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https://issues.apache.org/jira/browse/CASSANDRA-6298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13816890#comment-13816890
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Robert Coli commented on CASSANDRA-6298:
----------------------------------------

Per OP on cassandra-user ML, multiple data directories are in use, so this 
potentially relates to multiple data dir support. All filesystems are ext3.

multiple data dirs defined as follows :

{noformat}
data_file_directories:
- /data01/rhq/data
- /data02/rhq/data
- /data03/rhq/data
- /data04/rhq/data
- /data05/rhq/data
- /data06/rhq/data
{noformat}

> Duplicate hard links; Cannot take snapshot (1.2)
> ------------------------------------------------
>
>                 Key: CASSANDRA-6298
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6298
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: Linux, multiple data directories, Java 6
>            Reporter: Elias Ross
>
> I've been seeing this. It could be related to CASSANDRA-6093 in some way. The 
> version is 1.2.9.
> Caused by: java.lang.RuntimeException: Tried to create duplicate hard link to 
> /data05/rhq/data/system/NodeIdInfo/snapshots/1383588365276/system-NodeIdInfo-ic-
> 1-TOC.txt
>         at 
> org.apache.cassandra.io.util.FileUtils.createHardLink(FileUtils.java:70)
>         at 
> org.apache.cassandra.io.sstable.SSTableReader.createLinks(SSTableReader.java:1081)
>         at 
> org.apache.cassandra.db.ColumnFamilyStore.snapshotWithoutFlush(ColumnFamilyStore.java:1567)
>         at 
> org.apache.cassandra.db.ColumnFamilyStore.snapshot(ColumnFamilyStore.java:1612)
>         at org.apache.cassandra.db.Table.snapshot(Table.java:194)
>         at 
> org.apache.cassandra.service.StorageService.takeSnapshot(StorageService.java:2203)
> $ ./nodetool -p 7299 snapshot
> Requested creating snapshot for: all keyspaces 
> Exception in thread "main" java.lang.RuntimeException: Tried to create 
> duplicate hard link to 
> /data06/rhq/data/system/NodeIdInfo/snapshots/1383602745114/system-NodeIdInfo-ic-1-Summary.db
> data:
> /data02/rhq/data/system/peers/snapshots
> /data02/rhq/data/system/peers/snapshots/1383602745114
> /data02/rhq/data/system/peers/snapshots/1383602745114/system-peers-ic-33-Data.db
> /data02/rhq/data/system/peers/snapshots/1383602745114/system-peers-ic-33-Statistics.db
> /data02/rhq/data/system/peers/snapshots/1383602745114/system-peers-ic-33-TOC.txt
> /data02/rhq/data/system/peers/snapshots/1383602745114/system-peers-ic-33-Summary.db
> /data02/rhq/data/system/peers/snapshots/1383602745114/system-peers-ic-32-Filter.db
> /data02/rhq/data/system/peers/snapshots/1383602745114/system-peers-ic-32-Summary.db
> /data02/rhq/data/system/peers/snapshots/1383602745114/system-peers-ic-32-Data.db
> /data02/rhq/data/system/peers/snapshots/1383602745114/system-peers-ic-33-Digest.sha1
> /data02/rhq/data/system/peers/snapshots/1383602745114/system-peers-ic-32-TOC.txt
> /data02/rhq/data/system/peers/snapshots/1383602745114/system-peers-ic-33-Index.db
> /data02/rhq/data/system/peers/snapshots/1383602745114/system-peers-ic-32-Index.db
