[HUDI-1151] Fix NPE when no new data in kafka using HoodieDeltaStreamer

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.6.0
• Component/s: deltastreamer
• Labels: pull-request-available
• Assignee: wangxianghu#1
• Reporter: wangxianghu#1
• Created: 05/Aug/20 13:21
• Updated: 06/Aug/20 16:04
• Resolved: 06/Aug/20 16:04

Description

I get this NPE when using HoodieDeltaStreamer to etl kafka data to hudi table. the topic is newly created, and there is no data in the topic when the job is started

20/08/05 21:18:00 INFO helpers.KafkaOffsetGen: SourceLimit not configured, set numEvents to default value : 5000000
20/08/05 21:18:00 INFO sources.JsonKafkaSource: About to read 0 from Kafka for topic :hudi_test_callback
20/08/05 21:18:00 INFO deltastreamer.DeltaSync: No new data, source checkpoint has not changed. Nothing to commit. Old checkpoint=(Option{val=hudi_test_callback,0:0}). New Checkpoint=(hudi_test_callback,0:0)
20/08/05 21:18:00 ERROR deltastreamer.HoodieDeltaStreamer: Shutting down delta-sync due to exception
java.lang.NullPointerException
	at org.apache.hudi.utilities.deltastreamer.HoodieDeltaStreamer$DeltaSyncService.lambda$startService$0(HoodieDeltaStreamer.java:570)
	at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1590)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
20/08/05 21:18:00 INFO deltastreamer.HoodieDeltaStreamer: Delta Sync shutdown. Error ?true
20/08/05 21:18:00 ERROR async.AbstractAsyncService: Monitor noticed one or more threads failed. Requesting graceful shutdown of other threads
java.util.concurrent.ExecutionException: org.apache.hudi.exception.HoodieException
	at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
	at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1895)
	at org.apache.hudi.async.AbstractAsyncService.lambda$monitorThreads$0(AbstractAsyncService.java:136)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.hudi.exception.HoodieException
	at org.apache.hudi.utilities.deltastreamer.HoodieDeltaStreamer$DeltaSyncService.lambda$startService$0(HoodieDeltaStreamer.java:585)
	at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1590)
	... 3 more
Caused by: java.lang.NullPointerException
	at org.apache.hudi.utilities.deltastreamer.HoodieDeltaStreamer$DeltaSyncService.lambda$startService$0(HoodieDeltaStreamer.java:570)
	... 4 more
20/08/05 21:18:00 ERROR async.AbstractAsyncService: Service shutdown with error
java.util.concurrent.ExecutionException: org.apache.hudi.exception.HoodieException
	at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
	at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1895)
	at org.apache.hudi.async.AbstractAsyncService.waitForShutdown(AbstractAsyncService.java:72)
	at org.apache.hudi.utilities.deltastreamer.HoodieDeltaStreamer.lambda$sync$1(HoodieDeltaStreamer.java:152)
	at org.apache.hudi.common.util.Option.ifPresent(Option.java:96)
	at org.apache.hudi.utilities.deltastreamer.HoodieDeltaStreamer.sync(HoodieDeltaStreamer.java:149)
	at org.apache.hudi.utilities.deltastreamer.HoodieDeltaStreamer.main(HoodieDeltaStreamer.java:454)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.spark.deploy.yarn.ApplicationMaster$$anon$2.run(ApplicationMaster.scala:673)
Caused by: org.apache.hudi.exception.HoodieException
	at org.apache.hudi.utilities.deltastreamer.HoodieDeltaStreamer$DeltaSyncService.lambda$startService$0(HoodieDeltaStreamer.java:585)
	at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1590)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
	at org.apache.hudi.utilities.deltastreamer.HoodieDeltaStreamer$DeltaSyncService.lambda$startService$0(HoodieDeltaStreamer.java:570)
	... 4 more

Issue Links

• links to: GitHub Pull Request #1921