> ## Documentation Index
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> Contains in-memory state of S3Queue metadata and currently processed rows per file.

# system.s3queue_metadata_cache

<h2 id="description">
  Description
</h2>

Contains in-memory state of S3Queue metadata and currently processed rows per file.

<h2 id="columns">
  Columns
</h2>

* `zookeeper_path` ([String](/reference/data-types/string)) — Path in zookeeper to metadata
* `file_path` ([String](/reference/data-types/string)) — File path of a file which is being processed
* `file_name` ([String](/reference/data-types/string)) — File name of a file which is being processed
* `rows_processed` ([UInt64](/reference/data-types/int-uint)) — Currently processed number of rows
* `status` ([String](/reference/data-types/string)) — Status of processing: Processed, Processing, Failed, or None for a file which the cache knows but has no state for, e.g. a file whose processing was reset. A non-null `processing_observed_in_keeper_time` means that the `Processing` status was not set by the processor which holds the file, but read from keeper
* `processing_start_time` ([Nullable(DateTime)](/reference/data-types/nullable)) — Time at which processing of the file started
* `processing_end_time` ([Nullable(DateTime)](/reference/data-types/nullable)) — Time at which processing of the file ended
* `exception` ([String](/reference/data-types/string)) — Exception which happened during processing. Always the one of the last attempt of this server, never the one which keeper stores for the file
* `processing_observed_in_keeper_time` ([Nullable(DateTime)](/reference/data-types/nullable)) — Time at which a processor of this server failed to take the file and read the `Processing` status from keeper instead of setting it itself. Usually the file is held by another server, but it can also be held by a processor of this server which had just taken it. In either case `rows_processed`, `processing_start_time`, `processing_end_time` and `exception` describe the last attempt of this server to process the file, not the processing which holds it now