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From "Vihang Karajgaonkar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-15355) Concurrency issues during parallel moveFile due to HDFSUtils.setFullFileStatus
Date Sun, 04 Dec 2016 21:47:58 GMT
Vihang Karajgaonkar created HIVE-15355:
------------------------------------------

             Summary: Concurrency issues during parallel moveFile due to HDFSUtils.setFullFileStatus
                 Key: HIVE-15355
                 URL: https://issues.apache.org/jira/browse/HIVE-15355
             Project: Hive
          Issue Type: Bug
    Affects Versions: 2.1.0, 2.2.0
            Reporter: Vihang Karajgaonkar
            Assignee: Vihang Karajgaonkar


It is possible to run into concurrency issues during multi-threaded moveFile issued when processing
queries like {{INSERT OVERWRITE TABLE ... SELECT ..}} when there are multiple files in the
staging directory which is a subdirectory of the target directory. The issue is hard to reproduce
but following stacktrace is one such example:

{noformat}
INFO  : Loading data to table functional_text_gzip.alltypesaggmultifilesnopart from hdfs://localhost:20500/test-warehouse/alltypesaggmultifilesnopart_text_gzip/.hive-staging_hive_2016-12-01_19-58-21_712_8968735301422943318-1/-ext-10000
ERROR : Failed with exception java.lang.ArrayIndexOutOfBoundsException
org.apache.hadoop.hive.ql.metadata.HiveException: java.lang.ArrayIndexOutOfBoundsException
        at org.apache.hadoop.hive.ql.metadata.Hive.moveFile(Hive.java:2858)
        at org.apache.hadoop.hive.ql.metadata.Hive.replaceFiles(Hive.java:3124)
        at org.apache.hadoop.hive.ql.metadata.Hive.loadTable(Hive.java:1701)
        at org.apache.hadoop.hive.ql.exec.MoveTask.execute(MoveTask.java:313)
        at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:214)
        at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:100)
        at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1976)
        at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1689)
        at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1421)
        at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1205)
        at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1200)
        at org.apache.hive.service.cli.operation.SQLOperation.runQuery(SQLOperation.java:237)
        at org.apache.hive.service.cli.operation.SQLOperation.access$300(SQLOperation.java:88)
        at org.apache.hive.service.cli.operation.SQLOperation$3$1.run(SQLOperation.java:293)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:415)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1796)
Getting log thread is interrupted, since query is done!
        at org.apache.hive.service.cli.operation.SQLOperation$3.run(SQLOperation.java:306)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ArrayIndexOutOfBoundsException
        at java.lang.System.arraycopy(Native Method)
        at java.util.ArrayList.removeRange(ArrayList.java:616)
        at java.util.ArrayList$SubList.removeRange(ArrayList.java:1021)
        at java.util.AbstractList.clear(AbstractList.java:234)
        at com.google.common.collect.Iterables.removeIfFromRandomAccessList(Iterables.java:213)
        at com.google.common.collect.Iterables.removeIf(Iterables.java:184)
        at org.apache.hadoop.hive.shims.Hadoop23Shims.removeBaseAclEntries(Hadoop23Shims.java:865)
        at org.apache.hadoop.hive.shims.Hadoop23Shims.setFullFileStatus(Hadoop23Shims.java:757)
        at org.apache.hadoop.hive.ql.metadata.Hive$3.call(Hive.java:2835)
        at org.apache.hadoop.hive.ql.metadata.Hive$3.call(Hive.java:2828)
        ... 4 more

ERROR : FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.MoveTask
{noformat}

Quick online search also shows some other instances like the one mentioned in http://stackoverflow.com/questions/38900333/get-concurrentmodificationexception-in-step-2-create-intermediate-flat-hive-tab

The issue seems to be coming from the below code :

{code}
if (aclEnabled) {
      aclStatus =  sourceStatus.getAclStatus();
      if (aclStatus != null) {
        LOG.trace(aclStatus.toString());
        aclEntries = aclStatus.getEntries();
        removeBaseAclEntries(aclEntries);

        //the ACL api's also expect the tradition user/group/other permission in the form
of ACL
        aclEntries.add(newAclEntry(AclEntryScope.ACCESS, AclEntryType.USER, sourcePerm.getUserAction()));
        aclEntries.add(newAclEntry(AclEntryScope.ACCESS, AclEntryType.GROUP, sourcePerm.getGroupAction()));
        aclEntries.add(newAclEntry(AclEntryScope.ACCESS, AclEntryType.OTHER, sourcePerm.getOtherAction()));
      }
    }
{code}

removeBaseAclEntries removes objects from {{List<AclEntry> aclEntries}} When HDFSUtils.setFullFileStatus()
method is called from multiple threads like from https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/metadata/Hive.java#L2835
it is possible that multiple threads try to modify the {{List<AclEntry> aclEntries}}
leading to concurrency issues. 

We should either move that block into a thread-safe region or call setFullFileStatus when
all the threads converge.



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