CODEWITHSUNDEEP
azureapache-sparkhadoophdfsazure-blob-storage
Blake B.
Blake B.

Reputation: 65

AzureBlobFileSystem FileNotFoundException when streaming from a Delta table on ADLS gen2

When I stream data from a Delta table hosted on Azure Datalake Storage (ADLS) Gen2, the stream works for a little bit before failing with the error below. The error says that the path doesn't exist, but I can see in the storage logs that files are successfully being written and read from that path before and after the error. It seems safe to say that the path does exist in Azure Storage, despite the exception.

For context:

Fixes I've tried:

  1. Increasing the batch execution interval from None to 10 seconds. After this, the query went from failing after ~15 minutes with the error below to failing after a little over an hour.
  2. Switching to a premium tier ADLS account (no effect).

I found one other person with this error, but no solution was provided: https://github.com/delta-io/delta/issues/932 since it was asked to the wrong audience. It seems that a simple repro can be made by reading and writing Spark streams to a delta table hosted on ADLS gen2, based on their Issue.

How can I pin down the root cause? Are there any Spark or ADLS settings I can change to mitigate this?

22/03/19 02:06:20 ERROR MicroBatchExecution: Query [id = 00f1d866-74a2-42f9-8fb6-c8d1a76e00a6, runId = 902f8480-4dc6-4a7d-aada-bfe3b660d288] terminated with error
java.io.FileNotFoundException: Operation failed: "The specified path does not exist.", 404, GET, https://example.dfs.core.windows.net/workspace?upn=false&resource=filesystem&maxResults=5000&directory=synapse/workspaces/example/warehouse/my_table/_delta_log&timeout=90&recursive=false, PathNotFound, "The specified path does not exist. RequestId:e8c6fb8e-101f-00cb-5c35-3b717e000000 Time:2022-03-19T02:06:20.8352277Z"
    at org.apache.hadoop.fs.azurebfs.AzureBlobFileSystem.checkException(AzureBlobFileSystem.java:1178)
    at org.apache.hadoop.fs.azurebfs.AzureBlobFileSystem.listStatus(AzureBlobFileSystem.java:408)
    at org.apache.spark.sql.delta.storage.HadoopFileSystemLogStore.listFrom(HadoopFileSystemLogStore.scala:69)
    at org.apache.spark.sql.delta.DeltaLog.getChanges(DeltaLog.scala:227)
    at org.apache.spark.sql.delta.sources.DeltaSource.filterAndIndexDeltaLogs$1(DeltaSource.scala:190)
    at org.apache.spark.sql.delta.sources.DeltaSource.getFileChanges(DeltaSource.scala:203)
    at org.apache.spark.sql.delta.sources.DeltaSourceBase.getFileChangesAndCreateDataFrame(DeltaSource.scala:117)
    at org.apache.spark.sql.delta.sources.DeltaSourceBase.getFileChangesAndCreateDataFrame$(DeltaSource.scala:112)
    at org.apache.spark.sql.delta.sources.DeltaSource.getFileChangesAndCreateDataFrame(DeltaSource.scala:144)
    at org.apache.spark.sql.delta.sources.DeltaSource.getBatch(DeltaSource.scala:385)
    at org.apache.spark.sql.execution.streaming.MicroBatchExecution.$anonfun$runBatch$3(MicroBatchExecution.scala:486)
    at scala.collection.TraversableLike.$anonfun$flatMap$1(TraversableLike.scala:245)
    at scala.collection.Iterator.foreach(Iterator.scala:941)
    at scala.collection.Iterator.foreach$(Iterator.scala:941)
    at scala.collection.AbstractIterator.foreach(Iterator.scala:1429)
    at scala.collection.IterableLike.foreach(IterableLike.scala:74)
    at scala.collection.IterableLike.foreach$(IterableLike.scala:73)
    at org.apache.spark.sql.execution.streaming.StreamProgress.foreach(StreamProgress.scala:27)
    at scala.collection.TraversableLike.flatMap(TraversableLike.scala:245)
    at scala.collection.TraversableLike.flatMap$(TraversableLike.scala:242)
    at org.apache.spark.sql.execution.streaming.StreamProgress.flatMap(StreamProgress.scala:27)
    at org.apache.spark.sql.execution.streaming.MicroBatchExecution.$anonfun$runBatch$2(MicroBatchExecution.scala:482)
    at org.apache.spark.sql.execution.streaming.ProgressReporter.reportTimeTaken(ProgressReporter.scala:357)
