fe94bf07f9
### What changes were proposed in this pull request?
Use uuid instead of `System. currentTimeMillis` as app id in kubernetes client mode.
### Why are the changes needed?
Currently, spark on kubernetes with client mode would use `"spark-application-" + System.currentTimeMillis` as app id by default. It would cause app id conflict if submit several spark applications to kubernetes cluster in a short time.
Unfortunately, the event log use app id as the file name. With the conflict event log file, the exception was thrown.
```
Caused by: java.io.FileNotFoundException: File does not exist: xxx/spark-application-1624766876324.lz4.inprogress (inode 5984170846) Holder does not have any open files.
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkLease(FSNamesystem.java:2697)
at org.apache.hadoop.hdfs.server.namenode.FSDirWriteFileOp.analyzeFileState(FSDirWriteFileOp.java:521)
at org.apache.hadoop.hdfs.server.namenode.FSDirWriteFileOp.validateAddBlock(FSDirWriteFileOp.java:161)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:2579)
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:846)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:510)
at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:503)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:989)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:871)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:817)
```
### Does this PR introduce _any_ user-facing change?
yes
### How was this patch tested?
manual test
Closes #33211 from ulysses-you/k8s-appid.
Authored-by: ulysses-you <ulyssesyou18@gmail.com>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
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