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This article introduces the relevant knowledge of "how to solve the problem of solrcloud shard copy in CDH". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Version CDH5.4.4

The number of nodes:3

Want to enable nodes to back up each other directly:

Command:

Solrctl instancedir-create myCollection / home/test

Solrctl collection-- create myCollection-s 1-r 2 (It was successful)

But: solrctl collection-- create myCollection-s 3-r 2:

It is an error:Cannot create collection mycollection. Value of maxShardsPerNode is 1

Please take a look at the official post: https://community.cloudera.com/t5/Cloudera-Search-Apache-SolrCloud/Indexing-files-on-HDFS-using-solrcloud-on-cloudera-and-searching/td-p/30656

You can also refer to the official document: http://wiki.apache.org/solr/SolrCloud

In fact, by default: the maximum shard per node is 1 (maxShardsPerNode=1)

But we can: however, you can override this by overriding the value of the "maxShardsPerNode" parameter, as you did with the curl command. (that is, it has been implemented with the URL command)

Step: solrctl instancedir-- create myCollection / home/test

You can click on CDH's solrcloud management interface:

Http://hadoopnamenode:8983/solr/admin/collections?action=CREATE&name=myCollection&numShards=3&replicationFactor=3&maxShardsPerNode=3

Note: this is the management collection, so use collections?

Create a core on node1 as follows:

'http://node1:8983/solr/admin/cores?action=CREATE&name=mycore&collection=collection1&shard=shard2'

Then use: solrctl collection-- list to find that we have successfully created

Note: when we use cdh for multipart backup, the maxShardsPerNode must be greater than 1 when establishing collection, such as 3 here. Later, when a server is down, the newly added server can be used to create the URL of core. If we use the default maxShardsPerNode=1, although the query is created successfully, the query will still fail. When the backup is created, the new core will automatically copy the index.

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