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https://issues.apache.org/jira/browse/DRILL-7115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16807519#comment-16807519
]
ASF GitHub Bot commented on DRILL-7115:
---------------------------------------
vdiravka commented on pull request #1706: DRILL-7115: Improve Hive schema show
tables performance
URL: https://github.com/apache/drill/pull/1706#discussion_r271160223
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/store/dfs/WorkspaceSchemaFactory.java
##########
@@ -67,23 +66,24 @@
import org.apache.drill.exec.store.AbstractSchema;
import org.apache.drill.exec.store.PartitionNotFoundException;
import org.apache.drill.exec.store.SchemaConfig;
-import org.apache.drill.exec.util.DrillFileSystemUtil;
import org.apache.drill.exec.store.StorageStrategy;
import org.apache.drill.exec.store.easy.json.JSONFormatPlugin;
+import org.apache.drill.exec.util.DrillFileSystemUtil;
import org.apache.drill.exec.util.ImpersonationUtil;
+import org.apache.drill.shaded.guava.com.google.common.base.Joiner;
+import org.apache.drill.shaded.guava.com.google.common.base.Strings;
+import org.apache.drill.shaded.guava.com.google.common.collect.ImmutableList;
+import org.apache.drill.shaded.guava.com.google.common.collect.Lists;
+import org.apache.drill.shaded.guava.com.google.common.collect.Sets;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsAction;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.security.AccessControlException;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import org.apache.drill.shaded.guava.com.google.common.base.Joiner;
-import org.apache.drill.shaded.guava.com.google.common.base.Strings;
-import org.apache.drill.shaded.guava.com.google.common.collect.ImmutableList;
-import org.apache.drill.shaded.guava.com.google.common.collect.Lists;
-import org.apache.drill.shaded.guava.com.google.common.collect.Sets;
+import static java.util.Collections.unmodifiableList;
Review comment:
Usually we don't touch imports ordering, since different IDE can change it
for a lot of classes.
But it is ok here.
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> Improve Hive schema show tables performance
> -------------------------------------------
>
> Key: DRILL-7115
> URL: https://issues.apache.org/jira/browse/DRILL-7115
> Project: Apache Drill
> Issue Type: Improvement
> Components: Storage - Hive, Storage - Information Schema
> Affects Versions: 1.15.0
> Reporter: Igor Guzenko
> Assignee: Igor Guzenko
> Priority: Major
> Fix For: 1.16.0
>
>
> In Sqlline(Drill), "show tables" on a Hive schema is taking nearly 15mins to
> 20mins. The schema has nearly ~8000 tables.
> Whereas the same in beeline(Hive) is throwing the result in a split second(~
> 0.2 secs).
> I tested the same in my test cluster by creating 6000 tables(empty!) in Hive
> and then doing "show tables" in Drill. It took more than 2 mins(~140 secs).
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