Github user ykrips commented on a diff in the pull request:
https://github.com/apache/tajo/pull/216#discussion_r20127482
--- Diff:
tajo-catalog/tajo-catalog-server/src/main/java/org/apache/tajo/catalog/store/AbstractDBStore.java
---
@@ -176,42 +202,47 @@ public Connection getConnection() {
return conn;
}
- private void verifySchemaVersion() throws CatalogException {
+ private int getSchemaVersion() {
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet result = null;
+ int schemaVersion = -1;
+
+ String sql = "SELECT version FROM META";
+ if (LOG.isDebugEnabled()) {
+ LOG.debug(sql.toString());
+ }
try {
- String sql = "SELECT version FROM META";
- if (LOG.isDebugEnabled()) {
- LOG.debug(sql.toString());
- }
-
conn = getConnection();
pstmt = conn.prepareStatement(sql);
result = pstmt.executeQuery();
- boolean noVersion = !result.next();
-
- int schemaVersion = result.getInt(1);
- if (noVersion || schemaVersion != getDriverVersion()) {
- LOG.error(String.format("Catalog version (%d) and current driver
version (%d) are mismatch to each other",
- schemaVersion, getDriverVersion()));
-
LOG.error("=========================================================================");
- LOG.error("| Catalog Store Migration Is Needed
|");
-
LOG.error("=========================================================================");
- LOG.error("| You might downgrade or upgrade Apache Tajo.
Downgrading or upgrading |");
- LOG.error("| Tajo without migration process is only available in
some versions. |");
- LOG.error("| In order to learn how to migration Apache Tajo
instance, |");
- LOG.error("| please refer http://s.apache.org/0_8_migration.
|");
-
LOG.error("=========================================================================");
- throw new CatalogException("Migration Needed. Please refer
http://s.apache.org/0_8_migration.";);
+ if (result.next()) {
+ schemaVersion = result.getInt("VERSION");
}
} catch (SQLException e) {
- throw new CatalogException(e);
+ throw new CatalogException(e.getMessage(), e);
} finally {
CatalogUtil.closeQuietly(pstmt, result);
}
+
+ return schemaVersion;
+ }
+
+ private void verifySchemaVersion() throws CatalogException {
+ int schemaVersion = -1;
+
+ schemaVersion = getSchemaVersion();
+
+ if (schemaVersion == -1 || schemaVersion != getDriverVersion()) {
+ LOG.info(String.format("Catalog version (%d) and current driver
version (%d) are mismatch to each other",
+ schemaVersion, getDriverVersion()));
+ LOG.info("It will start upgrade process on catalog stores.");
+
+ catalogSchemaManager.upgradeBaseSchema(getConnection(),
schemaVersion);
--- End diff --
I think that difference on upgrade approach might come with who will
perform upgrade processes on Tajo. My approach considers software engineers who
do not know about RDBMS or do not have the privileges on RDBMS. However, with
your approach, it is needed to engage database administrator when upgrading
catalog information. Both approaches have pros and cons, but if catalog schema
has changed rapidly, your approach may be suitable. My approach will be
difficult to maintain the catalog schema if these changes occur frequently.
I will restore source codes on version check, and will commit soon.
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