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https://issues.apache.org/jira/browse/HDFS-9334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14979765#comment-14979765
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He Xiaoqiao commented on HDFS-9334:
-----------------------------------
the following scenario may occur ArrayIndexOutOfBoundsException:
1. more than one replica of Block located at same DN, then part circular are
included in Double linked list,
2. delete one replica when DN hb/other,
3. delete File of Block belong to when do editlog tailer .
not find proof through log yet.
[~walter.k.su] FYI.
> NameNode crash caused by ArrayIndexOutOfBoundsException
> -------------------------------------------------------
>
> Key: HDFS-9334
> URL: https://issues.apache.org/jira/browse/HDFS-9334
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.4.1
> Reporter: He Xiaoqiao
> Assignee: He Xiaoqiao
>
> when remove block from list of blocks by method {{listRemove}} in
> {{BlockInfo.java}}, and {{findStorageInfo(storage)}} return -1 means not
> found, {{prev.setNext(prev.findStorageInfo(storage), next)}} or
> {{next.setPrevious(next.findStorageInfo(storage), prev)}} could throw
> ArrayIndexOutOfBoundsException cause NameNode Process exit.
> {code:title=BlockInfo.java}
> BlockInfo listRemove(BlockInfo head, DatanodeStorageInfo storage) {
> if(head == null)
> return null;
> int dnIndex = this.findStorageInfo(storage);
> if(dnIndex < 0) // this block is not on the data-node list
> return head;
> BlockInfo next = this.getNext(dnIndex);
> BlockInfo prev = this.getPrevious(dnIndex);
> this.setNext(dnIndex, null);
> this.setPrevious(dnIndex, null);
> if(prev != null)
> prev.setNext(prev.findStorageInfo(storage), next);
> if(next != null)
> next.setPrevious(next.findStorageInfo(storage), prev);
> if(this == head) // removing the head
> head = next;
> return head;
> }
> {code}
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