org.apache.hadoop.hive.ql.parse.repl.dump.events.AlterTableHandler Maven / Gradle / Ivy
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package org.apache.hadoop.hive.ql.parse.repl.dump.events;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.metastore.api.NotificationEvent;
import org.apache.hadoop.hive.metastore.messaging.AlterTableMessage;
import org.apache.hadoop.hive.ql.metadata.Table;
import org.apache.hadoop.hive.ql.parse.EximUtil;
import org.apache.hadoop.hive.ql.parse.repl.DumpType;
import org.apache.hadoop.hive.ql.parse.repl.dump.Utils;
import org.apache.hadoop.hive.ql.parse.repl.load.DumpMetaData;
class AlterTableHandler extends AbstractEventHandler {
private final org.apache.hadoop.hive.metastore.api.Table before;
private final org.apache.hadoop.hive.metastore.api.Table after;
private final boolean isTruncateOp;
private final Scenario scenario;
private enum Scenario {
ALTER {
@Override
DumpType dumpType() {
return DumpType.EVENT_ALTER_TABLE;
}
},
RENAME {
@Override
DumpType dumpType() {
return DumpType.EVENT_RENAME_TABLE;
}
},
TRUNCATE {
@Override
DumpType dumpType() {
return DumpType.EVENT_TRUNCATE_TABLE;
}
};
abstract DumpType dumpType();
}
AlterTableHandler(NotificationEvent event) throws Exception {
super(event);
AlterTableMessage atm = deserializer.getAlterTableMessage(event.getMessage());
before = atm.getTableObjBefore();
after = atm.getTableObjAfter();
isTruncateOp = atm.getIsTruncateOp();
scenario = scenarioType(before, after);
}
private Scenario scenarioType(org.apache.hadoop.hive.metastore.api.Table before,
org.apache.hadoop.hive.metastore.api.Table after) {
if (before.getDbName().equals(after.getDbName())
&& before.getTableName().equals(after.getTableName())) {
return isTruncateOp ? Scenario.TRUNCATE : Scenario.ALTER;
} else {
return Scenario.RENAME;
}
}
@Override
public void handle(Context withinContext) throws Exception {
LOG.info("Processing#{} ALTER_TABLE message : {}", fromEventId(), event.getMessage());
Table qlMdTableBefore = new Table(before);
if (!Utils
.shouldReplicate(withinContext.replicationSpec, qlMdTableBefore, withinContext.hiveConf)) {
return;
}
if (Scenario.ALTER == scenario) {
withinContext.replicationSpec.setIsMetadataOnly(true);
Table qlMdTableAfter = new Table(after);
Path metaDataPath = new Path(withinContext.eventRoot, EximUtil.METADATA_NAME);
EximUtil.createExportDump(
metaDataPath.getFileSystem(withinContext.hiveConf),
metaDataPath,
qlMdTableAfter,
null,
withinContext.replicationSpec,
withinContext.hiveConf);
}
DumpMetaData dmd = withinContext.createDmd(this);
dmd.setPayload(event.getMessage());
dmd.write();
}
@Override
public DumpType dumpType() {
return scenario.dumpType();
}
}