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Daniel Ma updated HDFS-15796: ----------------------------- Description: ConcurrentModificationException error happens on NameNode occasionally. {code:java} 2021-01-23 20:21:18,107 | ERROR | RedundancyMonitor | RedundancyMonitor thread received Runtime exception. | BlockManager.java:4746 java.util.ConcurrentModificationException at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909) at java.util.ArrayList$Itr.next(ArrayList.java:859) at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReconstructionWorkForBlocks(BlockManager.java:1907) at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeBlockReconstructionWork(BlockManager.java:1859) at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeDatanodeWork(BlockManager.java:4862) at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$RedundancyMonitor.run(BlockManager.java:4729) at java.lang.Thread.run(Thread.java:748) {code} was: ConcurrentModificationException error happens on NameNode occasionally !file:///C:/Users/m00425105/AppData/Roaming/eSpace_Desktop/UserData/m00425105/imagefiles/10B02DC2-A9F0-4AE6-949B-92B8F1E9249A.png! > ConcurrentModificationException error happens on NameNode occasionally > ---------------------------------------------------------------------- > > Key: HDFS-15796 > URL: https://issues.apache.org/jira/browse/HDFS-15796 > Project: Hadoop HDFS > Issue Type: Bug > Components: hdfs > Affects Versions: 3.1.1 > Reporter: Daniel Ma > Priority: Critical > Fix For: 3.1.1 > > > ConcurrentModificationException error happens on NameNode occasionally. > > {code:java} > 2021-01-23 20:21:18,107 | ERROR | RedundancyMonitor | RedundancyMonitor > thread received Runtime exception. | BlockManager.java:4746 > java.util.ConcurrentModificationException > at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909) > at java.util.ArrayList$Itr.next(ArrayList.java:859) > at > org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReconstructionWorkForBlocks(BlockManager.java:1907) > at > org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeBlockReconstructionWork(BlockManager.java:1859) > at > org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeDatanodeWork(BlockManager.java:4862) > at > org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$RedundancyMonitor.run(BlockManager.java:4729) > at java.lang.Thread.run(Thread.java:748) > {code} > > -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org