[HDFS-13412] filesystem will throw out-of-bounds access for webhdfs using DirectoryListing

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.0.0
• Fix Version/s: 3.0.0
• Component/s: webhdfs
• Target Version/s: 3.0.0
• Assignee: Unassigned
• Reporter: Shen, Neal
• Created: 08/Apr/18 08:35
• Updated: 08/Apr/18 08:35

Description

In a big directory, there are a lot of entries; so we use LISTSTATUS_BATCH over webhdfs;

and if the first batch is returned and preparing to query with startAfter but the left entries are deleted from the directory.

for this scenario,the hadoop client will throw out-of-bounds access at line 'return (T)entries.getEntries()[i++];'

@Override
@SuppressWarnings("unchecked")
public T next() throws IOException {
Preconditions.checkState(hasNext(), "No more items in iterator");
if (i == entries.getEntries().length)

{ fetchMore(); }

return (T)entries.getEntries()[i++];
}

here is the exception stack:

 

java.lang.ArrayIndexOutOfBoundsException: 0
at org.apache.hadoop.fs.FileSystem$DirListingIterator.next(FileSystem.java:2120)
at org.apache.hadoop.fs.FileSystem$DirListingIterator.next(FileSystem.java:2084)
at org.apache.hadoop.hdfs.web.TestWebHdfsListBatch$1.run(TestWebHdfsListBatch.java:149)
at org.apache.hadoop.hdfs.web.TestWebHdfsListBatch$1.run(TestWebHdfsListBatch.java:135)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1962)
at org.apache.hadoop.hdfs.web.TestWebHdfsListBatch.testLargeDirectory(TestWebHdfsListBatch.java:135)
at org.apache.hadoop.hdfs.web.TestWebHdfsListBatch.main(TestWebHdfsListBatch.java:102)
2018-03-30 22:53:00,731 DEBUG util.ShutdownHookManager: ShutdownHookManger complete shutdown.