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https://issues.apache.org/jira/browse/HIVE-27135?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Denys Kuzmenko resolved HIVE-27135.
-----------------------------------
Fix Version/s: 4.0.0
Resolution: Fixed
> AcidUtils#getHdfsDirSnapshots() throws FNFE when a directory is removed in
> HDFS
> -------------------------------------------------------------------------------
>
> Key: HIVE-27135
> URL: https://issues.apache.org/jira/browse/HIVE-27135
> Project: Hive
> Issue Type: Bug
> Reporter: Dayakar M
> Assignee: Dayakar M
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 7.5h
> Remaining Estimate: 0h
>
> AcidUtils#getHdfsDirSnapshots() throws FileNotFoundException when a directory
> is removed in HDFS while fetching HDFS Snapshots.
> Below testcode can be used to reproduce this issue.
> {code:java}
> @Test
> public void
> testShouldNotThrowFNFEWhenHiveStagingDirectoryIsRemovedWhileFetchingHDFSSnapshots()
> throws Exception {
> MockFileSystem fs = new MockFileSystem(new HiveConf(),
> new MockFile("mock:/tbl/part1/.hive-staging_dir/-ext-10002", 500, new
> byte[0]),
> new MockFile("mock:/tbl/part2/.hive-staging_dir", 500, new byte[0]),
> new MockFile("mock:/tbl/part1/_tmp_space.db", 500, new byte[0]),
> new MockFile("mock:/tbl/part1/delta_1_1/bucket-0000-0000", 500, new
> byte[0]));
> Path path = new MockPath(fs, "/tbl");
> Path stageDir = new MockPath(fs, "mock:/tbl/part1/.hive-staging_dir");
> FileSystem mockFs = spy(fs);
> Mockito.doThrow(new
> FileNotFoundException("")).when(mockFs).listLocatedStatus(eq(stageDir));
> try {
> Map<Path, AcidUtils.HdfsDirSnapshot> hdfsDirSnapshots =
> AcidUtils.getHdfsDirSnapshots(mockFs, path);
> Assert.assertEquals(1, hdfsDirSnapshots.size());
> }
> catch (FileNotFoundException fnf) {
> fail("Should not throw FileNotFoundException when a directory is
> removed while fetching HDFSSnapshots");
> }
> }{code}
> This issue got fixed as a part of HIVE-26481 but here its not fixed
> completely.
> [Here|https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/io/AcidUtils.java#L1541]
> FileUtils.listFiles() API which returns a RemoteIterator<LocatedFileStatus>.
> So while iterating over, it checks if it is a directory and recursive listing
> then it will try to list files from that directory but if that directory is
> removed by other thread/task then it throws FileNotFoundException. Here the
> directory which got removed is the .staging directory which needs to be
> excluded through by using passed filter.
>
> So here we can use same logic written in
> _org.apache.hadoop.hive.ql.io.AcidUtils#getHdfsDirSnapshotsForCleaner()_ API
> to avoid FileNotFoundException.
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