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https://issues.apache.org/jira/browse/CASSANDRA-6298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13817670#comment-13817670
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Elias Ross commented on CASSANDRA-6298:
---------------------------------------
As it turns out, I was using symlinks. I had my last data directory pointing to
the same data directory.
lrwxrwxrwx 1 root root 6 Oct 30 18:37 data01 -> /data1
lrwxrwxrwx 1 root root 6 Oct 30 18:37 data02 -> /data2
lrwxrwxrwx 1 root root 6 Oct 30 18:37 data03 -> /data3
lrwxrwxrwx 1 root root 6 Oct 30 18:37 data04 -> /data4
lrwxrwxrwx 1 root root 6 Oct 30 18:37 data05 -> /data5
lrwxrwxrwx 1 root root 6 Nov 8 18:46 data06 -> /data5
As you can see (not so clearly) the last link data06 is pointing to data5.
Maybe Cassandra can do some basic checking (at startup) to check that the data
directories aren't repeated or pointing to the same location.
In any case, not a bug in the server.
> 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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