Re: Unable to find clone for op Const 16-169

[Vincent Barat]

I have the exact same problem, and yes, I run my queries from Java 
concurrently. The issue is easier to reproduce in local mode than in 
MR mode (I never saw it in MR mode actually).

I've tried to add calls to pigServer.shutdown() to see if this can 
help, but the issue remains.

Ashutosh Chauhan a écrit :
Hi Bennie,

Are you using Pig Java API to run your queries? If so, are you trying to run
queries concurrently in multiple threads ?

Ashutosh

On Tue, Nov 3, 2009 at 11:00, Bennie Schut <bsc...@ebuddy.com> wrote:

From time to time I receive this error:

org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1002: Unable
to store alias uqusers11
       at org.apache.pig.PigServer.store(PigServer.java:536)
       at org.apache.pig.PigServer.store(PigServer.java:493)
       at

com.ebuddy.dwhmapreduce.pig.chatsessions.UniqueUsers.run(UniqueUsers.java:76)
       at

java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
       at

java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
       at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.RuntimeException: Unable to find clone for op Const
16-169( 1 )
       at
org.apache.pig.impl.logicalLayer.LogicalPlan.clone(LogicalPlan.java:139)
       at

org.apache.pig.impl.logicalLayer.LogicalPlanCloneHelper.<init>(LogicalPlanCloneHelper.java:63)
       at

org.apache.pig.impl.logicalLayer.LogicalPlanCloner.getClonedPlan(LogicalPlanCloner.java:45)
       at

org.apache.pig.impl.logicalLayer.parser.QueryParser.ForEachClause(QueryParser.java:3044)
       at

org.apache.pig.impl.logicalLayer.parser.QueryParser.BaseExpr(QueryParser.java:1328)
       at

org.apache.pig.impl.logicalLayer.parser.QueryParser.Expr(QueryParser.java:907)
       at

org.apache.pig.impl.logicalLayer.parser.QueryParser.Parse(QueryParser.java:696)
       at

org.apache.pig.impl.logicalLayer.LogicalPlanBuilder.parse(LogicalPlanBuilder.java:63)
       at org.apache.pig.PigServer$Graph.parseQuery(PigServer.java:1034)
       at org.apache.pig.PigServer$Graph.clone(PigServer.java:1077)
       at org.apache.pig.PigServer.clonePlan(PigServer.java:389)
       at org.apache.pig.PigServer.compileLp(PigServer.java:804)
       at org.apache.pig.PigServer.compileLp(PigServer.java:791)
       at org.apache.pig.PigServer.store(PigServer.java:509)
       ... 5 more

However running it a 2nd time it runs just fine. It's a little hard to
reproduce. I received this on a line like this:
uqusers11 = FOREACH uqusers10 GENERATE user_id, protocol, logincldr_id,
logintime_id;

but also sometimes on this:
uqusers6 = FOREACH uqusers5 GENERATE flatten($0), MIN(uqusers4.login) as
mindate;

so for now it mostly seems to happen on foreach statements (I'm
currently using pig trunk and hadoop 20.1)

Can anyone point me in the right direction on what to look at when
looking at errors like this.
Thanks,
Bennie.