[
https://issues.apache.org/jira/browse/AVRO-1093?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Catalin Alexandru Zamfir updated AVRO-1093:
-------------------------------------------
Description:
We're doing this:
{code}
// Check
if (!(objRecordsBuffer
.containsKey (objShardPath))) {
// Set
objRecordsBuffer.put (objShardPath,
new ByteBufferOutputStream ());
}
// Set
Encoder objEncoder = EncoderFactory.get ()
.binaryEncoder (objRecordsBuffer
.get (objShardPath), null);
// Write
objGenericDatumWriter.write (objRecordConstructor.build (),
objEncoder);
objEncoder.flush ();
// For
for (ByteBuffer objRecord : objRecordsBuffer
.get (objKey).getBufferList ()) {
// Append
objRecordWriter.appendEncoded
(objRecord);
}
// Erase
objRecordWriter.flush ();
objRecordWriter.close ();
{code}
It writes the data to HDFS. Reading it back outputs the follosing exception:
{code}
Caused by: org.apache.avro.AvroRuntimeException: java.io.IOException: Block
read partially, the data may be corrupt
at org.apache.avro.file.DataFileStream.hasNext(DataFileStream.java:210)
at
net.RnD.FileUtils.TimestampedReader.hasNext(TimestampedReader.java:113)
at net.RnD.Hadoop.App.read1BAvros(App.java:131)
at net.RnD.Hadoop.App.executeCode(App.java:534)
at net.RnD.Hadoop.App.main(App.java:453)
... 5 more
Caused by: java.io.IOException: Block read partially, the data may be corrupt
at org.apache.avro.file.DataFileStream.hasNext(DataFileStream.java:194)
... 9 more
{code}
The objRecordWriter is an instance of DataFileWriter.create or
DataFileWriter.appendto (SeekableInput). In relation to AVRO-1090 ticket.
Instead of having big "hashmaps" in memory, we've decided to serialize the data
in "byte buffers" in memory. Because it's faster. Using "appendEncoded"
although seems to write something to HDFS, reading the data back, exposes this
error.
Help would be appreciated. I've looked @ appendEncoded in DataFileWriter but
could not figure out if it's our job to add a sync marker, or does
appendEncoded does that for us.
Must the "ByteBuffer" we give, be the length of one exact record?
Examples and documentation on this method is welcomed.
Files are getting created because:
{code}
-rw-r--r-- 3 root supergroup 124901360 2012-05-17 10:09
/Streams/Timestamped/Threads/2012/05/17/10/09/Shard.avro
-rw-r--r-- 3 root supergroup 124845625 2012-05-17 10:10
/Streams/Timestamped/Threads/2012/05/17/10/10/Shard.avro
-rw-r--r-- 3 root supergroup 62378307 2012-05-17 10:11
/Streams/Timestamped/Threads/2012/05/17/10/11/Shard.avro
{code}
was:
We're doing this:
{code}
// Check
if (!(objRecordsBuffer
.containsKey (objShardPath))) {
// Set
objRecordsBuffer.put (objShardPath,
new ByteBufferOutputStream ());
}
// Set
Encoder objEncoder = EncoderFactory.get ()
.binaryEncoder (objRecordsBuffer
.get (objShardPath), null);
// Write
objGenericDatumWriter.write (objRecordConstructor.build (),
objEncoder);
objEncoder.flush ();
// For
for (ByteBuffer objRecord : objRecordsBuffer
.get (objKey).getBufferList ()) {
// Append
objRecordWriter.appendEncoded
(objRecord);
}
// Erase
objRecordWriter.flush ();
objRecordWriter.close ();
{code}
It writes the data to HDFS. Reading it back outputs the follosing exception:
{code}
Caused by: org.apache.avro.AvroRuntimeException: java.io.IOException: Block
read partially, the data may be corrupt
at org.apache.avro.file.DataFileStream.hasNext(DataFileStream.java:210)
at
net.RnD.FileUtils.TimestampedReader.hasNext(TimestampedReader.java:113)
at net.RnD.Hadoop.App.read1BAvros(App.java:131)
at net.RnD.Hadoop.App.executeCode(App.java:534)
at net.RnD.Hadoop.App.main(App.java:453)
... 5 more
Caused by: java.io.IOException: Block read partially, the data may be corrupt
at org.apache.avro.file.DataFileStream.hasNext(DataFileStream.java:194)
... 9 more
{code}
The objRecordWriter is an instance of DataFileWriter.create or
DataFileWriter.appendto (SeekableInput). In relation to AVRO-1090 ticket.
