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https://issues.apache.org/jira/browse/CASSANDRA-10534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15002883#comment-15002883
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Ariel Weisberg commented on CASSANDRA-10534:
--------------------------------------------
Ok. +1 LGTM.
It looks like the other components all use SequentialWriter which if you use
the transaction stuff does the right thing without any extra work. Except we
don't use the transaction proxy for the other metadata components instead we
call finish manually which goes through the transaction proxy.
I can't quite tell since it looks like it can throw and cause other code not to
execute.
> CompressionInfo not being fsynced on close
> ------------------------------------------
>
> Key: CASSANDRA-10534
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10534
> Project: Cassandra
> Issue Type: Bug
> Reporter: Sharvanath Pathak
> Assignee: Stefania
> Fix For: 2.1.x
>
>
> I was seeing SSTable corruption due to a CompressionInfo.db file of size 0,
> this happened multiple times in our testing with hard node reboots. After
> some investigation it seems like these file is not being fsynced, and that
> can potentially lead to data corruption. I am working with version 2.1.9.
> I checked for fsync calls using strace, and found them happening for all but
> the following components: CompressionInfo, TOC.txt and digest.sha1. All of
> these but the CompressionInfo seem tolerable. Also a quick look through the
> code did not reveal any fsync calls. Moreover, I suspect the commit
> 4e95953f29d89a441dfe06d3f0393ed7dd8586df
> (https://github.com/apache/cassandra/commit/4e95953f29d89a441dfe06d3f0393ed7dd8586df#diff-b7e48a1398e39a936c11d0397d5d1966R344)
> has caused the regression, which removed the line
> {noformat}
> getChannel().force(true);
> {noformat}
> from CompressionMetadata.Writer.close.
> Following is the trace I saw in system.log:
> {noformat}
> INFO [SSTableBatchOpen:1] 2015-09-29 19:24:39,170 SSTableReader.java:478 -
> Opening
> /var/lib/cassandra/data/system/compactions_in_progress-55080ab05d9c388690a4acb25fe1f77b/system-compactions_in_progress-ka-13368
> (79 bytes)
> ERROR [SSTableBatchOpen:1] 2015-09-29 19:24:39,177 FileUtils.java:447 -
> Exiting forcefully due to file system exception on startup, disk failure
> policy "stop"
> org.apache.cassandra.io.sstable.CorruptSSTableException: java.io.EOFException
> at
> org.apache.cassandra.io.compress.CompressionMetadata.<init>(CompressionMetadata.java:131)
> ~[apache-cassandra-2.1.9.jar:2.1.9]
> at
> org.apache.cassandra.io.compress.CompressionMetadata.create(CompressionMetadata.java:85)
> ~[apache-cassandra-2.1.9.jar:2.1.9]
> at
> org.apache.cassandra.io.util.CompressedSegmentedFile$Builder.metadata(CompressedSegmentedFile.java:79)
> ~[apache-cassandra-2.1.9.jar:2.1.9]
> at
> org.apache.cassandra.io.util.CompressedPoolingSegmentedFile$Builder.complete(CompressedPoolingSegmentedFile.java:72)
> ~[apache-cassandra-2.1.9.jar:2.1.9]
> at
> org.apache.cassandra.io.util.SegmentedFile$Builder.complete(SegmentedFile.java:168)
> ~[apache-cassandra-2.1.9.jar:2.1.9]
> at
> org.apache.cassandra.io.sstable.SSTableReader.load(SSTableReader.java:752)
> ~[apache-cassandra-2.1.9.jar:2.1.9]
> at
> org.apache.cassandra.io.sstable.SSTableReader.load(SSTableReader.java:703)
> ~[apache-cassandra-2.1.9.jar:2.1.9]
> at
> org.apache.cassandra.io.sstable.SSTableReader.open(SSTableReader.java:491)
> ~[apache-cassandra-2.1.9.jar:2.1.9]
> at
> org.apache.cassandra.io.sstable.SSTableReader.open(SSTableReader.java:387)
> ~[apache-cassandra-2.1.9.jar:2.1.9]
> at
> org.apache.cassandra.io.sstable.SSTableReader$4.run(SSTableReader.java:534)
> ~[apache-cassandra-2.1.9.jar:2.1.9]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> [na:1.7.0_80]
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> [na:1.7.0_80]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> [na:1.7.0_80]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> [na:1.7.0_80]
> at java.lang.Thread.run(Thread.java:745) [na:1.7.0_80]
> Caused by: java.io.EOFException: null
> at
> java.io.DataInputStream.readUnsignedShort(DataInputStream.java:340)
> ~[na:1.7.0_80]
> at java.io.DataInputStream.readUTF(DataInputStream.java:589)
> ~[na:1.7.0_80]
> at java.io.DataInputStream.readUTF(DataInputStream.java:564)
> ~[na:1.7.0_80]
> at
> org.apache.cassandra.io.compress.CompressionMetadata.<init>(CompressionMetadata.java:106)
> ~[apache-cassandra-2.1.9.jar:2.1.9]
> ... 14 common frames omitted
> {noformat}
> Following is the result of ls on the data directory of a corrupted SSTable
> after the hard reboot:
> {noformat}
> $ ls -l
> /var/lib/cassandra/data/system/sstable_activity-5a1ff267ace03f128563cfae6103c65e/
> total 60
> -rw-r--r-- 1 cassandra cassandra 0 Oct 15 09:31
> system-sstable_activity-ka-1-CompressionInfo.db
> -rw-r--r-- 1 cassandra cassandra 9740 Oct 15 09:31
> system-sstable_activity-ka-1-Data.db
> -rw-r--r-- 1 cassandra cassandra 0 Oct 15 09:31
> system-sstable_activity-ka-1-Digest.sha1
> -rw-r--r-- 1 cassandra cassandra 880 Oct 15 09:31
> system-sstable_activity-ka-1-Filter.db
> -rw-r--r-- 1 cassandra cassandra 34000 Oct 15 09:31
> system-sstable_activity-ka-1-Index.db
> -rw-r--r-- 1 cassandra cassandra 7338 Oct 15 09:31
> system-sstable_activity-ka-1-Statistics.db
> -rw-r--r-- 1 cassandra cassandra 0 Oct 15 09:31
> system-sstable_activity-ka-1-TOC.txt
> {noformat}
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