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From "Gary Dusbabek (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-1715) More schema migration race conditions
Date Mon, 15 Nov 2010 23:19:21 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-1715?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary Dusbabek updated CASSANDRA-1715:
-------------------------------------

    Attachment:     (was: v2-0007-updateColumnFamily-uses-reload-remove-unneccesary-stru.txt)

> More schema migration race conditions
> -------------------------------------
>
>                 Key: CASSANDRA-1715
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1715
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.7 beta 1
>            Reporter: Jonathan Ellis
>            Assignee: Gary Dusbabek
>            Priority: Critical
>             Fix For: 0.7.0
>
>
> Related to CASSANDRA-1631.
> This is still a bug with schema updates to an existing CF, since reloadCf is doing a
unload/init cycle. So flushing + compaction is an issue there as well. Here is a stacktrace
from during an index creation where it stubbed its toe on an incomplete sstable from an in-progress
compaction (path names anonymized):
> {code}
> INFO [CompactionExecutor:1] 2010-11-02 16:31:00,553 CompactionManager.java (line 224)
Compacting [org.apache.cassandra.io.sstable.SSTableReader(path='Standard1-e-6-Data.db'),org.apache.cassandra.io.sstable.SSTableReader(path='Standard1-e-7-Data.db'),org.apache.cassandra.io.sstable.SSTableReader(path='Standard1-e-8-Data.db'),org.apache.cassandra.io.sstable.SSTableReader(path='Standard1-e-9-Data.db')]
> ...
> ERROR [MigrationStage:1] 2010-11-02 16:31:10,939 ColumnFamilyStore.java (line 244) Corrupt
sstable Standard1-tmp-e-10-<>=[Data.db, Index.db]; skipped
> java.io.EOFException
>         at org.apache.cassandra.utils.FBUtilities.skipShortByteArray(FBUtilities.java:308)
>         at org.apache.cassandra.io.sstable.SSTable.estimateRowsFromIndex(SSTable.java:231)
>         at org.apache.cassandra.io.sstable.SSTableReader.load(SSTableReader.java:286)
>         at org.apache.cassandra.io.sstable.SSTableReader.open(SSTableReader.java:202)
>         at org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:235)
>         at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:443)
>         at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:431)
>         at org.apache.cassandra.db.Table.initCf(Table.java:335)
>         at org.apache.cassandra.db.Table.reloadCf(Table.java:343)
>         at org.apache.cassandra.db.migration.UpdateColumnFamily.applyModels(UpdateColumnFamily.java:89)
>         at org.apache.cassandra.db.migration.Migration.apply(Migration.java:158)
>         at org.apache.cassandra.thrift.CassandraServer$2.call(CassandraServer.java:672)
>         at java.util.concurrent.FutureTask$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:619)
> ...
>  INFO [CompactionExecutor:1] 2010-11-02 16:31:31,970 CompactionManager.java (line 303)
Compacted to Standard1-tmp-e-10-Data.db.  213,657,983 to 213,657,983 (~100% of original) bytes
for 626,563 keys.  Time: 31,416ms.
> {code}
> There is also a race between schema modification and streaming.

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