Home | About | Sematext search-lucene.com search-hadoop.com
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB
 Search Hadoop and all its subprojects:

Switch to Threaded View
Avro >> mail # user >> Avro Read with sync() {java.io.IOException: Invalid sync}


Copy link to this message
-
Re: Avro Read with sync() {java.io.IOException: Invalid sync}
Yes, Avro. A similar bug may exist in Avro's input buffering code.

Doug
On Dec 23, 2013 8:50 PM, "ÐΞ€ρ@Ҝ (๏̯͡๏)" <[EMAIL PROTECTED]> wrote:

> Hi Doug,
> You want me to raise a bug against Avro or Hadoop-Core. My guess is avro
> Regards,
> Deepak
>
>
> On Tue, Dec 24, 2013 at 12:10 AM, Doug Cutting <[EMAIL PROTECTED]> wrote:
>
>> This sounds like a bug.
>>
>> I wonder if it is similar to a related bug in Hadoop?
>>
>> https://issues.apache.org/jira/browse/HADOOP-9307
>>
>> If so, please file an issue in Jira.
>>
>> Doug
>>
>> On Sat, Dec 21, 2013 at 4:35 AM, ÐΞ€ρ@Ҝ (๏̯͡๏) <[EMAIL PROTECTED]>
>> wrote:
>> > Hello,
>> > I have a 340 MB avro data file that contains records sorted and
>> identified
>> > by unique id (duplicate records exists). At the beginning of every
>> unique
>> > record a synchronization point is created with DataFileWriter.sync(). (I
>> > cannot or do not want to save the sync points and i do not want to use
>> > SortedKeyValueFile as output format for M/R job)
>> >
>> > There are at-least 25k synchronization points in a 340 MB file.
>> >
>> > Ex:
>> > Marker1_RecordA1_RecordA2_RecordA3_Marker2_RecordB1_RecordB2
>> >
>> >
>> > As records are sorted, for efficient retrieval, binary search is
>> performed
>> > using the attached code.
>> >
>> > Most of the times the search is successful, at times the code throws the
>> > following exception
>> > ------
>> > org.apache.avro.AvroRuntimeException: java.io.IOException: Invalid
>> sync! at
>> > org.apache.avro.file.DataFileStream.hasNext(DataFileStream.java:210
>> > ------
>> >
>> >
>> >
>> > Questions
>> > 1) Is it ok to have 25k sycn points for 300 MB file ? Does it cost in
>> > performance while reading ?
>> > 2) I note down the position that was used to invoke
>> fileReader.sync(mid);.
>> > If i catch AvroRuntimeException, close and open the file and sync(mid)
>> i do
>> > not see exception. Why should Avro throw exception before and not later
>> ?
>> > 3) Is there a limit on number of times sync() is invoked ?
>> > 4) When sync(position) is invoked, are any 0 >= position <= file.size()
>> > valid ? If yes why do i see AvroRuntimeException (#2) ?
>> >
>> > Regards,
>> > Deepak
>> >
>>
>
>
>
> --
> Deepak
>
>
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB