Catalog get table API return null sometimes

[humengyu2012]

Bug Report

1. Describe the bug

When I use method catalog.getTable(db,table), I may get a null object of TiTableInfo. I use client-java in mapreduce, and there are more than 2000 calls of the method catalog.getTable(db,table), each mapper will call one or more times. I found that a very small proportion(1%) of mappers will get null TiTableInfo object.

Caused by: org.apache.hadoop.hive.serde2.SerDeException: java.lang.IllegalStateException: Table `tag_core`.`content_tag_object_relation` no longer exists in TiDB
        at io.tidb.bigdata.hive.TiDBSerde.initialize(TiDBSerde.java:62)
        at org.apache.hadoop.hive.serde2.AbstractSerDe.initialize(AbstractSerDe.java:54)
        at org.apache.hadoop.hive.serde2.SerDeUtils.initializeSerDe(SerDeUtils.java:531)
        at org.apache.hadoop.hive.ql.plan.PartitionDesc.getDeserializer(PartitionDesc.java:177)
        at org.apache.hadoop.hive.ql.exec.MapOperator.initObjectInspector(MapOperator.java:186)
        at org.apache.hadoop.hive.ql.exec.MapOperator.setChildren(MapOperator.java:386)
        at org.apache.hadoop.hive.ql.exec.mr.ExecMapper.configure(ExecMapper.java:106)
        ... 22 more
Caused by: java.lang.IllegalStateException: Table `tag_core`.`content_tag_object_relation` no longer exists in TiDB
        at io.tidb.bigdata.tidb.ClientSession.lambda$getTableMust$0(ClientSession.java:173)
        at java.util.Optional.orElseThrow(Optional.java:290)
        at io.tidb.bigdata.tidb.ClientSession.getTableMust(ClientSession.java:171)
        at io.tidb.bigdata.tidb.ClientSession.getTableColumnsMust(ClientSession.java:227)
        at io.tidb.bigdata.hive.TiDBSerde.initialize(TiDBSerde.java:60)
        ... 28 more

The implements of ClientSession.lambda$getTableMust$0(ClientSession.java:173) is:

2. Minimal reproduce step (Required)

I can't reproduce it because it happens by accident.

3. What did you see instead (Required)

4. What did you expect to see? (Required)

5. What are your Java Client and TiKV versions? (Required)

• Client Java: 3.2.0
• TiKV: 5.0.2