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From "Yong Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AVRO-1786) Strange IndexOutofBoundException in GenericDatumReader.readString
Date Tue, 26 Jan 2016 02:27:39 GMT

    [ https://issues.apache.org/jira/browse/AVRO-1786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15116522#comment-15116522
] 

Yong Zhang commented on AVRO-1786:
----------------------------------

Here is what I did, and here is the output result. I really don't know if this is an AVRO
issue, or hadoop MR issue.

I have this 900M avor file, and I know when this exception happened for my MR job, the reducer
is trying to deserialize a value with key = '3a410d00656911e3ac0bd4ae52986b44', which is the
list id in my schema.

Now if I change my mapper, only omit the three key value pairs: one of them is the above key,
and 2 more randomly pick up keys. To my surprise, I didn't get this exception in the reducer
of MR job.

If I remove the this filter, I will get this exception in MR job.

So with more key/value pairs in the intermediate result, I will get this exception consistently
for this key. But if I explicit pick up this avro record, and 2 other records, I cannot reproduce
this problem.

I can confirm the list id is unique in this AVRO file, and I also changed the ReducerContextImpl
of Hadoop 2.2.0 codebase, to dump the key when the value deserialize failed like following:

https://github.com/apache/hadoop/blob/release-2.2.0/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/task/ReduceContextImpl.java

line 145 ==> value = valueDeserializer.deserialize(value);

So right now, I am stuck to simplify the data, any idea how should I debug this issue? Thanks
to ==> try {   value = valueDeserializer.deserialize(value); } catch (RuntimeException
re) { System.out.println("key = " + key); throw re }


