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From David Newberger <david.newber...@wandcorp.com>
Subject RE: Creating a Hive table through Spark and potential locking issue (a bug)
Date Wed, 08 Jun 2016 19:22:30 GMT
Could you be looking at 2 jobs trying to use the same file and one getting to it before the
other and finally removing it?

David Newberger

From: Mich Talebzadeh [mailto:mich.talebzadeh@gmail.com]
Sent: Wednesday, June 8, 2016 1:33 PM
To: user; user @spark
Subject: Creating a Hive table through Spark and potential locking issue (a bug)


Hi,

I noticed an issue with Spark creating and populating a Hive table.

The process as I see is as follows:


  1.  Spark creates the Hive table. In this case an ORC table in a Hive Database
  2.  Spark uses JDBC connection to get data out from an Oracle
  3.  I create a temp table in Spark through (registerTempTable)
  4.  Spark populates that table. That table is actually created in

       hdfs dfs -ls /tmp/hive/hduser
       drwx------   - hduser supergroup
       /tmp/hive/hduser/b1ea6829-790f-4b37-a0ff-3ed218388059



  1.  However, The original table itself does not have any locking on it!
  2.  I log in into Hive and drop that table

3. hive> drop table dummy;
OK


  1.   That table is dropped OK
  2.  Spark crashes with message
Started at
[08/06/2016 18:37:53.53]
16/06/08 19:13:46 ERROR Executor: Exception in task 0.0 in stage 1.0 (TID 1)
org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException):
No lease on /user/hive/warehouse/oraclehadoop.db/dummy/.hive-staging_hive_2016-06-08_18-38-08_804_3299712811201460314-1/-ext-10000/_temporary/0/_temporary/attempt_201606081838_0001_m_000000_0/part-00000
(inode 831621): File does not exist. Holder DFSClient_NONMAPREDUCE_-1836386597_1 does not
have any open files.
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkLease(FSNamesystem.java:3516)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.analyzeFileState(FSNamesystem.java:3313)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:3169)
        at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:641)
        at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:482)
        at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:619)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:962)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2039)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2035)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2033)
        at org.apache.hadoop.ipc.Client.call(Client.java:1468)
        at org.apache.hadoop.ipc.Client.call(Client.java:1399)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:232)
        at com.sun.proxy.$Proxy22.addBlock(Unknown Source)
        at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:399)
        at sun.reflect.GeneratedMethodAccessor16.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:187)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
        at com.sun.proxy.$Proxy23.addBlock(Unknown Source)
        at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.locateFollowingBlock(DFSOutputStream.java:1532)
        at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1349)
        at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:588)
16/06/08 19:13:46 ERROR TaskSetManager: Task 0 in stage 1.0 failed 1 times; aborting job

Suggested solution.
In a concurrent env, Spark should apply locks in order to prevent such operations. Locks are
kept in Hive meta data table HIVE_LOCKS

HTH
Dr Mich Talebzadeh



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