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new fd43e64a729 [Enhancement](sql-cache) Use update time of hive to avoid
cache miss through multi fe nodes. (#26424)
fd43e64a729 is described below
commit fd43e64a729c4f6c85e48da1f50b05e487f4f6ff
Author: Xiangyu Wang <dut.xian...@gmail.com>
AuthorDate: Fri Nov 10 17:36:00 2023 +0800
[Enhancement](sql-cache) Use update time of hive to avoid cache miss
through multi fe nodes. (#26424)
Now the update time of hms table is generated by every FE node (Use
`System.currentTimestamp()` separately), so the update time of a hms table may
be different between FE nodes, always the same query can not hit the sql-cache
if we submit it more than one times through different FE nodes. This pr mainly
do following changes to avoid this problem.
- Use the `transient_lastDdlTime` instead of `System.currentTimestamp` as
the `schemaUpdateTime` of hms tables
- Use the `eventTime` in hms event instead of `System.currentTimestamp` as
the update time when processing hms events
---
.../doris/catalog/external/HMSExternalTable.java | 32 ++++++++---
.../org/apache/doris/datasource/CatalogMgr.java | 66 +++++++++++++++++-----
.../datasource/hive/event/AddPartitionEvent.java | 2 +-
.../datasource/hive/event/AlterPartitionEvent.java | 6 +-
.../datasource/hive/event/AlterTableEvent.java | 3 +-
.../datasource/hive/event/DropPartitionEvent.java | 3 +-
.../doris/datasource/hive/event/InsertEvent.java | 3 +-
.../datasource/hive/event/MetastoreEvent.java | 13 +++--
.../hive/event/MetastoreEventsProcessor.java | 3 +-
.../org/apache/doris/qe/HmsQueryCacheTest.java | 17 +++---
10 files changed, 108 insertions(+), 40 deletions(-)
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/catalog/external/HMSExternalTable.java
b/fe/fe-core/src/main/java/org/apache/doris/catalog/external/HMSExternalTable.java
index 361d278f8ac..b5e45b5bcfe 100644
---
a/fe/fe-core/src/main/java/org/apache/doris/catalog/external/HMSExternalTable.java
+++
b/fe/fe-core/src/main/java/org/apache/doris/catalog/external/HMSExternalTable.java
@@ -41,6 +41,7 @@ import org.apache.doris.thrift.TTableType;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
+import org.apache.commons.collections.MapUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.hadoop.hive.metastore.api.ColumnStatisticsData;
import org.apache.hadoop.hive.metastore.api.ColumnStatisticsObj;
@@ -82,6 +83,9 @@ public class HMSExternalTable extends ExternalTable {
private static final String TBL_PROP_TXN_PROPERTIES =
"transactional_properties";
private static final String TBL_PROP_INSERT_ONLY = "insert_only";
+
+ private static final String TBL_PROP_TRANSIENT_LAST_DDL_TIME =
"transient_lastDdlTime";
+
private static final String NUM_ROWS = "numRows";
static {
@@ -112,8 +116,8 @@ public class HMSExternalTable extends ExternalTable {
// No as precise as row count in TableStats, but better than none.
private long estimatedRowCount = -1;
- // record the partition update time when enable hms event listener
- protected volatile long partitionUpdateTime;
+ // record the event update time when enable hms event listener
+ protected volatile long eventUpdateTime;
public enum DLAType {
UNKNOWN, HIVE, HUDI, ICEBERG, DELTALAKE
@@ -405,6 +409,20 @@ public class HMSExternalTable extends ExternalTable {
return new HashSet<>(names);
}
+ @Override
+ public List<Column> initSchemaAndUpdateTime() {
+ org.apache.hadoop.hive.metastore.api.Table table =
((HMSExternalCatalog) catalog).getClient()
+ .getTable(dbName, name);
+ // try to use transient_lastDdlTime from hms client
+ schemaUpdateTime = MapUtils.isNotEmpty(table.getParameters())
+ &&
table.getParameters().containsKey(TBL_PROP_TRANSIENT_LAST_DDL_TIME)
+ ?
