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Notes on cassandra avro interface

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commit d1bc9d6fce89a45574c3937fc0bcef65a7de3dae 1 parent 1a95b6c
Philip (flip) Kromer authored
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36 docpages/avro/performance.textile
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+
+
+h2. Bulk Streaming use cases
+
+* Take a bunch of nightly calculations and need to flood it into the DB -- http://sna-projects.com/blog/2009/06/building-a-1-tb-data-cycle-at-linkedin-with-hadoop-and-project-voldemort/ In this case, it's important that the bulk load happen efficiently but with low stress on the DB. I'm willing to make it so that data streams to each cassandra node in the sort order and pre-partitioned just like the node wants to use it. Should run at the full streaming speed of the disk.
+
+* Building a new table or moving a legacy database over to cassandra. I want to write from one or several nodes, probably not in the cluster, and data will be completely unpartitioned. I might be able to make some guarantees about uniqueness of keys and rows (that is, you'll generally only see a key once, and/or when you see a key it will contain the entire row). 20k inserts/s / receiving node.
+
+* Using cassandra to replace HDFS. Replication is for compute, not for availability -- so efficient writing at consistency level ANY is important. Would like to get 100k inserts/s per receiving node.
+
+* A brand new user wants to just stuff his goddamn data into the goddamn database and start playing with it. It had better be not-terribly-slow, and it had better be really easy to take whatever insane format it shows up in and cram that into the data hole. It should also be conceptually straighforward: it should look like I'm writing hashes or hashes of hashes.
+
+
+===========================================================================
+From http://sna-projects.com/blog/2009/06/building-a-1-tb-data-cycle-at-linkedin-with-hadoop-and-project-voldemort/
+
+Here are the times taken:
+
+* 100GB: 28mins (400 mappers, 90 reducers)
+* 512GB: 2hrs, 16mins (2313 mappers, 350 reducers)
+* 1TB: 5hrs, 39mins (4608 mappers, 700 reducers)
+
+Data transfer between the clusters happens at a steady rate bound by the disk or network. For our Amazon instances this is around 40MB/second.
+
+Online Performance
+
+Lookup time for a single Voldemort node compares well to a single MySQL instance as well. To test this we ran local tests against the 100GB per-node data from the 1 TB test. This test as well was run on an Amazon Extra Large instance with 15GB of RAM and the 4 ephemeral disks in a RAID 10 configuration. To run the tests we simulated we simulated 1 million requests from a real request stream recorded on our production system against each of storage systems. We see the following performance for 1 million requests against a single node:
+ MySQL Voldemort
+Reqs per sec. 727 1291
+Median req. time 0.23 ms 0.05 ms
+Avg. req. time 13.7 ms 7.7 ms
+
+99th percentile req. time
+ 127.2 ms 100.7 ms
+
+These numbers are both for local requests with no network involved as the only intention is to benchmark the storage layer of these systems.
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211 examples/cassandra_streaming/client_schema.avpr
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+{
+ "protocol" : "Cassandra",
+ "namespace" : "org.apache.cassandra.avro", "types" : [
+
+Add/insert one value
+
+ Mutate ks, [col_ref], 'val', ts, ttl }
+
+Add/insert multiple cols to same row
+
+ MutateRow ks, supercol_or_nil, { [col, val, ts, ttl], [col,val,ts,ttl],...}}
+ MutateCRow ks, { [col, val, ts, ttl], [col,val,ts,ttl],...}}
+ MutateSCRow ks, supercol, { [col, val, ts, ttl], [col,val,ts,ttl],...}}
+
+Get one, many or all columns from given row
+
+ get
+ Multiget ks, supercol_or_nil, [col1, col2, ...] or nil
+
+Get one, many or all columns from a slice of sequential rows
+
+ get_range
+
+Remove one column from a row
+
+ remove
+
+Remove many columns from a row
+
+Remove all columns in a row
+
