Eli Collins created HDFS-4058:
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Summary: DirectoryScanner may fail with IOOB if the directory
scanning threads return out of volume order
Key: HDFS-4058
URL: https://issues.apache.org/jira/browse/HDFS-4058
Project: Hadoop HDFS
Issue Type: Improvement
Components: data-node
Affects Versions: 2.0.0-alpha
Reporter: Eli Collins
Assignee: Eli Collins
Attachments: hdfs-4058.txt
The DirectoryScanner may fail with an IOOB if the directory scanning threads
return out of volume order (ie volume scanner #3 returns before volume scanner
#2). This is because it's using an ArrayList and ArrayList#add(index, element)
throws IOOB if idx >= size, and size is only increased as elements are added,
therefore adds have to be done in index order. Since we know the size when we
create the ArrayList let's just use an array (perhaps an ArrayList was used
originally because someone thought array creation called the default
constructor?).
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