[jira] [Created] (IMPALA-8910) Catalog startup option should define how many tables web-ui displays

["Limengjun (Jira)" <ji...@apache.org>]

Limengjun created IMPALA-8910:
---------------------------------

             Summary: Catalog startup option should define how many tables web-ui displays
                 Key: IMPALA-8910
                 URL: https://issues.apache.org/jira/browse/IMPALA-8910
             Project: IMPALA
          Issue Type: Improvement
          Components: Catalog
    Affects Versions: Impala 2.12.0
            Reporter: Limengjun


Impala 2.12 starts to expose Top-N Tables with Highest Number of Metadata Operations
and Memory Requirements, which default to 25. In source code of Impala-Catalog 2.12, the value of N is set as follows:

 
{code:java}
private CatalogUsageMonitor() {
  final int num_tables_tracked = Integer.getInteger(
      "org.apache.impala.catalog.CatalogUsageMonitor.NUM_TABLES_TRACKED", 25);

}
{code}
We can set N as 50 by adding an arg into catalog config(/etc/default/impala), like:

 

 
{code:java}
IMPALA_CATALOG_JAVA_OPTS="$IMPALA_CATALOG_JAVA_OPTS -Dorg.apache.impala.catalog.CatalogUsageMonitor.NUM_TABLES_TRACKED=50"{code}
 

So, we should document how to set NUM_TABLES_TRACKED



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