Long.parseLong(table.getParameters().get(TBL_PROP_TRANSIENT_LAST_DDL_TIME)) *
1000
+ // use current timestamp if lastDdlTime does not exist (hive
views don't have this prop)
+ : System.currentTimeMillis();
+ return initSchema();
+ }
+
+
@Override
public List<Column> initSchema() {
makeSureInitialized();
@@ -635,15 +653,15 @@ public class HMSExternalTable extends ExternalTable {
}
}
- public void setPartitionUpdateTime(long updateTime) {
- this.partitionUpdateTime = updateTime;
+ public void setEventUpdateTime(long updateTime) {
+ this.eventUpdateTime = updateTime;
}
@Override
- // get the max value of `schemaUpdateTime` and `partitionUpdateTime`
- // partitionUpdateTime will be refreshed after processing partition events
with hms event listener enabled
+ // get the max value of `schemaUpdateTime` and `eventUpdateTime`
+ // eventUpdateTime will be refreshed after processing events with hms
event listener enabled
public long getUpdateTime() {
- return Math.max(this.schemaUpdateTime, this.partitionUpdateTime);
+ return Math.max(this.schemaUpdateTime, this.eventUpdateTime);
}
@Override
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/datasource/CatalogMgr.java
b/fe/fe-core/src/main/java/org/apache/doris/datasource/CatalogMgr.java
index e92e6820481..79dd31a26ff 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/datasource/CatalogMgr.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/datasource/CatalogMgr.java
@@ -650,6 +650,44 @@ public class CatalogMgr implements Writable,
GsonPostProcessable {
}
}
+ public void refreshExternalTableFromEvent(String dbName, String tableName,
String catalogName,
+ long updateTime, boolean
ignoreIfNotExists) throws DdlException {
+ CatalogIf catalog = nameToCatalog.get(catalogName);
+ if (catalog == null) {
+ throw new DdlException("No catalog found with name: " +
catalogName);
+ }
+ if (!(catalog instanceof ExternalCatalog)) {
+ throw new DdlException("Only support refresh ExternalCatalog
Tables");
+ }
+ DatabaseIf db = catalog.getDbNullable(dbName);
+ if (db == null) {
+ if (!ignoreIfNotExists) {
+ throw new DdlException("Database " + dbName + " does not exist
in catalog " + catalog.getName());
+ }
+ return;
+ }
+
+ TableIf table = db.getTableNullable(tableName);
+ if (table == null) {
+ if (!ignoreIfNotExists) {
+ throw new DdlException("Table " + tableName + " does not exist
in db " + dbName);
+ }
+ return;
+ }
+ if (!(table instanceof HMSExternalTable)) {
+ return;
+ }
+ ((HMSExternalTable) table).unsetObjectCreated();
+ ((HMSExternalTable) table).setEventUpdateTime(updateTime);
+
Env.getCurrentEnv().getExtMetaCacheMgr().invalidateTableCache(catalog.getId(),
dbName, tableName);
+ ExternalObjectLog log = new ExternalObjectLog();
+ log.setCatalogId(catalog.getId());
+ log.setDbId(db.getId());
+ log.setTableId(table.getId());
+ log.setLastUpdateTime(updateTime);
+ Env.getCurrentEnv().getEditLog().logRefreshExternalTable(log);
+ }
+
public void refreshExternalTable(String dbName, String tableName, String
catalogName, boolean ignoreIfNotExists)
throws DdlException {
CatalogIf catalog = nameToCatalog.get(catalogName);
@@ -704,6 +742,9 @@ public class CatalogMgr implements Writable,
GsonPostProcessable {
table.unsetObjectCreated();
Env.getCurrentEnv().getExtMetaCacheMgr()
.invalidateTableCache(catalog.getId(), db.getFullName(),
table.getName());
+ if (table instanceof HMSExternalTable && log.getLastUpdateTime() > 0) {
+ ((HMSExternalTable)
table).setEventUpdateTime(log.getLastUpdateTime());
+ }
