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https://issues.apache.org/jira/browse/CASSANDRA-9862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14651597#comment-14651597
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Mark Curtis edited comment on CASSANDRA-9862 at 8/3/15 9:18 AM:
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Ok so we could add the following for more debugging would this level be ok or
produce too much noise?
{code}
log4j.logger.org.apache.cassandra.db.compaction=DEBUG
{code}
was (Author: mark curtis):
Would there be a way of adding some more debugging to the compaction classes so
we could get some more information in the logs perhaps when this problem occurs?
> Missing sstable files seen some time after the same file is logged as being
> part of a compaction
> ------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-9862
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9862
> Project: Cassandra
> Issue Type: Bug
> Reporter: Mark Curtis
> Assignee: Yuki Morishita
>
> The system will sometimes see a file not found exception in a given node’s
> logs. This is seen after the same file appears in a compaction statement
> either earlier on in the logs. I found the following events of potential
> interest:
> I pulled out the missing files using this command:
> {code}
> grep "Caused by: java.io.FileNotFoundException:" * | awk '{print $4}' | sort
> -u > files-to-search
> {code}
> Using the following file as an example:
> my_keyspace-my_table-jb-2085190-Data.db
> File is created from a flush
> system.log.10
> {code}
> 7549 INFO [FlushWriter:1] 2015-06-03 12:25:31,857 Memtable.java (line
> 395) Completed flushing
> /raid0/cassandra/data/my_keyspace/my_table/my_keyspace-my_table-jb-2085190-Data.d
> 7549 b (66804 bytes) for commitlog position
> ReplayPosition(segmentId=1433333700832, position=2479196)
> {code}
> Next it appears in a compaction
> system.log.10
> {code}
> 8758 INFO [CompactionExecutor:5] 2015-06-03 12:25:37,209
> CompactionTask.java (line 115) Compacting
> [SSTableReader(path='/raid0/cassandra/data/my_keyspace/my_table/my_keyspace-data_viewer
>
> 8758 _mapping-jb-2084993-Data.db'),
> SSTableReader(path='/raid0/cassandra/data/my_keyspace/my_table/my_keyspace-my_table-jb-2085164-Data.db'),
> SSTableReader(path='/raid0/cassand
> 8758
> ra/data/my_keyspace/my_table/my_keyspace-my_table-jb-2085190-Data.db'),
> SSTableReader(path='/raid0/cassandra/data/my_keyspace/my_table/my_keyspace-data_viewer_m
> ...<truncated>...
> {code}
> The next time we see the file its in file not found exceptions
> {code}
> system.log.9
> 53811 java.lang.RuntimeException: java.io.FileNotFoundException:
> /raid0/cassandra/data/my_keyspace/my_table/my_keyspace-my_table-jb-2085190-Data.db
> (No such file or directory)
> {code}
> So going back to compaction executor 5 in system.log.10
> {code}
> 9102 INFO [CompactionExecutor:5] 2015-06-03 12:25:38,684
> ColumnFamilyStore.java (line 794) Enqueuing flush of
> Memtable-compactions_in_progress@1431151640(0/0 serialized/live bytes, 1 ops)
> ...
> 9107 INFO [CompactionExecutor:5] 2015-06-03 12:25:38,701
> CompactionTask.java (line 287) Compacted 32 sstables to
> [/raid0/cassandra/data/my_keyspace/my_table/my_keyspace-data_viewer_mappi
> 9107 ng-jb-2085196,]. 1,970,986 bytes to 1,880,866 (~95% of original) in
> 1,492ms = 1.202234MB/s. 13,576 total partitions merged to 11,243. Partition
> merge counts were {1:9379, 2:1474, 3:324, 4:54 9107 , 5:11, 6:1, }
> 9108 INFO [CompactionExecutor:5] 2015-06-03 12:25:38,702
> ColumnFamilyStore.java (line 794) Enqueuing flush of
> Memtable-compactions_in_progress@493376470(357/3570 serialized/live bytes, 16
> ops)
> ...
> 9111 INFO [CompactionExecutor:5] 2015-06-03 12:25:38,717
> CompactionTask.java (line 115) Compacting
> [SSTableReader(path='/raid0/cassandra/data/my_keyspace/my_table/my_keyspace-data_viewer
>
> 9111 _mapping-jb-2085182-Data.db'),
> SSTableReader(path='/raid0/cassandra/data/my_keyspace/my_table/my_keyspace-my_table-jb-2085192-Data.db'),
> SSTableReader(path='/raid0/cassand
> 9111
> ra/data/my_keyspace/my_table/my_keyspace-my_table-jb-2085175-Data.db'),
> SSTableReader(path='/raid0/cassandra/data/my_keyspace/my_table/my_keyspace-data_viewer_m
>
> 9111 apping-jb-2085196-Data.db'),
> SSTableReader(path='/raid0/cassandra/data/my_keyspace/my_table/my_keyspace-my_table-jb-2085194-Data.db'),
> SSTableReader(path='/raid0/cassandra
> 9111
> /data/my_keyspace/my_table/my_keyspace-my_table-jb-2085191-Data.db'),
> SSTableReader(path='/raid0/cassandra/data/my_keyspace/my_table/my_keyspace-data_viewer_map
>
> 9111 ping-jb-2085193-Data.db'),
> SSTableReader(path='/raid0/cassandra/data/my_keyspace/my_table/my_keyspace-my_table-jb-2085195-Data.db'),
> SSTableReader(path='/raid0/cassandra/d
> 9111 ata/my_keyspace/my_table/my_keyspace-my_table-jb-2084985-Data.db'),
> SSTableReader(path='/raid0/cassandra/data/my_keyspace/my_table/my_keyspace-data_viewer_mappi
>
> 9111 ng-jb-2085114-Data.db'),
> SSTableReader(path='/raid0/cassandra/data/my_keyspace/my_table/my_keyspace-my_table-jb-2084901-Data.db')]
> 9112 ERROR [CompactionExecutor:5] 2015-06-03 12:25:38,718
> CassandraDaemon.java (line 199) Exception in thread
> Thread[CompactionExecutor:5,1,main]
> 9113 java.lang.RuntimeException: java.io.FileNotFoundException:
> /raid0/cassandra/data/my_keyspace/my_table/my_keyspace-my_table-jb-2084901-Data.db
> (No such file or directory)
> {code}
> So could it be that because the thread "CompactionExecutor:5" hit an
> exception in line 9113 that the compaction in 8758 didn't complete?
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