Tomasz Grabiec 059a1a4f22 db: Fix commitlog replay to not drop cell mutations with older schema ...

column_mapping is not safe to access across shards, because data_type
is not safe to access. One of the manifestation of this is that
abstract_type::is_value_compatible_with() always fails if the two
types belong to different shards.

During replay, column_mapping lives on the replaying shard, and is
used by converting_mutation_partition_applier against the schema on
the target shard. Since types in the mapping will be considered
incompatible with types in the schema, all cells will be dropped.

Fix by using column_mapping in a safe way, by copying it to the target
shard if necessary. Each shard maintains its own cache of column
mappings.

Fixes #1924.
Message-Id: <1481310463-13868-1-git-send-email-tgrabiec@scylladb.com>

2016-12-13 12:19:32 +02:00

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