}
public void dropExternalTable(String dbName, String tableName, String
catalogName, boolean ignoreIfExists)
@@ -923,8 +964,8 @@ public class CatalogMgr implements Writable,
GsonPostProcessable {
}
}
- public void addExternalPartitions(String catalogName, String dbName,
String tableName, List<String> partitionNames,
- boolean ignoreIfNotExists)
+ public void addExternalPartitions(String catalogName, String dbName,
String tableName,
+ List<String> partitionNames, long
updateTime, boolean ignoreIfNotExists)
throws DdlException {
CatalogIf catalog = nameToCatalog.get(catalogName);
if (catalog == null) {
@@ -955,14 +996,13 @@ public class CatalogMgr implements Writable,
GsonPostProcessable {
HMSExternalTable hmsTable = (HMSExternalTable) table;
Env.getCurrentEnv().getExtMetaCacheMgr().addPartitionsCache(catalog.getId(),
hmsTable, partitionNames);
- long lastPartitionUpdateTime = System.currentTimeMillis();
- hmsTable.setPartitionUpdateTime(lastPartitionUpdateTime);
+ hmsTable.setEventUpdateTime(updateTime);
ExternalObjectLog log = new ExternalObjectLog();
log.setCatalogId(catalog.getId());
log.setDbId(db.getId());
log.setTableId(table.getId());
log.setPartitionNames(partitionNames);
- log.setLastUpdateTime(lastPartitionUpdateTime);
+ log.setLastUpdateTime(updateTime);
Env.getCurrentEnv().getEditLog().logAddExternalPartitions(log);
}
@@ -993,7 +1033,7 @@ public class CatalogMgr implements Writable,
GsonPostProcessable {
try {
Env.getCurrentEnv().getExtMetaCacheMgr()
.addPartitionsCache(catalog.getId(), hmsTable,
log.getPartitionNames());
- hmsTable.setPartitionUpdateTime(log.getLastUpdateTime());
+ hmsTable.setEventUpdateTime(log.getLastUpdateTime());
} catch (HMSClientException e) {
LOG.warn("Network problem occurs or hms table has been deleted,
fallback to invalidate table cache", e);
Env.getCurrentEnv().getExtMetaCacheMgr().invalidateTableCache(catalog.getId(),
@@ -1001,8 +1041,8 @@ public class CatalogMgr implements Writable,
GsonPostProcessable {
}
}
- public void dropExternalPartitions(String catalogName, String dbName,
String tableName, List<String> partitionNames,
- boolean ignoreIfNotExists)
+ public void dropExternalPartitions(String catalogName, String dbName,
String tableName,
+ List<String> partitionNames, long
updateTime, boolean ignoreIfNotExists)
throws DdlException {
CatalogIf catalog = nameToCatalog.get(catalogName);
if (catalog == null) {
@@ -1032,7 +1072,7 @@ public class CatalogMgr implements Writable,
GsonPostProcessable {
log.setDbId(db.getId());
log.setTableId(table.getId());
log.setPartitionNames(partitionNames);
- log.setLastUpdateTime(System.currentTimeMillis());
+ log.setLastUpdateTime(updateTime);
replayDropExternalPartitions(log);
Env.getCurrentEnv().getEditLog().logDropExternalPartitions(log);
}
@@ -1062,11 +1102,11 @@ public class CatalogMgr implements Writable,
GsonPostProcessable {
HMSExternalTable hmsTable = (HMSExternalTable) table;
Env.getCurrentEnv().getExtMetaCacheMgr()
.dropPartitionsCache(catalog.getId(), hmsTable,
log.getPartitionNames());
- hmsTable.setPartitionUpdateTime(log.getLastUpdateTime());
+ hmsTable.setEventUpdateTime(log.getLastUpdateTime());
}
public void refreshExternalPartitions(String catalogName, String dbName,
String tableName,
- List<String> partitionNames, boolean ignoreIfNotExists)
+ List<String> partitionNames, long updateTime, boolean
ignoreIfNotExists)
throws DdlException {
CatalogIf catalog = nameToCatalog.get(catalogName);
if (catalog == null) {
