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From Jaanai Zhang <>
Subject Re: Phoenix JDBC Connection Warmup
Date Thu, 31 Jan 2019 06:53:54 GMT
It is expected when firstly query tables after establishing the connection.
Something likes loads some meta information into local cache that need take
some time,  mainly including two aspects: 1. access SYSTEM.CATALOG table to
get schema information of the table  2. access the meta table of HBase to
get regions information of the table

   Jaanai Zhang
   Best regards!

William Shen <> 于2019年1月31日周四 下午1:37写道:

> Hi there,
> I have a component that makes Phoenix queries via the Phoenix JDBC
> Connection. I noticed that consistently, the Phoenix Client takes longer to
> execute a PreparedStatement and it takes longer to read through the
> ResultSet for a period of time (~15m) after a restart of the component. It
> seems like there is a warmup period for the JDBC connection. Is this to be
> expected?
> Thanks!

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