Instead of having big "hashmaps" in memory, we've decided to serialize the data
in "byte buffers" in memory. Because it's faster. Using "appendEncoded"
although seems to write something to HDFS, reading the data back, exposes this
error.
Help would be appreciated. I've looked @ appendEncoded in DataFileWriter but
could not figure out if it's our job to add a sync marker, or does
appendEncoded does that for us.
Must the "ByteBuffer" we give, be the length of one exact record?
Examples and documentation on this method is welcomed.
> DataFileWriter, appendEncoded causes AvroRuntimeException when read back
> ------------------------------------------------------------------------
>
> Key: AVRO-1093
> URL: https://issues.apache.org/jira/browse/AVRO-1093
> Project: Avro
> Issue Type: Bug
> Affects Versions: 1.6.3, 1.7.0
> Reporter: Catalin Alexandru Zamfir
>
> We're doing this:
> {code}
> // Check
> if (!(objRecordsBuffer
> .containsKey (objShardPath))) {
> // Set
> objRecordsBuffer.put (objShardPath,
> new ByteBufferOutputStream ());
> }
> // Set
> Encoder objEncoder = EncoderFactory.get ()
> .binaryEncoder (objRecordsBuffer
> .get (objShardPath), null);
> // Write
> objGenericDatumWriter.write (objRecordConstructor.build (),
> objEncoder);
> objEncoder.flush ();
> // For
> for (ByteBuffer objRecord : objRecordsBuffer
> .get (objKey).getBufferList ()) {
> // Append
> objRecordWriter.appendEncoded
> (objRecord);
> }
> // Erase
> objRecordWriter.flush ();
> objRecordWriter.close ();
> {code}
> It writes the data to HDFS. Reading it back outputs the follosing exception:
> {code}
> Caused by: org.apache.avro.AvroRuntimeException: java.io.IOException: Block
> read partially, the data may be corrupt
> at
> org.apache.avro.file.DataFileStream.hasNext(DataFileStream.java:210)
> at
> net.RnD.FileUtils.TimestampedReader.hasNext(TimestampedReader.java:113)
> at net.RnD.Hadoop.App.read1BAvros(App.java:131)
> at net.RnD.Hadoop.App.executeCode(App.java:534)
> at net.RnD.Hadoop.App.main(App.java:453)
> ... 5 more
> Caused by: java.io.IOException: Block read partially, the data may be corrupt
> at
> org.apache.avro.file.DataFileStream.hasNext(DataFileStream.java:194)
> ... 9 more
> {code}
> The objRecordWriter is an instance of DataFileWriter.create or
> DataFileWriter.appendto (SeekableInput). In relation to AVRO-1090 ticket.
> Instead of having big "hashmaps" in memory, we've decided to serialize the
> data in "byte buffers" in memory. Because it's faster. Using "appendEncoded"
> although seems to write something to HDFS, reading the data back, exposes
> this error.
> Help would be appreciated. I've looked @ appendEncoded in DataFileWriter but
> could not figure out if it's our job to add a sync marker, or does
> appendEncoded does that for us.
> Must the "ByteBuffer" we give, be the length of one exact record?
> Examples and documentation on this method is welcomed.
> Files are getting created because:
> {code}
> -rw-r--r-- 3 root supergroup 124901360 2012-05-17 10:09
> /Streams/Timestamped/Threads/2012/05/17/10/09/Shard.avro
> -rw-r--r-- 3 root supergroup 124845625 2012-05-17 10:10
> /Streams/Timestamped/Threads/2012/05/17/10/10/Shard.avro
> -rw-r--r-- 3 root supergroup 62378307 2012-05-17 10:11
> /Streams/Timestamped/Threads/2012/05/17/10/11/Shard.avro
> {code}
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