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https://issues.apache.org/jira/browse/CASSANDRA-14013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17656028#comment-17656028
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Stefan Miklosovic edited comment on CASSANDRA-14013 at 1/9/23 10:47 AM:
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The problem is that when we are trying to get a descriptor for a legacy
sstable, the test is going to find the first file in the dir and it might
happen that it will return ".txt" file. But
Descriptor.LEGACY_SSTABLE_DIR_PATTERN is ending on ".db". We should just do
this [https://github.com/pauloricardomg/cassandra/pull/2]
I am running the build for trunk with that PR included here
[https://ci-cassandra.apache.org/view/patches/job/Cassandra-devbranch/2166/]
was (Author: smiklosovic):
The problem is that when we are trying to get a descriptor for a legacy
sstable, the test is going to find a first file in the dir and it might happen
that it will return ".txt" file. But Descriptor.LEGACY_SSTABLE_DIR_PATTERN is
ending on ".db". We should just do this
[https://github.com/pauloricardomg/cassandra/pull/2]
I am running the build for trunk with that PR included here
[https://ci-cassandra.apache.org/view/patches/job/Cassandra-devbranch/2166/]
> Data loss in snapshots keyspace after service restart
> -----------------------------------------------------
>
> Key: CASSANDRA-14013
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14013
> Project: Cassandra
> Issue Type: Bug
> Components: Legacy/Core, Local/Snapshots
> Reporter: Gregor Uhlenheuer
> Assignee: Stefan Miklosovic
> Priority: Normal
> Fix For: 4.0.x, 4.1.x, 4.x
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> I am posting this bug in hope to discover the stupid mistake I am doing
> because I can't imagine a reasonable answer for the behavior I see right now
> :-)
> In short words, I do observe data loss in a keyspace called *snapshots* after
> restarting the Cassandra service. Say I do have 1000 records in a table
> called *snapshots.test_idx* then after restart the table has less entries or
> is even empty.
> My kind of "mysterious" observation is that it happens only in a keyspace
> called *snapshots*...
> h3. Steps to reproduce
> These steps to reproduce show the described behavior in "most" attempts (not
> every single time though).
> {code}
> # create keyspace
> CREATE KEYSPACE snapshots WITH replication = {'class': 'SimpleStrategy',
> 'replication_factor': 1};
> # create table
> CREATE TABLE snapshots.test_idx (key text, seqno bigint, primary key(key));
> # insert some test data
> INSERT INTO snapshots.test_idx (key,seqno) values ('key1', 1);
> ...
> INSERT INTO snapshots.test_idx (key,seqno) values ('key1000', 1000);
> # count entries
> SELECT count(*) FROM snapshots.test_idx;
> 1000
> # restart service
> kill <cassandra-pid>
> cassandra -f
> # count entries
> SELECT count(*) FROM snapshots.test_idx;
> 0
> {code}
> I hope someone can point me to the obvious mistake I am doing :-)
> This happened to me using both Cassandra 3.9 and 3.11.0
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