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c2ec23c953
For cross-replication topology setups load_balancing=in_order works best as nodes handle equal amount of load and usually they hit only 1/n of data (n = number of replicas), which makes page cache usage more efficient. The problem is when one node of the shard goes down. If one replica goes down, the next one in config will handle twice the usual load while remaining ones will handle usual traffic. Closes #4820.
131 lines
5.5 KiB
XML
131 lines
5.5 KiB
XML
<?xml version="1.0"?>
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<yandex>
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<!-- Profiles of settings. -->
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<profiles>
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<!-- Default settings. -->
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<default>
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<!-- Maximum memory usage for processing single query, in bytes. -->
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<max_memory_usage>10000000000</max_memory_usage>
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<!-- Use cache of uncompressed blocks of data. Meaningful only for processing many of very short queries. -->
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<use_uncompressed_cache>0</use_uncompressed_cache>
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<!-- How to choose between replicas during distributed query processing.
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random - choose random replica from set of replicas with minimum number of errors
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nearest_hostname - from set of replicas with minimum number of errors, choose replica
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with minimum number of different symbols between replica's hostname and local hostname
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(Hamming distance).
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in_order - first live replica is chosen in specified order.
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first_or_random - if first replica one has higher number of errors, pick a random one from replicas with minimum number of errors.
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-->
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<load_balancing>random</load_balancing>
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</default>
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<!-- Profile that allows only read queries. -->
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<readonly>
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<readonly>1</readonly>
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</readonly>
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</profiles>
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<!-- Users and ACL. -->
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<users>
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<!-- If user name was not specified, 'default' user is used. -->
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<default>
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<!-- Password could be specified in plaintext or in SHA256 (in hex format).
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If you want to specify password in plaintext (not recommended), place it in 'password' element.
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Example: <password>qwerty</password>.
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Password could be empty.
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If you want to specify SHA256, place it in 'password_sha256_hex' element.
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Example: <password_sha256_hex>65e84be33532fb784c48129675f9eff3a682b27168c0ea744b2cf58ee02337c5</password_sha256_hex>
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How to generate decent password:
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Execute: PASSWORD=$(base64 < /dev/urandom | head -c8); echo "$PASSWORD"; echo -n "$PASSWORD" | sha256sum | tr -d '-'
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In first line will be password and in second - corresponding SHA256.
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-->
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<password></password>
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<!-- List of networks with open access.
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To open access from everywhere, specify:
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<ip>::/0</ip>
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To open access only from localhost, specify:
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<ip>::1</ip>
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<ip>127.0.0.1</ip>
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Each element of list has one of the following forms:
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<ip> IP-address or network mask. Examples: 213.180.204.3 or 10.0.0.1/8 or 10.0.0.1/255.255.255.0
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2a02:6b8::3 or 2a02:6b8::3/64 or 2a02:6b8::3/ffff:ffff:ffff:ffff::.
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<host> Hostname. Example: server01.yandex.ru.
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To check access, DNS query is performed, and all received addresses compared to peer address.
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<host_regexp> Regular expression for host names. Example, ^server\d\d-\d\d-\d\.yandex\.ru$
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To check access, DNS PTR query is performed for peer address and then regexp is applied.
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Then, for result of PTR query, another DNS query is performed and all received addresses compared to peer address.
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Strongly recommended that regexp is ends with $
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All results of DNS requests are cached till server restart.
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-->
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<networks incl="networks" replace="replace">
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<ip>::/0</ip>
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</networks>
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<!-- Settings profile for user. -->
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<profile>default</profile>
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<!-- Quota for user. -->
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<quota>default</quota>
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<!-- For testing the table filters -->
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<databases>
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<test>
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<!-- Simple expression filter -->
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<filtered_table1>
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<filter>a = 1</filter>
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</filtered_table1>
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<!-- Complex expression filter -->
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<filtered_table2>
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<filter>a + b < 1 or c - d > 5</filter>
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</filtered_table2>
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<!-- Filter with ALIAS column -->
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<filtered_table3>
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<filter>c = 1</filter>
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</filtered_table3>
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</test>
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</databases>
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</default>
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<!-- Example of user with readonly access. -->
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<!-- <readonly>
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<password></password>
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<networks incl="networks" replace="replace">
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<ip>::1</ip>
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<ip>127.0.0.1</ip>
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</networks>
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<profile>readonly</profile>
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<quota>default</quota>
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</readonly> -->
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</users>
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<!-- Quotas. -->
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<quotas>
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<!-- Name of quota. -->
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<default>
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<!-- Limits for time interval. You could specify many intervals with different limits. -->
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<interval>
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<!-- Length of interval. -->
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<duration>3600</duration>
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<!-- No limits. Just calculate resource usage for time interval. -->
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<queries>0</queries>
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<errors>0</errors>
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<result_rows>0</result_rows>
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<read_rows>0</read_rows>
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<execution_time>0</execution_time>
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</interval>
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</default>
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</quotas>
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</yandex>
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