Merge "Adding doc about data source placeholders"
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@ -233,3 +233,20 @@ Public objects created in one tenant can be used from other tenants (for
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example, a cluster can be created from a public cluster template which is
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created in another tenant), but modification operations are possible only from
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the tenant in which object was created.
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Data source placeholders support
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--------------------------------
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Sahara supports special strings that can be used in data source URLs. These
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strings will be replaced with appropriate values during job execution which
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allows the use of the same data source as an output multiple times.
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There are 2 types of string currently supported:
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* ``%JOB_EXEC_ID%`` - this string will be replaced with the job execution ID.
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* ``%RANDSTR(len)%`` - this string will be replaced with random string of
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lowercase letters of length ``len``.
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After placeholders are replaced, the real URLs are stored in the
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``data_source_urls`` field of the job execution object. This is used later to
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find objects created by a particular job run.
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