> /data02/rhq/data/system/peers/snapshots/1383602745114/system-peers-ic-32-Digest.sha1
> /data02/rhq/data/system/peers/snapshots/1383602745114/system-peers-ic-32-Statistics.db
> /data02/rhq/data/system/peers/snapshots/1383602745114/system-peers-ic-33-Filter.db
> /data02/rhq/data/system/local/snapshots
> /data02/rhq/data/system/local/snapshots/1383602745114
> /data02/rhq/data/system/local/snapshots/1383602745114/system-local-ic-58-TOC.txt
> /data02/rhq/data/system/local/snapshots/1383602745114/system-local-ic-58-Digest.sha1
> /data02/rhq/data/system/local/snapshots/1383602745114/system-local-ic-58-Index.db
> /data02/rhq/data/system/local/snapshots/1383602745114/system-local-ic-58-Summary.db
> /data02/rhq/data/system/local/snapshots/1383602745114/system-local-ic-58-Statistics.db
> /data02/rhq/data/system/local/snapshots/1383602745114/system-local-ic-58-Filter.db
> /data02/rhq/data/system/local/snapshots/1383602745114/system-local-ic-58-Data.db
> /data03/rhq/data/system/local/snapshots
> /data03/rhq/data/system/local/snapshots/1383602745114
> /data03/rhq/data/system/local/snapshots/1383602745114/system-local-ic-57-Index.db
> /data03/rhq/data/system/local/snapshots/1383602745114/system-local-ic-57-Statistics.db
> /data03/rhq/data/system/local/snapshots/1383602745114/system-local-ic-57-Digest.sha1
> /data03/rhq/data/system/local/snapshots/1383602745114/system-local-ic-57-TOC.txt
> /data03/rhq/data/system/local/snapshots/1383602745114/system-local-ic-57-Summary.db
> /data03/rhq/data/system/local/snapshots/1383602745114/system-local-ic-57-Filter.db
> /data03/rhq/data/system/local/snapshots/1383602745114/system-local-ic-57-Data.db
> /data05/rhq/data/system/NodeIdInfo/snapshots
> /data05/rhq/data/system/NodeIdInfo/snapshots/1383602745114
> /data05/rhq/data/system/NodeIdInfo/snapshots/1383602745114/system-NodeIdInfo-ic-1-Data.db
> /data05/rhq/data/system/NodeIdInfo/snapshots/1383602745114/system-NodeIdInfo-ic-1-Statistics.db
> /data05/rhq/data/system/NodeIdInfo/snapshots/1383602745114/system-NodeIdInfo-ic-1-Digest.sha1
> /data05/rhq/data/system/NodeIdInfo/snapshots/1383602745114/system-NodeIdInfo-ic-1-Filter.db
> /data05/rhq/data/system/NodeIdInfo/snapshots/1383602745114/system-NodeIdInfo-ic-1-TOC.txt
> /data05/rhq/data/system/NodeIdInfo/snapshots/1383602745114/system-NodeIdInfo-ic-1-Index.db
> /data05/rhq/data/system/NodeIdInfo/snapshots/1383602745114/system-NodeIdInfo-ic-1-Summary.db
> /data06/rhq/data/system/NodeIdInfo/snapshots
> /data06/rhq/data/system/NodeIdInfo/snapshots/1383602745114
> /data06/rhq/data/system/NodeIdInfo/snapshots/1383602745114/system-NodeIdInfo-ic-1-Data.db
> /data06/rhq/data/system/NodeIdInfo/snapshots/1383602745114/system-NodeIdInfo-ic-1-Statistics.db
> /data06/rhq/data/system/NodeIdInfo/snapshots/1383602745114/system-NodeIdInfo-ic-1-Digest.sha1
> /data06/rhq/data/system/NodeIdInfo/snapshots/1383602745114/system-NodeIdInfo-ic-1-Filter.db
> /data06/rhq/data/system/NodeIdInfo/snapshots/1383602745114/system-NodeIdInfo-ic-1-TOC.txt
> /data06/rhq/data/system/NodeIdInfo/snapshots/1383602745114/system-NodeIdInfo-ic-1-Index.db
> /data06/rhq/data/system/NodeIdInfo/snapshots/1383602745114/system-NodeIdInfo-ic-1-Summary.db



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