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From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8559) OOM caused by large tombstone warning.
Date Mon, 05 Jan 2015 11:22:34 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14264497#comment-14264497
] 

Benedict commented on CASSANDRA-8559:
-------------------------------------

This suggests you are _requesting_ some gigantic (or huge number) of slices in your query?
It is still a bug that we try to print them all, but I suspect you have something funky going
on with your query as well.

> 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
>         Attachments: Selection_048.png
>
>
> 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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