[jira] [Commented] (CASSANDRA-8559) OOM caused by large tombstone warning.

["Ariel Weisberg (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-8559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14535252#comment-14535252 ] 

Ariel Weisberg commented on CASSANDRA-8559:
-------------------------------------------

[~iamaleksey] What's the data model or queries that cause this? Are they worth including in our testing process?

> OOM caused by large tombstone warning.
> --------------------------------------
>
>                 Key: CASSANDRA-8559
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8559
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: 2.0.11 / 2.1
>            Reporter: Dominic Letz
>            Assignee: Aleksey Yeschenko
>              Labels: tombstone
>             Fix For: 2.0.15, 2.1.5
>
>         Attachments: 8559.txt, Selection_048.png, cassandra-2.0.11-8559.txt, stacktrace.log
>
>
> When running with high amount of tombstones the error message generation from CASSANDRA-6117 can lead to out of memory situation with the default setting.
> Attached a heapdump viewed in visualvm showing how this construct created two 777mb strings to print the error message for a read query and then crashed OOM.
> {code}
>         if (respectTombstoneThresholds() && columnCounter.ignored() > DatabaseDescriptor.getTombstoneWarnThreshold())
>         {
>             StringBuilder sb = new StringBuilder();
>             CellNameType type = container.metadata().comparator;
>             for (ColumnSlice sl : slices)
>             {
>                 assert sl != null;
>                 sb.append('[');
>                 sb.append(type.getString(sl.start));
>                 sb.append('-');
>                 sb.append(type.getString(sl.finish));
>                 sb.append(']');
>             }
>             logger.warn("Read {} live and {} tombstoned cells in {}.{} (see tombstone_warn_threshold). {} columns was requested, slices={}, delInfo={}",
>                         columnCounter.live(), columnCounter.ignored(), container.metadata().ksName, container.metadata().cfName, count, sb, container.deletionInfo());
>         }
> {code}



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