> Strange IndexOutofBoundException in GenericDatumReader.readString
> -----------------------------------------------------------------
>
>                 Key: AVRO-1786
>                 URL: https://issues.apache.org/jira/browse/AVRO-1786
>             Project: Avro
>          Issue Type: Bug
>          Components: java
>    Affects Versions: 1.7.4, 1.7.7
>         Environment: CentOS 6.5 Linux x64, 2.6.32-358.14.1.el6.x86_64
> Use IBM JVM:
> IBM J9 VM (build 2.7, JRE 1.7.0 Linux amd64-64 Compressed References 20140515_199835
(JIT enabled, AOT enabled)
>            Reporter: Yong Zhang
>
> Our production cluster is CENTOS 6.5 (2.6.32-358.14.1.el6.x86_64), running IBM BigInsight
V3.0.0.2. In Apache term, it is Hadoop 2.2.0 with MRV1(no yarn), and comes with AVRO 1.7.4,
running with IBM J9 VM (build 2.7, JRE 1.7.0 Linux amd64-64 Compressed References 20140515_199835
(JIT enabled, AOT enabled). Not sure if the JDK matters, but it is NOT Oracle JVM.
> We have a ETL implemented in a chain of MR jobs. In one MR job, it is going to merge
2 sets of AVRO data. Dataset1 is in HDFS location A, and Dataset2 is in HDFS location B, and
both contains the AVRO records binding to the same AVRO schema. The record contains an unique
id field, and a timestamp field. The MR job is to merge the records based on the ID, and use
the later timestamp record to replace previous timestamp record, and omit the final AVRO record
out. Very straightforward.
> Now we faced a problem that one reducer keeps failing with the following stacktrace on
JobTracker:
> {code}
> java.lang.IndexOutOfBoundsException
> 	at java.io.ByteArrayInputStream.read(ByteArrayInputStream.java:191)
> 	at java.io.DataInputStream.read(DataInputStream.java:160)
> 	at org.apache.avro.io.DirectBinaryDecoder.doReadBytes(DirectBinaryDecoder.java:184)
> 	at org.apache.avro.io.BinaryDecoder.readString(BinaryDecoder.java:263)
> 	at org.apache.avro.io.ValidatingDecoder.readString(ValidatingDecoder.java:107)
> 	at org.apache.avro.generic.GenericDatumReader.readString(GenericDatumReader.java:348)
> 	at org.apache.avro.reflect.ReflectDatumReader.readString(ReflectDatumReader.java:143)
> 	at org.apache.avro.reflect.ReflectDatumReader.readString(ReflectDatumReader.java:125)
> 	at org.apache.avro.reflect.ReflectDatumReader.readString(ReflectDatumReader.java:121)
> 	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:154)
> 	at org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:177)
> 	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:148)
> 	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:139)
> 	at org.apache.avro.hadoop.io.AvroDeserializer.deserialize(AvroDeserializer.java:108)
> 	at org.apache.avro.hadoop.io.AvroDeserializer.deserialize(AvroDeserializer.java:48)
> 	at org.apache.hadoop.mapreduce.task.ReduceContextImpl.nextKeyValue(ReduceContextImpl.java:142)
> 	at org.apache.hadoop.mapreduce.task.ReduceContextImpl.nextKey(ReduceContextImpl.java:117)
> 	at org.apache.hadoop.mapreduce.lib.reduce.WrappedReducer$Context.nextKey(WrappedReducer.java:297)
> 	at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:165)
> 	at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:652)
> 	at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:420)
> 	at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
> 	at java.security.AccessController.doPrivileged(AccessController.java:366)
> 	at javax.security.auth.Subject.doAs(Subject.java:572)
> 	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1502)
> 	at org.apache.hadoop.mapred.Child.main(Child.java:249)
> {code}
> Here is the my Mapper and Reducer methods:
> Mapper:
> public void map(AvroKey<SpecificRecord> key, NullWritable value, Context context)
throws IOException, InterruptedException 
> Reducer:
> protected void reduce(CustomPartitionKeyClass key, Iterable<AvroValue<SpecificRecord>>
values, Context context) throws IOException, InterruptedException 
> What bother me are the following facts:
> 1) All the mappers finish without error
> 2) Most of the reducers finish without error, but one reducer keeps failing with the
above error.
> 3) It looks like caused by the data? But keep in mind that all the avro records passed
the mapper side, but failed in one reducer. 
> 4) From the stacktrace, it looks like our reducer code was NOT invoked yet, but failed
before that. So my guess is that all the AVRO records pass through the mapper side, but AVRO
complains the intermediate result generated by the one mapper? In my understanding, that will
be a Sequence file generated by Hadoop, and value part will be the AVRO bytes. Is the above
error meaning that AVRO cannot deserialize the value part from the sequence file?
> 5) Our ETL run fine for more than one year, but suddenly got this error starting from
one day, and kept getting this problem after that. 
> 6) If it helps, here is the schema for the avro record:
> {code}
> {
>     "namespace" : "company name",
>     "type" : "record",
>     "name" : "Lists",
>     "fields" : [
>         {"name" : "account_id", "type" : "long"},
>         {"name" : "list_id", "type" : "string"},
>         {"name" : "sequence_id", "type" : ["int", "null"]} ,
>         {"name" : "name", "type" : ["string", "null"]},
>         {"name" : "state", "type" : ["string", "null"]},
>         {"name" : "description", "type" : ["string", "null"]},
>         {"name" : "dynamic_filtered_list", "type" : ["int", "null"]},
>         {"name" : "filter_criteria", "type" : ["string", "null"]},
>         {"name" : "created_at", "type" : ["long", "null"]},
>         {"name" : "updated_at", "type" : ["long", "null"]},
>         {"name" : "deleted_at", "type" : ["long", "null"]},
>         {"name" : "favorite", "type" : ["int", "null"]},
>         {"name" : "delta", "type" : ["boolean", "null"]},
>         {
>             "name" : "list_memberships", "type" : {
>                 "type" : "array", "items" : {
>                     "name" : "ListMembership", "type" : "record",
>                     "fields" : [
>                         {"name" : "channel_id", "type" : "string"},
>                         {"name" : "created_at", "type" : ["long", "null"]},
>                         {"name" : "created_source", "type" : ["string", "null"]},
>                         {"name" : "deleted_at", "type" : ["long", "null"]},
>                         {"name" : "sequence_id", "type" : ["long", "null"]}
>                     ]
>                 }
>             }
>         }
>     ]
> }
> {code}



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