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From "jean carlo rivera ura (JIRA)" <j...@apache.org>
Subject [jira] [Created] (TEZ-3451) select count(*) fails with tez over cassandra
Date Thu, 29 Sep 2016 09:21:20 GMT
jean carlo rivera ura created TEZ-3451:
------------------------------------------

             Summary: select count(*) fails with tez over cassandra
                 Key: TEZ-3451
                 URL: https://issues.apache.org/jira/browse/TEZ-3451
             Project: Apache Tez
          Issue Type: Bug
    Affects Versions: 0.7.0
            Reporter: jean carlo rivera ura


Hello,

We have a cluster with nodes having cassandra and hadoop (hortonworks 2.3.2) and we have tez
as our engine by default.

I have a table in cassandra, and I use the driver hive-cassandra to do selects over it. This
is the table

{code:sql}
CREATE TABLE table1 ( campaign_id text, sid text, name text, ts timestamp, PRIMARY KEY (campaign_id,
sid) ) WITH CLUSTERING ORDER BY (sid ASC)
{code}
And I have only 3 partitions

campaign_id |   sid  |  name  |  ts
-------------------------------------
45sqdqs        | sqsd |  dea    | NULL
QSHJKA         | sqsd |  dea    | NULL
45s-qs           | sqsd |  dea    | NULL

At the moment to do a "select count(*)" over table using hive like that (tez is our engine
by default)
{code} hive -e "select count(*) from table1;" {code}

I got this error:

{code}
Status: Failed
Vertex failed, vertexName=Map 1, 
vertexId=vertex_1474275943985_0179_1_00, diagnostics=[Task failed, 
taskId=task_1474275943985_0179_1_00_000001, diagnostics=[TaskAttempt 0 
failed, info=[Error: Failure while running 
task:java.lang.RuntimeException: 
org.apache.tez.dag.api.TezUncheckedException: Expected length: 12416 
actual length: 9223372036854775711
   at org.apache.hadoop.hive.ql.exec.tez.TezProcessor.initializeAndRunProcessor(TezProcessor.java:171)
   at org.apache.hadoop.hive.ql.exec.tez.TezProcessor.run(TezProcessor.java:137)
   at org.apache.tez.runtime.LogicalIOProcessorRuntimeTask.run(LogicalIOProcessorRuntimeTask.java:344)
   at org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable$1.run(TezTaskRunner.java:179)
   at org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable$1.run(TezTaskRunner.java:171)
   at java.security.AccessController.doPrivileged(Native Method)
   at javax.security.auth.Subject.doAs(Subject.java:422)
   at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
   at org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable.callInternal(TezTaskRunner.java:171)
   at org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable.callInternal(TezTaskRunner.java:167)
   at org.apache.tez.common.CallableWithNdc.call(CallableWithNdc.java:36)
   at java.util.concurrent.FutureTask.run(FutureTask.java:266)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
   at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.tez.dag.api.TezUncheckedException: Expected length: 12416 actual length:
9223372036854775711
   at org.apache.hadoop.mapred.split.TezGroupedSplit.readFields(TezGroupedSplit.java:128)
   at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:71)
   at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:42)
   at org.apache.tez.mapreduce.hadoop.MRInputHelpers.createOldFormatSplitFromUserPayload(MRInputHelpers.java:177)
   at org.apache.tez.mapreduce.lib.MRInputUtils.getOldSplitDetailsFromEvent(MRInputUtils.java:136)
   at org.apache.tez.mapreduce.input.MRInput.initFromEventInternal(MRInput.java:643)
   at org.apache.tez.mapreduce.input.MRInput.initFromEvent(MRInput.java:621)
   at org.apache.tez.mapreduce.input.MRInputLegacy.checkAndAwaitRecordReaderInitialization(MRInputLegacy.java:145)
   at org.apache.tez.mapreduce.input.MRInputLegacy.init(MRInputLegacy.java:109)
   at org.apache.hadoop.hive.ql.exec.tez.MapRecordProcessor.getMRInput(MapRecordProcessor.java:390)
   at org.apache.hadoop.hive.ql.exec.tez.MapRecordProcessor.init(MapRecordProcessor.java:128)
   at org.apache.hadoop.hive.ql.exec.tez.TezProcessor.initializeAndRunProcessor(TezProcessor.java:147)
   ... 14 more
{code}

So far I understand, in readfields we are getting more data that we are expecting. But considering
the size of the table( only 3 records), I dont think the data is a problem. 

Another thing to add is that if I do  a "select *", it works perfectly fine with tez :) .
Using the engine mp, select count(*) and select * work fine as well.

We are using hortonworks version 2.3.2



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