qiuchenjian opened a new pull request #3130: [CARBONDATA-3297] Fix that the IndexoutOfBoundsException when creating table and dropping table are at the same time
URL:
https://github.com/apache/carbondata/pull/3130
### [Problem]
Throw the IndexoutOfBoundsException when creating table and dropping table are at the same time
`java.lang.IndexOutOfBoundsException: 179
at scala.collection.mutable.ResizableArray$class.apply(ResizableArray.scala:43)
at scala.collection.mutable.ArrayBuffer.apply(ArrayBuffer.scala:48)
at scala.collection.IndexedSeqOptimized$class.segmentLength(IndexedSeqOptimized.scala:195)
at scala.collection.mutable.ArrayBuffer.segmentLength(ArrayBuffer.scala:48)
at scala.collection.GenSeqLike$class.prefixLength(GenSeqLike.scala:93)
at scala.collection.AbstractSeq.prefixLength(Seq.scala:41)
at scala.collection.IndexedSeqOptimized$class.find(IndexedSeqOptimized.scala:50)
at scala.collection.mutable.ArrayBuffer.find(ArrayBuffer.scala:48)
at org.apache.spark.sql.hive.CarbonFileMetastore.getTableFromMetadataCache(CarbonFileMetastore.scala:203)
at org.apache.spark.sql.CarbonEnv$.getCarbonTable(CarbonEnv.scala:203)
at org.apache.spark.sql.CarbonEnv$.getTablePath(CarbonEnv.scala:288)
at org.apache.spark.sql.execution.command.table.CarbonCreateTableCommand$$anonfun$1.apply(CarbonCreateTableCommand.scala:74)
at org.apache.spark.sql.execution.command.table.CarbonCreateTableCommand$$anonfun$1.apply(CarbonCreateTableCommand.scala:74)`
### [Solution]
1. The type of carbonTables in MetaData.class is ArrayBuffer, and the ArrayBuffer is not thread-safe, so it throw this exception when creating table and dropping table are at the same time
2. Use read write lock to guarantee the thread-safe
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- [ ] Any backward compatibility impacted?
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- [ ] For large changes, please consider breaking it into sub-tasks under an umbrella JIRA.
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