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From "Chris Goffinet (JIRA)" <>
Subject [jira] Created: (CASSANDRA-606) Compaction can't find files
Date Sat, 05 Dec 2009 23:35:20 GMT
Compaction can't find files

                 Key: CASSANDRA-606
             Project: Cassandra
          Issue Type: Bug
    Affects Versions: 0.5
            Reporter: Chris Goffinet
             Fix For: 0.5

We have been seeing issues with compaction running very often. We ran into this case when
I found out in one of our CFs we were inserting a high volume of columns. Our threshold for
memtable size flushes is 64MB but the MemtableObjectCountInMillions is 0.1 (we know this is
low and will increase). On average we are writing so much data that compaction kicks off reguarly.
And when we start trying to lookup data, we get lots of errors during compaction and get_slice
(since sometimes files don't get cleaned up). In every event that this has occurred, a -Filter
file was left behind. Never Data or Index.

ERROR [COMPACTION-POOL:1] 2009-12-05 15:04:47,412 (line
120) Error in executor futuretask
java.util.concurrent.ExecutionException: /mnt/var/cassandra/data/Digg/UserActivity-1243-Data.db
(No such file or directory)
        at java.util.concurrent.FutureTask$Sync.innerGet(
        at java.util.concurrent.FutureTask.get(
        at org.apache.cassandra.concurrent.DebuggableThreadPoolExecutor.afterExecute(
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(
        at java.util.concurrent.ThreadPoolExecutor$
Caused by: /mnt/var/cassandra/data/Digg/UserActivity-1243-Data.db
(No such file or directory)
        at Method)
        at org.apache.cassandra.db.ColumnFamilyStore.doFileCompaction(
        at org.apache.cassandra.db.ColumnFamilyStore.doFileCompaction(
        at org.apache.cassandra.db.ColumnFamilyStore.doCompaction(
        at org.apache.cassandra.db.CompactionManager$
        at org.apache.cassandra.db.CompactionManager$
        at java.util.concurrent.FutureTask$Sync.innerRun(
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(
        ... 2 more
 INFO [main] 2009-12-05 15:08:54,384 (line 156) Deleted /mnt/var/cassandra/data/Digg/UserActivity-1130-Data.db

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