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From "Caleb Rackliffe (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-9669) If sstable flushes complete out of order, on restart we can fail to replay necessary commit log records
Date Sat, 14 May 2016 01:14:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15283354#comment-15283354
] 

Caleb Rackliffe edited comment on CASSANDRA-9669 at 5/14/16 1:14 AM:
---------------------------------------------------------------------

I've been able to reproduce this with a plain custom 2i that doesn't have a backing CF:

{noformat}
cqlsh> CREATE KEYSPACE truncation_test WITH replication = {'class': 'NetworkTopologyStrategy'
, 'DC1': '1'};
cqlsh> use truncation_test ;
cqlsh:truncation_test> CREATE TABLE simple_table (id text, value text, PRIMARY KEY (id));
cqlsh:truncation_test> CREATE CUSTOM INDEX value_index ON simple_table (value) USING 'c.d.b.util.DummyIndex';
cqlsh:truncation_test> INSERT INTO simple_table(id,value) VALUES('1','value1');
cqlsh:truncation_test> TRUNCATE simple_table;
OperationTimedOut: errors={}, last_host=127.0.0.1
{noformat}


was (Author: maedhroz):
I've been able to reproduce this with a plain custom 2i:

{noformat}
cqlsh> CREATE KEYSPACE truncation_test WITH replication = {'class': 'NetworkTopologyStrategy'
, 'DC1': '1'};
cqlsh> use truncation_test ;
cqlsh:truncation_test> CREATE TABLE simple_table (id text, value text, PRIMARY KEY (id));
cqlsh:truncation_test> CREATE CUSTOM INDEX value_index ON simple_table (value) USING 'c.d.b.util.DummyIndex';
cqlsh:truncation_test> INSERT INTO simple_table(id,value) VALUES('1','value1');
cqlsh:truncation_test> TRUNCATE simple_table;
OperationTimedOut: errors={}, last_host=127.0.0.1
{noformat}

> If sstable flushes complete out of order, on restart we can fail to replay necessary
commit log records
> -------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-9669
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9669
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local Write-Read Paths
>            Reporter: Benedict
>            Assignee: Benedict
>            Priority: Critical
>              Labels: correctness
>             Fix For: 2.2.7, 3.7, 3.0.7
>
>
> While {{postFlushExecutor}} ensures it never expires CL entries out-of-order, on restart
we simply take the maximum replay position of any sstable on disk, and ignore anything prior.

> It is quite possible for there to be two flushes triggered for a given table, and for
the second to finish first by virtue of containing a much smaller quantity of live data (or
perhaps the disk is just under less pressure). If we crash before the first sstable has been
written, then on restart the data it would have represented will disappear, since we will
not replay the CL records.
> This looks to be a bug present since time immemorial, and also seems pretty serious.



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