@@ -1099,7 +1139,7 @@ public class CatalogMgr implements Writable,
GsonPostProcessable {
log.setDbId(db.getId());
log.setTableId(table.getId());
log.setPartitionNames(partitionNames);
- log.setLastUpdateTime(System.currentTimeMillis());
+ log.setLastUpdateTime(updateTime);
replayRefreshExternalPartitions(log);
Env.getCurrentEnv().getEditLog().logInvalidateExternalPartitions(log);
}
@@ -1129,7 +1169,7 @@ public class CatalogMgr implements Writable,
GsonPostProcessable {
Env.getCurrentEnv().getExtMetaCacheMgr()
.invalidatePartitionsCache(catalog.getId(), db.getFullName(),
table.getName(),
log.getPartitionNames());
- ((HMSExternalTable)
table).setPartitionUpdateTime(log.getLastUpdateTime());
+ ((HMSExternalTable) table).setEventUpdateTime(log.getLastUpdateTime());
}
public void registerCatalogRefreshListener(Env env) {
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/AddPartitionEvent.java
b/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/AddPartitionEvent.java
index 8872c9b5965..e1dacbd0b29 100644
---
a/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/AddPartitionEvent.java
+++
b/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/AddPartitionEvent.java
@@ -103,7 +103,7 @@ public class AddPartitionEvent extends
MetastorePartitionEvent {
return;
}
Env.getCurrentEnv().getCatalogMgr()
- .addExternalPartitions(catalogName, dbName,
hmsTbl.getTableName(), partitionNames, true);
+ .addExternalPartitions(catalogName, dbName,
hmsTbl.getTableName(), partitionNames, eventTime, true);
} catch (DdlException e) {
throw new MetastoreNotificationException(
debugString("Failed to process event"), e);
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/AlterPartitionEvent.java
b/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/AlterPartitionEvent.java
index 445d48a1888..4085901de9a 100644
---
a/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/AlterPartitionEvent.java
+++
b/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/AlterPartitionEvent.java
@@ -114,14 +114,14 @@ public class AlterPartitionEvent extends
MetastorePartitionEvent {
if (isRename) {
Env.getCurrentEnv().getCatalogMgr()
.dropExternalPartitions(catalogName, dbName, tblName,
- Lists.newArrayList(partitionNameBefore), true);
+ Lists.newArrayList(partitionNameBefore),
eventTime, true);
Env.getCurrentEnv().getCatalogMgr()
.addExternalPartitions(catalogName, dbName, tblName,
- Lists.newArrayList(partitionNameAfter), true);
+ Lists.newArrayList(partitionNameAfter),
eventTime, true);
} else {
Env.getCurrentEnv().getCatalogMgr()
.refreshExternalPartitions(catalogName, dbName,
hmsTbl.getTableName(),
- Lists.newArrayList(partitionNameAfter), true);
+ Lists.newArrayList(partitionNameAfter),
eventTime, true);
}
} catch (DdlException e) {
throw new MetastoreNotificationException(
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/AlterTableEvent.java
b/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/AlterTableEvent.java
index 85fa3662b6e..706f8cd303d 100644
---
a/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/AlterTableEvent.java
+++
b/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/AlterTableEvent.java
@@ -154,7 +154,8 @@ public class AlterTableEvent extends MetastoreTableEvent {
}
//The scope of refresh can be narrowed in the future
Env.getCurrentEnv().getCatalogMgr()
- .refreshExternalTable(tableBefore.getDbName(),
tableBefore.getTableName(), catalogName, true);
+ .refreshExternalTableFromEvent(tableBefore.getDbName(),
tableBefore.getTableName(),
