Details
Description
ConcurrentModificationException error happens on NameNode occasionally.
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)
Attachments
Attachments
Issue Links
- is caused by
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HDFS-15159 Prevent adding same DN multiple times in PendingReconstructionBlocks
- Resolved