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https://issues.apache.org/jira/browse/CASSANDRA-8089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14166657#comment-14166657
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Andrew S commented on CASSANDRA-8089:
-------------------------------------
Same error message on all nodes and tables mentioned.
/opt/apache-cassandra/bin/nodetool --host xxx.xxx.xxx.xxx cfhistograms XXX xxx
nodetool: Unable to compute when histogram overflowed
It looks from here that this histogram issue may not be related to tombstone
warnings we get, as we only get them on one table, but histograms are not
working for more tables. Do you think these are two separate issues?
> Invalid tombstone warnings / exceptions
> ---------------------------------------
>
> Key: CASSANDRA-8089
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8089
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: Cassandra 2.1.0
> Debian 7.6, 3.2.0-4-amd64 GNU/Linux
> java version "1.7.0_51"
> Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
> Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)
> Reporter: Andrew S
>
> Hey,
> We are having a strange issue with tombstone warnings which look like this:
> {code}
> WARN 12:28:42 Read 129 live and 4113 tombstoned cells in XXX.xxx (see
> tombstone_warn_threshold). 500 columns was requested,
> slices=[31660a4e-4f94-11e4-ac1d-53f244a29642-0a8073aa-4f9f-11e4-87c7-5b3e253389d8:!],
> delInfo={deletedAt=-9223372036854775808, localDeletion=2147483647}
> {code}
> What is strange is that the row requested should not contain any tombstones
> as we never delete data from that row. (We do delete data from other row in
> the same column family)
> To debug the issue we have dumped the data for this row using sstable2json
> and the result does not contain any tombstones. (We have done this on all
> nodes having the data and all sstables containing the key)
> {code}
> ./sstable2json /var/lib/cassandra/data/XXX/xxx/XXX-xxx-ka-81524-Data.db -k
> "xxxxxxxxxxx"
> {code}
> We are getting the warnings after issuing a simple query:
> {code}
> select count(*) from xxx where key = 'xxxxx' and aggregate='xxxxx';
> {code}
> There are only ~500 cells but it issues a warning about scanning 1700
> tombstones.
> We are very worried about this because for some of the queries we are hitting
> TombstoneOverwhelmingException for no obvious reason.
> Here is the table definiion:
> {code}
> CREATE TABLE "Xxxx".xxx (
> key text,
> aggregate text,
> t timeuuid,
> ..... {date fields }
> PRIMARY KEY ((key, aggregate), t)
> ) WITH CLUSTERING ORDER BY (t ASC)
> AND bloom_filter_fp_chance = 0.01
> AND caching = '{"keys":"ALL", "rows_per_partition":"NONE"}'
> AND comment = 'we love cassandra'
> AND compaction = {'min_threshold': '6', 'class':
> 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
> 'max_threshold': '32'}
> AND compression = {'sstable_compression':
> 'org.apache.cassandra.io.compress.SnappyCompressor'}
> AND dclocal_read_repair_chance = 0.0
> AND default_time_to_live = 0
> AND gc_grace_seconds = 3600
> AND max_index_interval = 2048
> AND memtable_flush_period_in_ms = 0
> AND min_index_interval = 128
> AND read_repair_chance = 0.1
> AND speculative_retry = '99.0PERCENTILE';
> {code}
> Do you have any ideas how can we debug this further?
> Thanks,
> Andrew
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