+ catalogName, eventTime, true);
} catch (Exception e) {
throw new MetastoreNotificationException(
debugString("Failed to process event"), e);
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/DropPartitionEvent.java
b/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/DropPartitionEvent.java
index 738f113f0ed..f71f44cf5ab 100644
---
a/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/DropPartitionEvent.java
+++
b/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/DropPartitionEvent.java
@@ -103,7 +103,8 @@ public class DropPartitionEvent extends
MetastorePartitionEvent {
return;
}
Env.getCurrentEnv().getCatalogMgr()
- .dropExternalPartitions(catalogName, dbName,
hmsTbl.getTableName(), partitionNames, true);
+ .dropExternalPartitions(catalogName, dbName,
hmsTbl.getTableName(),
+ partitionNames, eventTime, true);
} catch (DdlException e) {
throw new MetastoreNotificationException(
debugString("Failed to process event"), e);
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/InsertEvent.java
b/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/InsertEvent.java
index 7436d57c981..1540ca5ea3e 100644
---
a/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/InsertEvent.java
+++
b/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/InsertEvent.java
@@ -83,7 +83,8 @@ public class InsertEvent extends MetastoreTableEvent {
* the file cache of this table,
* but <a href="https://github.com/apache/doris/pull/17932";>this
PR</a> has fixed it.
*/
- Env.getCurrentEnv().getCatalogMgr().refreshExternalTable(dbName,
tblName, catalogName, true);
+
Env.getCurrentEnv().getCatalogMgr().refreshExternalTableFromEvent(dbName,
tblName,
+ catalogName, eventTime, true);
} catch (DdlException e) {
throw new MetastoreNotificationException(
debugString("Failed to process event"), e);
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/MetastoreEvent.java
b/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/MetastoreEvent.java
index b4fc963d980..0a6e830316a 100644
---
a/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/MetastoreEvent.java
+++
b/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/MetastoreEvent.java
@@ -47,10 +47,13 @@ public abstract class MetastoreEvent {
protected final String tblName;
// eventId of the event. Used instead of calling getter on event everytime
- private final long eventId;
+ protected final long eventId;
+
+ // eventTime of the event. Used instead of calling getter on event
everytime
+ protected final long eventTime;
// eventType from the NotificationEvent
- private final MetastoreEventType eventType;
+ protected final MetastoreEventType eventType;
// Actual notificationEvent object received from Metastore
protected final NotificationEvent metastoreNotificationEvent;
@@ -61,6 +64,7 @@ public abstract class MetastoreEvent {
protected MetastoreEvent(long eventId, String catalogName, String dbName,
String tblName, MetastoreEventType eventType) {
this.eventId = eventId;
+ this.eventTime = -1L;
this.catalogName = catalogName;
this.dbName = dbName;
this.tblName = tblName;
@@ -74,6 +78,7 @@ public abstract class MetastoreEvent {
this.dbName = event.getDbName();
this.tblName = event.getTableName();
this.eventId = event.getEventId();
+ this.eventTime = event.getEventTime() * 1000L;
this.eventType = MetastoreEventType.from(event.getEventType());
this.metastoreNotificationEvent = event;
this.catalogName = catalogName;
@@ -163,8 +168,8 @@ public abstract class MetastoreEvent {
*/
private Object[] getLogFormatArgs(Object[] args) {
