venkata yerubandi created PARQUET-1176:
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Summary: Occasional corruption of parquet files , parquet writer
might not be calling ParquetFileWriter->end()
Key: PARQUET-1176
URL: https://issues.apache.org/jira/browse/PARQUET-1176
Project: Parquet
Issue Type: Bug
Affects Versions: 1.7.0
Environment: | +--- org.apache.parquet:parquet-column:1.7.0
| | +--- org.apache.parquet:parquet-common:1.7.0
| | +--- org.apache.parquet:parquet-encoding:1.7.0
| | | +--- org.apache.parquet:parquet-common:1.7.0
| | | +--- org.apache.parquet:parquet-generator:1.7.0
| | | | \--- org.apache.parquet:parquet-common:1.7.0
| +--- org.apache.parquet:parquet-hadoop:1.7.0
| | +--- org.apache.parquet:parquet-column:1.7.0 (*)
| | +--- org.apache.parquet:parquet-format:2.3.0-incubating
| | +--- org.apache.parquet:parquet-jackson:1.7.0
Reporter: venkata yerubandi
We have a high volume streaming service which works most of the time . But off
late we have been observing that some of the parquet files written out by write
flow are getting corrupted. This is manifested in our reading flow with the
following exception
Caused by: java.lang.RuntimeException:
hdfs://Ingest/ingest/jobs/2017-11-30/00-05/part4139 is not a Parquet file.
expected magic number at tail [80, 65, 82, 49] but found [-28, -126, 1, 1]
at
org.apache.parquet.hadoop.ParquetFileReader.readFooter(ParquetFileReader.java:422)
at
org.apache.parquet.hadoop.ParquetFileReader.readFooter(ParquetFileReader.java:385)
at
org.apache.parquet.hadoop.ParquetRecordReader.initializeInternalReader(ParquetRecordReader.java:157)
at
org.apache.parquet.hadoop.ParquetRecordReader.initialize(ParquetRecordReader.java:140)
at
org.apache.spark.rdd.SqlNewHadoopRDD$$anon$1.<init>(SqlNewHadoopRDD.scala:180)
at org.apache.spark.rdd.SqlNewHadoopRDD.compute(SqlNewHadoopRDD.scala:126)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:270)
at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:270)
at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:270)
at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:73)
at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41)
at org.apache.spark.scheduler.Task.run(Task.scala:89)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:227)
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)```
After looking at the code , i can see that one of the possible causes is/are
1] footer not being serialized in the writer due to end not being called
but we are not seeing any exceptions on the writer.
2] data size - does data size has impact ? There will be cases when row group
sizes will be huge as it is activity data of a user
We are using default parquet block size and hdfs block size . Other than
upgrading to the latest version and re-test , what are the options we have to
debug a issue like this
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