How to avoid the stalemate between count with all and several calls from an EP getBackingMapEntry...

We have a processor input, which initiates a transaction lite by calling getBackingMapEntry on several similar entries.  The same cache distributed these similar entries of accommodation also simultaneously services count with all call and we often a blocking scenario comes from the fact that the count with all call trying to access/key in the same cache block - but in a different sequence - date entry processor accessed (for example, the European Parliament access to similar input 1 then similar input 2 while the count with all attempts to block the same but entries in sequence 2) then the entry 1).  The obvious solution is to change the sequence entry processor accesses these entries to match the sequence used by the count with all operation, but we do not know what sequence consistency applies to operations NamedCache.getAll.  Anyone know?  We believe that we excluded (e.g., consistency does not consider wrt the count with all access sequence) the following:

  • The sequence in an ordered collection of keys such as a list that is passed as an argument to count with all operation
  • The hash code of the key value
  • Any use of Comparable on the keys

We use 3.7.1 consistency where it varies between 3.7.1 and 12 c.

Thanks in advance.

We've thought of it (always happens shortly after the publication on a support site).  If anyone is curious, it seems that the binary class implements Comparable and that consistency sorts instance converted by binary key and access the Scriptures based on this order sorted.  If the entry processor converts the keys to binary instances, sorts and accessed in sorted order, there is no potential blocking (of our observations, at least).  It would be nice if Oracle should document this that people better understand how to write safe concurrent code.

Tags: Fusion Middleware

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