Leon Gao created HDFS-16268:
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Summary: Balancer stuck when moving striped blocks due to NPE
Key: HDFS-16268
URL: https://issues.apache.org/jira/browse/HDFS-16268
Project: Hadoop HDFS
Issue Type: Bug
Components: balancer & mover, erasure-coding
Affects Versions: 3.2.2
Reporter: Leon Gao
Assignee: Leon Gao
{code:java}
21/10/11 06:11:26 WARN balancer.Dispatcher: Dispatcher thread failed
java.lang.NullPointerException
at
org.apache.hadoop.hdfs.server.balancer.Dispatcher$PendingMove.markMovedIfGoodBlock(Dispatcher.java:289)
at
org.apache.hadoop.hdfs.server.balancer.Dispatcher$PendingMove.chooseBlockAndProxy(Dispatcher.java:272)
at
org.apache.hadoop.hdfs.server.balancer.Dispatcher$PendingMove.access$2500(Dispatcher.java:236)
at
org.apache.hadoop.hdfs.server.balancer.Dispatcher$Source.chooseNextMove(Dispatcher.java:899)
at
org.apache.hadoop.hdfs.server.balancer.Dispatcher$Source.dispatchBlocks(Dispatcher.java:958)
at
org.apache.hadoop.hdfs.server.balancer.Dispatcher$Source.access$3300(Dispatcher.java:757)
at
org.apache.hadoop.hdfs.server.balancer.Dispatcher$2.run(Dispatcher.java:1226)
at
java.util.concurrent.Executors$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)
{code}
Due to NPE in the middle, there will be pending moves left in the queue so
balancer will stuck forever.
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