![]() ![]() ![]() So, if one node lags behind or stops responding, Solr stops using it. In this case, Solr selects F instead of B. Also, the shards (A, B, C, D or A, F, C, D) to be used for that request are selected dynamically. In dynamic sharding, Alfresco Content Services will use instance A, B, C, D, or F for querying.Īt query time, Solr is aware of all the available nodes and selects one node as the coordinator (one node from all the available green ones) and sends the request to it. So, the query can be sent to any instance. In manual sharding, the user is only aware of the existence of the shards and its instances but knows nothing about the status of each shard and its instance(s). Shard instance H is silent and therefore, unavailable for querying. Instances A, B, C, D, and F are up-to-date, while the instances E and G are lagging behind and can’t be used. ![]() In this example, there are 4 shards (1, 2, 3, and 4) and 2 instances for each shard (A & E, B & F, C & G, and D & H). The following diagram shows the difference between manual and dynamic sharding. Phase 1 involves query and an initial round of faceting, and Phase 2 involves pulling back information from each relevant document and facet refinement. The distributed query is done is two phases. In case of a distributed query, the query is sent to other parts of the index and then combined into an overall result. The request handler determines if the query is local or distributed. The query is sent to Solr and then to the request handler. The shard registry stores all the information about that particular index, for example the status of the index, transactions in index, and so on. Dynamic sharding determines what best shards are available to answer a query. When the user initiates a query, it can either be executed by manually mapping the stores (explicit configuration), or by shard registry via dynamic sharding. This section describes how to create and configure Solr sharding.Īs shown in the diagram below, the trackers communicate with the repository. This can either be done manually by configuring the indexes, or by allowing Alfresco Content Services to discover shards dynamically. After creating the shards manually, an Alfresco Content Services administrator has to instruct Alfresco Content Services how to find the indexes. ![]()
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