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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: IOException: Unable to create hard link ... /snapshots/ ... (errno 17)
Date Tue, 03 May 2011 18:52:21 GMT
you should probably look to see what errno 17 means for the link
system call on your system.

On Tue, May 3, 2011 at 9:52 AM, Mck <mck@apache.org> wrote:
> Running a 3 node cluster with cassandra-0.8.0-beta1
>
> I'm seeing the first node logging many (thousands) times lines like
>
>
> Caused by: java.io.IOException: Unable to create hard link
> from /iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_1299479381593068337-f-5504-Data.db
to /iad/finn/countstatistics/cassandra-data/countstatisticsCount/snapshots/compact-thrift_no_finntech_countstats_count_Count_1299479381593068337/thrift_no_finntech_countstats_count_Count_1299479381593068337-f-5504-Data.db
(errno 17)
>
>
> This seems to happen for all column families (including system).
> It happens a lot during startup.
>
> The hardlinks do exist. Stopping, deleting the hardlinks, and starting
> again does not help.
>
> But i haven't seen it once on the other nodes...
>
> ~mck
>
>
> ps the stacktrace
>
>
> java.io.IOError: java.io.IOException: Unable to create hard link from /iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_1299479381593068337-f-3875-Data.db
to /iad/finn/countstatistics/cassandra-data/countstatisticsCount/snapshots/compact-thrift_no_finntech_countstats_count_Count_1299479381593068337/thrift_no_finntech_countstats_count_Count_1299479381593068337-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 /iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_1299479381593068337-f-3875-Data.db
to /iad/finn/countstatistics/cassandra-data/countstatisticsCount/snapshots/compact-thrift_no_finntech_countstats_count_Count_1299479381593068337/thrift_no_finntech_countstats_count_Count_1299479381593068337-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
>
>
>
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com

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