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https://issues.apache.org/jira/browse/HIVE-13132?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anthony Hsu resolved HIVE-13132.
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Resolution: Won't Fix
> Hive should lazily load and cache metastore (permanent) functions
> -----------------------------------------------------------------
>
> Key: HIVE-13132
> URL: https://issues.apache.org/jira/browse/HIVE-13132
> Project: Hive
> Issue Type: Improvement
> Affects Versions: 0.13.1
> Reporter: Anthony Hsu
> Assignee: Anthony Hsu
> Attachments: HIVE-13132.1.patch
>
>
> In Hive 0.13.1, we have noticed that as the number of databases increases,
> the start-up time of the Hive interactive shell increases. This is because
> during start-up, all databases are iterated over to fetch the permanent
> functions to display in the {{SHOW FUNCTIONS}} output.
> {noformat:title=FunctionRegistry.java}
> private static Set<String> getFunctionNames(boolean searchMetastore) {
> Set<String> functionNames = mFunctions.keySet();
> if (searchMetastore) {
> functionNames = new HashSet<String>(functionNames);
> try {
> Hive db = getHive();
> List<String> dbNames = db.getAllDatabases();
> for (String dbName : dbNames) {
> List<String> funcNames = db.getFunctions(dbName, "*");
> for (String funcName : funcNames) {
> functionNames.add(FunctionUtils.qualifyFunctionName(funcName,
> dbName));
> }
> }
> } catch (Exception e) {
> LOG.error(e);
> // Continue on, we can still return the functions we've gotten to
> this point.
> }
> }
> return functionNames;
> }
> {noformat}
> Instead of eagerly loading all metastore functions, we should only load them
> the first time {{SHOW FUNCTIONS}} is invoked. We should also cache the
> results.
> Note that this issue may have been fixed by HIVE-2573, though I haven't
> verified this.
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