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https://issues.apache.org/jira/browse/SOLR-11381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16795319#comment-16795319
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Kevin Risden commented on SOLR-11381:
-------------------------------------
I think I fixed this test recently looking at HDFS failures. I'll have a patch
shortly.
> HdfsDirectoryFactory throws NPE on cleanup because file system has been closed
> ------------------------------------------------------------------------------
>
> Key: SOLR-11381
> URL: https://issues.apache.org/jira/browse/SOLR-11381
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Hadoop Integration, hdfs
> Reporter: Shalin Shekhar Mangar
> Priority: Trivial
> Fix For: 8.1, master (9.0)
>
>
> I saw this happening on tests related to autoscaling. The old directory clean
> up is triggered on core close in a separate thread. This can cause a race
> condition where the filesystem is closed before the cleanup starts running.
> Then a NPE is thrown and cleanup fails.
> Fixing the NPE is simple but I think this is a real bug where old directories
> can be left around on HDFS. I don't know enough about HDFS to investigate
> further. Leaving it here for interested people to pitch in.
> {code}
> 105029 ERROR
> (OldIndexDirectoryCleanupThreadForCore-control_collection_shard1_replica_n1)
> [n:127.0.0.1:58542_ c:control_collection s:shard1 r:core_node2
> x:control_collection_shard1_replica_n1] o.a.s.c.HdfsDirectoryFactory Error
> checking for old index directories to clean-up.
> java.io.IOException: Filesystem closed
> at org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:808)
> at org.apache.hadoop.hdfs.DFSClient.listPaths(DFSClient.java:2083)
> at org.apache.hadoop.hdfs.DFSClient.listPaths(DFSClient.java:2069)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.listStatusInternal(DistributedFileSystem.java:791)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.access$700(DistributedFileSystem.java:106)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:853)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:849)
> at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.listStatus(DistributedFileSystem.java:860)
> at org.apache.hadoop.fs.FileSystem.listStatus(FileSystem.java:1517)
> at org.apache.hadoop.fs.FileSystem.listStatus(FileSystem.java:1557)
> at
> org.apache.solr.core.HdfsDirectoryFactory.cleanupOldIndexDirectories(HdfsDirectoryFactory.java:540)
> at
> org.apache.solr.core.SolrCore.lambda$cleanupOldIndexDirectories$32(SolrCore.java:3019)
> at java.lang.Thread.run(Thread.java:745)
> 105030 ERROR
> (OldIndexDirectoryCleanupThreadForCore-control_collection_shard1_replica_n1)
> [n:127.0.0.1:58542_ c:control_collection s:shard1 r:core_node2
> x:control_collection_shard1_replica_n1] o.a.s.c.SolrCore Failed to cleanup
> old index directories for core control_collection_shard1_replica_n1
> java.lang.NullPointerException
> at
> org.apache.solr.core.HdfsDirectoryFactory.cleanupOldIndexDirectories(HdfsDirectoryFactory.java:558)
> at
> org.apache.solr.core.SolrCore.lambda$cleanupOldIndexDirectories$32(SolrCore.java:3019)
> at java.lang.Thread.run(Thread.java:745)
> {code}
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