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Reduce number of calls to fetch table schema from HMS #1794

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Nov 23, 2020
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Reduce number of calls to fetch table schema from HMS #1794

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7 changes: 6 additions & 1 deletion mr/src/main/java/org/apache/iceberg/mr/hive/HiveIcebergStorageHandler.java
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Original file line number Diff line number Diff line change
Expand Up @@ -73,10 +73,15 @@ public HiveAuthorizationProvider getAuthorizationProvider() throws HiveException
public void configureInputJobProperties(TableDesc tableDesc, Map<String, String> map) {
Properties props = tableDesc.getProperties();
Table table = Catalogs.loadTable(conf, props);
String schemaJson = SchemaParser.toJson(table.schema());

map.put(InputFormatConfig.TABLE_IDENTIFIER, props.getProperty(Catalogs.NAME));
map.put(InputFormatConfig.TABLE_LOCATION, table.location());
map.put(InputFormatConfig.TABLE_SCHEMA, SchemaParser.toJson(table.schema()));
map.put(InputFormatConfig.TABLE_SCHEMA, schemaJson);

// save schema into table props as well to avoid repeatedly hitting the HMS during serde initializations
// this is an exception to the interface documentation, but it's a safe operation to add this property
props.put(InputFormatConfig.TABLE_SCHEMA, schemaJson);
}

@Override
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