    at org.apache.spark.sql.execution.streaming.ProgressReporter.reportTimeTaken$(ProgressReporter.scala:355)
    at org.apache.spark.sql.execution.streaming.StreamExecution.reportTimeTaken(StreamExecution.scala:68)
    at org.apache.spark.sql.execution.streaming.MicroBatchExecution.runBatch(MicroBatchExecution.scala:482)
    at org.apache.spark.sql.execution.streaming.MicroBatchExecution.$anonfun$runActivatedStream$2(MicroBatchExecution.scala:226)
    at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
    at org.apache.spark.sql.execution.streaming.ProgressReporter.reportTimeTaken(ProgressReporter.scala:357)
    at org.apache.spark.sql.execution.streaming.ProgressReporter.reportTimeTaken$(ProgressReporter.scala:355)
    at org.apache.spark.sql.execution.streaming.StreamExecution.reportTimeTaken(StreamExecution.scala:68)
    at org.apache.spark.sql.execution.streaming.MicroBatchExecution.$anonfun$runActivatedStream$1(MicroBatchExecution.scala:194)
    at org.apache.spark.sql.execution.streaming.ProcessingTimeExecutor.execute(TriggerExecutor.scala:57)
    at org.apache.spark.sql.execution.streaming.MicroBatchExecution.runActivatedStream(MicroBatchExecution.scala:188)
    at org.apache.spark.sql.execution.streaming.StreamExecution.$anonfun$runStream$1(StreamExecution.scala:334)
    at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
    at org.apache.spark.sql.SparkSession.withActive(SparkSession.scala:775)
    at org.apache.spark.sql.execution.streaming.StreamExecution.org$apache$spark$sql$execution$streaming$StreamExecution$$runStream(StreamExecution.scala:317)
    at org.apache.spark.sql.execution.streaming.StreamExecution$$anon$1.run(StreamExecution.scala:244)
Caused by: Operation failed: "The specified path does not exist.", 404, GET, https://example.dfs.core.windows.net/workspace?upn=false&resource=filesystem&maxResults=5000&directory=synapse/workspaces/example/warehouse/my_table/_delta_log&timeout=90&recursive=false, PathNotFound, "The specified path does not exist. RequestId:e8c6fb8e-101f-00cb-5c35-3b717e000000 Time:2022-03-19T02:06:20.8352277Z"
    at org.apache.hadoop.fs.azurebfs.services.AbfsRestOperation.execute(AbfsRestOperation.java:207)
    at org.apache.hadoop.fs.azurebfs.services.AbfsClient.listPath(AbfsClient.java:231)
    at org.apache.hadoop.fs.azurebfs.AzureBlobFileSystemStore.listStatus(AzureBlobFileSystemStore.java:905)
    at org.apache.hadoop.fs.azurebfs.AzureBlobFileSystemStore.listStatus(AzureBlobFileSystemStore.java:876)
    at org.apache.hadoop.fs.azurebfs.AzureBlobFileSystemStore.listStatus(AzureBlobFileSystemStore.java:858)
    at org.apache.hadoop.fs.azurebfs.AzureBlobFileSystem.listStatus(AzureBlobFileSystem.java:405)
    ... 37 more

Upvotes: 0

Views: 1081

Answers (1)

kavya Saraboju
kavya Saraboju

Reputation: 10859

Please check with below points:

  • Please make sure to check if you have permissions. You will need the Storage Blob Data Contributor role on the storage account/ (contributor access to the data lake and the container) to work.
  • Try to restart the cluster by clearing the cache.
  • Recreating the cluster can be another troubleshooting step to ensure everything is done correctly.
  • The cause can be a network issue in Azure too: transient-faults
  • Try by changing the container’s access level to Anonymous access.
  • Also check with the path again in hdfs .

Otherwise the problem cause can be Having multiple jobs writing to the same cluster, and one is cleaning up while the other is setting up and getting mixed up

Note

  1. To avoid the error to some extent please make sure your jobs are not writing to the same table simultaneously.
  2. Work with the most recent version of spark you can work with.

References:

  1. Databricks error while trying to create delta table on ADLS Gen2 - Stack Overflow
  2. azure databricks - the Dataset/DataFrame - Stack Overflow
  3. python - FileNotFoundException- Stack Overflow

Upvotes: 0

Related Questions