[jira] [Commented] (CASSANDRA-6998) HintedHandoff - expired hints may block future hints deliveries

["Aleksey Yeschenko (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-6998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13962935#comment-13962935 ] 

Aleksey Yeschenko commented on CASSANDRA-6998:
----------------------------------------------

See CASSANDRA-6666

> HintedHandoff - expired hints may block future hints deliveries
> ---------------------------------------------------------------
>
>                 Key: CASSANDRA-6998
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6998
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: - cluster of two DCs: DC1, DC2
> - keyspace using NetworkTopologyStrategy (replication factors for both DCs)
> - heavy load (write:read, 100:1) with LOCAL_QUORUM using Java driver setup with DC awareness, writing to DC1
>            Reporter: Scooletz
>              Labels: HintedHandoff, TTL
>             Fix For: 2.0.3
>
>
> For tests purposes, DC2 was shut down for 1 day. The _hints_ table was filled with millions of rows. Now, when _HintedHandOffManager_ tries to _doDeliverHintsToEndpoint_  it queries the store with QueryFilter.getSliceFilter which counts deleted (TTLed) cells and throws org.apache.cassandra.db.filter.TombstoneOverwhelmingException. 
> Throwing this exception stops the manager from running compaction as it is run only after successful handoff. This leaves the HH practically disabled till administrator runs truncateAllHints. 
> Wouldn't it be nicer if on org.apache.cassandra.db.filter.TombstoneOverwhelmingException run compaction? That would remove TTLed hints leaving whole HH mechanism in a healthy state.



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