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From "Sharvanath Pathak (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-10534) CompressionInfo not being fsynced on close
Date Thu, 15 Oct 2015 14:29:05 GMT
Sharvanath Pathak created CASSANDRA-10534:
---------------------------------------------

             Summary: 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


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 checked for fsync calls using strace, and found them happening for all but the following
components: CompressionInfo, TOC.txt and digest.sha1. All seem tolerable but the  CompressionInfo
seem tolerable. Also a quick look through the code and did not revealed any fsync calls. Moreover,
I suspect the commit  4e95953f29d89a441dfe06d3f0393ed7dd8586df (https://github.com/apache/cassandra/commit/4e95953f29d89a441dfe06d3f0393ed7dd8586df#diff-b7e48a1398e39a936c11d0397d5d1966R344)
to have caused the regression. Which removed the 
{noformat}
 getChannel().force(true);
{noformat}
from CompressionMetadata.Writer.close.



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