Object[] formatArgs = new Object[args.length + 2];
- formatArgs[0] = getEventId();
- formatArgs[1] = getEventType();
+ formatArgs[0] = eventId;
+ formatArgs[1] = eventType;
int i = 2;
for (Object arg : args) {
formatArgs[i] = arg;
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/MetastoreEventsProcessor.java
b/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/MetastoreEventsProcessor.java
index 624349f46d6..622d84428fa 100644
---
a/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/MetastoreEventsProcessor.java
+++
b/fe/fe-core/src/main/java/org/apache/doris/datasource/hive/event/MetastoreEventsProcessor.java
@@ -140,9 +140,8 @@ public class MetastoreEventsProcessor extends MasterDaemon {
CatalogIf catalog =
Env.getCurrentEnv().getCatalogMgr().getCatalog(catalogId);
if (catalog instanceof HMSExternalCatalog) {
HMSExternalCatalog hmsExternalCatalog = (HMSExternalCatalog)
catalog;
- List<NotificationEvent> events = Collections.emptyList();
try {
- events = getNextHMSEvents(hmsExternalCatalog);
+ List<NotificationEvent> events =
getNextHMSEvents(hmsExternalCatalog);
if (!events.isEmpty()) {
LOG.info("Events size are {} on catalog [{}]",
events.size(),
hmsExternalCatalog.getName());
diff --git
a/fe/fe-core/src/test/java/org/apache/doris/qe/HmsQueryCacheTest.java
b/fe/fe-core/src/test/java/org/apache/doris/qe/HmsQueryCacheTest.java
index 7af353f23ac..16de423b28d 100644
--- a/fe/fe-core/src/test/java/org/apache/doris/qe/HmsQueryCacheTest.java
+++ b/fe/fe-core/src/test/java/org/apache/doris/qe/HmsQueryCacheTest.java
@@ -120,6 +120,8 @@ public class HmsQueryCacheTest extends AnalyzeCheckTestBase
{
Deencapsulation.setField(tbl, "objectCreated", true);
Deencapsulation.setField(tbl, "rwLock", new
ReentrantReadWriteLock(true));
+ Deencapsulation.setField(tbl, "schemaUpdateTime", NOW);
+ Deencapsulation.setField(tbl, "eventUpdateTime", 0);
new Expectations(tbl) {
{
tbl.getId();
@@ -154,15 +156,16 @@ public class HmsQueryCacheTest extends
AnalyzeCheckTestBase {
minTimes = 0;
result = DLAType.HIVE;
- tbl.getUpdateTime();
+ // mock initSchemaAndUpdateTime and do nothing
+ tbl.initSchemaAndUpdateTime();
minTimes = 0;
- result = NOW;
}
};
Deencapsulation.setField(tbl2, "objectCreated", true);
Deencapsulation.setField(tbl2, "rwLock", new
ReentrantReadWriteLock(true));
-
+ Deencapsulation.setField(tbl2, "schemaUpdateTime", NOW);
+ Deencapsulation.setField(tbl2, "eventUpdateTime", 0);
new Expectations(tbl2) {
{
tbl2.getId();
@@ -197,8 +200,8 @@ public class HmsQueryCacheTest extends AnalyzeCheckTestBase
{
minTimes = 0;
result = DLAType.HIVE;
- // mock init schema and do nothing
- tbl2.initSchema();
+ // mock initSchemaAndUpdateTime and do nothing
+ tbl2.initSchemaAndUpdateTime();
minTimes = 0;
}
};
@@ -383,7 +386,7 @@ public class HmsQueryCacheTest extends AnalyzeCheckTestBase
{
// do nothing
}
long later = System.currentTimeMillis();
- tbl2.setPartitionUpdateTime(later);
+ tbl2.setEventUpdateTime(later);
// check cache mode again
ca.checkCacheMode(System.currentTimeMillis() +
Config.cache_last_version_interval_second * 1000L * 2);
@@ -431,7 +434,7 @@ public class HmsQueryCacheTest extends AnalyzeCheckTestBase
{
// do nothing
}
long later = System.currentTimeMillis();
- tbl2.setPartitionUpdateTime(later);
+ tbl2.setEventUpdateTime(later);
// check cache mode again
ca.checkCacheModeForNereids(System.currentTimeMillis() +
Config.cache_last_version_interval_second * 1000L * 2);
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