hbase connections are kept in a data access service (in tomcat), and there
> are table scan operations. The scan performance for each scan batch(~10
> parallel scan) increases as below:
> day avg. cost(ms)
> 1 56.213115
> 2 43.697054
> 3 36.925063
> 4 50.683257
> 5 62.749022
> 6 84.943314
> 7 92.237783
> 8 94.452549
> 9 103.853937
> 10 114.725657
> 11 128.601287
>
> The time cost for each remote scan batch is now over 100ms.
> In order to make sure Hbase cluster is fine, I started another same data
> access service, but find the time cost is around 30ms. So, I think hbase
> cluster is fine and the problem is in the data access service, which is the
> client of hbase.
>
> I do believe there is some resource missed to release, but really have no
> idea where it is.
> I am using hbase 1.0.0-chd5.5.1.
>
> Here is the code:
> // the connection is created as a static instance:
> connection=ConnectionFactory.createConnection(getConfiguration())
> // scan logic for each remote call
> try {
> Table table = connection.getTable(tableName);
> rs = table.getScanner(scan);
> } finally {
> rs.close();
> table.close();
> }
>
>
>
> Thanks,
> Wei
