[CASSANDRA-2598] incremental_backups and snapshot_before_compaction duplicate hard links

• Type: Bug
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 0.8.0

Environment

linux & jna

• Severity: Low
• Assignee: Jonathan Ellis
• Reporter: Michael Semb Wever

Authors

Jonathan Ellis

Reviewers

Michael Semb Wever

• Created: 03/May/11 20:19
• Updated: 16/Apr/19 09:33
• Resolved: 05/May/11 15:42

Description

See discussion @ http://thread.gmane.org/gmane.comp.db.cassandra.user/15933/

Enabling both incremental_backups and snapshot_before_compaction leads to the same hard links trying to be created.

This gives stacktraces like

java.io.IOError: java.io.IOException: Unable to create hard link from
/cassandra-data/<keyspace>/<cf>-f-3875-Data.db
to
/cassandra-data/<keyspace>/snapshots/compact-<cf>/<cf>-f-3875-Data.db
(errno 17)
at org.apache.cassandra.db.ColumnFamilyStore.snapshotWithoutFlush(ColumnFamilyStore.java:1629)
at org.apache.cassandra.db.ColumnFamilyStore.snapshot(ColumnFamilyStore.java:1654)
at org.apache.cassandra.db.Table.snapshot(Table.java:198)
at org.apache.cassandra.db.CompactionManager.doCompaction(CompactionManager.java:504)
at org.apache.cassandra.db.CompactionManager$1.call(CompactionManager.java:146)
at org.apache.cassandra.db.CompactionManager$1.call(CompactionManager.java:112)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.io.IOException: Unable to create hard link from
/cassandra-data/<keyspace>/<cf>-f-3875-Data.db
to
/cassandra-data/<keyspace>/snapshots/compact-<cf>/<cf>-f-3875-Data.db
(errno 17)
at org.apache.cassandra.utils.CLibrary.createHardLink(CLibrary.java:155)
at org.apache.cassandra.io.sstable.SSTableReader.createLinks(SSTableReader.java:713)
at org.apache.cassandra.db.ColumnFamilyStore.snapshotWithoutFlush(ColumnFamilyStore.java:1622)
... 10 more