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From "Yuki Morishita (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8616) sstable tools may result in commit log segments be written
Date Fri, 19 Feb 2016 17:25:18 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15154523#comment-15154523
] 

Yuki Morishita commented on CASSANDRA-8616:
-------------------------------------------

Bad news. My approach didn't work.

There is one point that tries to access commit log: offline tools like sstablescrub tries
to delete data from system.sstable_activity after scrubbing SSTable. This causes access to
commit log and since we are trying to disable, the tool hangs at [here|https://github.com/apache/cassandra/blob/cassandra-2.1.13/src/java/org/apache/cassandra/db/commitlog/CommitLogSegmentManager.java#L271].
Previously I stated that many offline tools cannot run with {{Client.setClientMode(true)}},
so reading from SSTableReader tracks sstable activity even we are ofline.

Probably we should consider rewriting tools so that they never use ColumnFamilyStore.

> sstable tools may result in commit log segments be written
> ----------------------------------------------------------
>
>                 Key: CASSANDRA-8616
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8616
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tools
>            Reporter: Tyler Hobbs
>            Assignee: Yuki Morishita
>             Fix For: 2.1.x, 2.2.x, 3.0.x, 3.x
>
>         Attachments: 8161-2.0.txt
>
>
> There was a report of sstable2json causing commitlog segments to be written out when
run.  I haven't attempted to reproduce this yet, so that's all I know for now.  Since sstable2json
loads the conf and schema, I'm thinking that it may inadvertently be triggering the commitlog
code.
> sstablescrub, sstableverify, and other sstable tools have the same issue.



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