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From "Dominic Letz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8559) OOM caused by large tombstone warning.
Date Mon, 05 Jan 2015 12:13:35 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14264538#comment-14264538
] 

Dominic Letz commented on CASSANDRA-8559:
-----------------------------------------

Both is true, there are huge gaps filled with many tombstones that do that to the query and
we like the error message that warns us about that and helps us fixing that issue. But in
this case the error message was the issue. 

> 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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