Running a Solr query has no impact on writes -- Riak search queries are direct
pass throughs to Solr query and don't touch any of the salient Riak systems
(batching writes to Solr, YZ AAE, etc). I believe the timing of the
reappearance is a coincidence.
Is it possible the object reappeared via MDC? Do you have record of the
reappeared object in your other cluster?
Also, just to confirm, when you say the object reappeared -- it re-appeared in
Riak (and subsequently in Solr), correct? Or are you saying you just find the
object in Solr (via a search)?
-Fred
> On Feb 23, 2017, at 1:43 AM, al so <volks...@gmail.com> wrote:
>
> Here is brief env:
> Riak v 2.0.8 + Solr/ 5 node cluster/ MDC
>
> Problem:
> Deleted object suddenly resurrected after few days. Solr search
> query("*:*") was executed around the time of reappearance.
>
> Bucket property for this reappeared object
> {
> "props": {
> "name": "UsaHype",
> "allow_mult": false,
> "basic_quorum": false,
> "big_vclock": 50,
> "chash_keyfun": {
> "mod": "riak_core_util",
> "fun": "chash_std_keyfun"
> },
> "dvv_enabled": true,
> "dw": "quorum",
> "last_write_wins": false,
> "linkfun": {
> "mod": "riak_kv_wm_link_walker",
> "fun": "mapreduce_linkfun"
> },
> "n_val": 3,
> "notfound_ok": true,
> "old_vclock": 86400,
> "postcommit": [
> {
> "mod": "riak_repl_leader",
> "fun": "postcommit"
> },
> {
> "mod": "riak_repl2_rt",
> "fun": "postcommit"
> }
> ],
> "pr": 0,
> "precommit": [
>
> ],
> "pw": 0,
> "r": "quorum",
> "repl": true,
> "rw": "quorum",
> "small_vclock": 50,
> "w": "quorum",
> "young_vclock": 20
> }
> }
>
> delete_mode is not configured at all. Defaults to 3 sec? Do Tombstone still
> get created when no delete_mode at all in the config? Can we query
> metadata(X-Riak-Deleted) for this reappeared object.
> How would one go about finding root cause. I do know the date when the
> object was deleted from our app logs. I also seem to know when it reappeared.
> Seems like a solr search ("*:*") in code was executed just before this object
> reappeared? Look at AAE? Is there a way to find if Solr and Riak backends are
> out-of-sync (AAE?).
>
> I understand tuning other params (allow_mult = true, ...) will have its own
> implications.
>
> In summary:
> How do I find root cause of this issue.
> How to reliable delete an object.
>
> -Volk
>
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