Alter command execution "when HDFS is down" results in holding stale data in
MetaStore
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Key: HIVE-1897
URL: https://issues.apache.org/jira/browse/HIVE-1897
Project: Hive
Issue Type: Bug
Components: Metastore
Affects Versions: 0.6.0
Environment: Hadoop 0.20.1, Hive0.6.0 and SUSE Linux Enterprise Server
10 SP2 (i586) - Kernel 2.6.16.60-0.21-smp (5).
Reporter: Chinna Rao Lalam
Lets consider, the *"DFS"* is down ,
And on executing an alter query say *"alter table firsttable rename to
secondtable"*.
the query execution fails with the following exception:
{color:red}
InvalidOperationException(message:Unable to access old location
hdfs://localhost:9000/user/hive/warehouse/firsttable for table
default.firsttable)
{color}
Now after starting the *DFS* and then executing the same query , the client
gets the following exception:
{color:red}
NoSuchObjectException(message:default.firsttable table not found)
{color}
h4.Root Cause
In Alter Query execution flow, first *"MetaStore"* operation is executed
successfully and then *"DFS"* operation is started. In this scenario, *"DFS"*
is down. As a result, execution of the query failed and partial information of
the operation is saved.
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