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Akira AJISAKA updated HDFS-6945: -------------------------------- Attachment: HDFS-6945.2.patch Updated the patch to avoid ConcurrentModificationException when removing a value from TreeMap. > excessReplicateMap can increase infinitely > ------------------------------------------ > > Key: HDFS-6945 > URL: https://issues.apache.org/jira/browse/HDFS-6945 > Project: Hadoop HDFS > Issue Type: Bug > Affects Versions: 2.5.0 > Reporter: Akira AJISAKA > Assignee: Akira AJISAKA > Priority: Critical > Labels: metrics > Attachments: HDFS-6945.2.patch, HDFS-6945.patch > > > I'm seeing ExcessBlocks metric increases to more than 300K in some clusters, > however, there are no over-replicated blocks (confirmed by fsck). > After a further research, I noticed when deleting a block, BlockManager does > not remove the block from excessReplicateMap or decrement excessBlocksCount. > Usually the metric is decremented when processing block report, however, if > the block has been deleted, BlockManager does not remove the block from > excessReplicateMap or decrement the metric. > That way the metric and excessReplicateMap can increase infinitely (i.e. > memory leak can occur). -- This message was sent by Atlassian JIRA (v6.3.4#6332)