+
+
+h3. Mo
+
+
+ { "name" : "AccessLevel", "type" : "enum", "symbols" : [ "NONE", "READONLY", "READWRITE", "FALL" ] },
+ { "name" : "ColumnPath", "type" : "record", "fields" : [
+ { "name" : "column_family", "type" : "string"},
+ { "name" : "super_column", "type" : [ "bytes", "null" ]},
+ { "name" : "column", "type" : [ "bytes", "null" ] } ]},
+ { "name" : "ColumnParent", "type" : "record", "fields" : [
+ { "name" : "column_family", "type" : "string"},
+ { "name" : "super_column", "type" : [ "bytes", "null" ] } ]},
+ { "name" : "SliceRange", "type" : "record", "fields" : [
+ { "name" : "start", "type" : "bytes"},
+ { "name" : "finish", "type" : "bytes"},
+ { "name" : "reversed", "type" : "boolean"},
+ { "name" : "count", "type" : "int"},
+ { "name" : "bitmasks", "type" : [ { "type" : "array", "items" : "bytes"}, "null" ] } ]},
+ { "name" : "SlicePredicate", "type" : "record", "fields" : [
+ { "name" : "column_names", "type" : [ { "type" : "array", "items" : "bytes"}, "null" ]},
+ { "name" : "slice_range", "type" : [ "SliceRange", "null" ] } ]},
+
+ { "name" : "Clock", "type" : "record", "fields" : [
+ { "name" : "timestamp", "type" : "long" } ]},
+ { "name" : "Column", "type" : "record", "fields" : [
+ { "name" : "name", "type" : "bytes"},
+ { "name" : "value", "type" : "bytes"},
+ { "name" : "clock", "type" : "Clock"},
+ { "name" : "ttl", "type" : "int" } ]},
+ { "name" : "SuperColumn", "type" : "record", "fields" : [
+ { "name" : "name", "type" : "bytes"},
+ { "name" : "columns", "type" : { "type" : "array", "items" : "Column" } } ]},
+ { "name" : "ColumnOrSuperColumn", "type" : "record", "fields" : [
+ { "name" : "column", "type" : "Column" },
+ { "name" : "super_column", "type" : "null" } ]},
+ { "name" : "Deletion", "type" : "record", "fields" : [
+ { "name" : "clock", "type" : "Clock"},
+ { "name" : "super_column", "type" : [ "bytes", "null" ]},
+ { "name" : "predicate", "type" : [ "SlicePredicate", "null" ] } ]},
+ { "name" : "Mutation", "type" : "record", "fields" : [
+ { "name" : "column_or_supercolumn", "type" : "ColumnOrSuperColumn" },
+ { "name" : "deletion", "type" : "null" }
+ ]},
+ { "name" : "StreamingMutation", "type" : "record", "fields" : [
+ { "name" : "key", "type" : "bytes" },
+ { "name" : "mutation", "type" : "Mutation" } ]},
+
+ { "name" : "IndexType", "type" : "enum", "symbols" : [ "KEYS" ]},
+ { "name" : "ColumnDef", "type" : "record", "fields" : [
+ { "name" : "name", "type" : "bytes"},
+ { "name" : "validation_class", "type" : "string"},
+ { "name" : "index_type", "type" : [ "IndexType", "null" ]},
+ { "name" : "index_name", "type" : [ "string", "null" ] } ]},
+ { "name" : "CfDef", "type" : "record", "fields" : [
+ { "name" : "keyspace", "type" : "string"},
+ { "name" : "name", "type" : "string"},
+ { "name" : "column_type", "type" : [ "string", "null" ]},
+ { "name" : "clock_type", "type" : [ "string", "null" ]},
+ { "name" : "comparator_type", "type" : [ "string", "null" ]},
+ { "name" : "subcomparator_type", "type" : [ "string", "null" ]},
+ { "name" : "reconciler", "type" : [ "string", "null" ]},
+ { "name" : "comment", "type" : [ "string", "null" ]},
+ { "name" : "row_cache_size", "type" : [ "double", "null" ]},
+ { "name" : "preload_row_cache", "type" : [ "boolean", "null" ]},
+ { "name" : "key_cache_size", "type" : [ "double", "null" ]},
+ { "name" : "read_repair_chance", "type" : [ "double", "null" ]},
+ { "name" : "gc_grace_seconds", "type" : [ "int", "null" ]},
+ { "name" : "column_metadata", "type" : [ { "type" : "array", "items" : "ColumnDef"}, "null" ]},
+ { "name" : "id", "type" : [ "int", "null" ] } ]},
+ { "name" : "KsDef", "type" : "record", "fields" : [
+ { "name" : "name", "type" : "string"}, { "name" : "strategy_class", "type" : "string"},
+ { "name" : "strategy_options", "type" : [ { "type" : "map", "values" : "string"}, "null" ]},
+ { "name" : "replication_factor", "type" : "int"}, { "name" : "cf_defs", "type" : { "type" : "array", "items" : "CfDef" } } ]},
+ { "name" : "MutationsMapEntry", "type" : "record", "fields" : [ { "name" : "key", "type" : "bytes"}, { "name" : "mutations", "type" : { "type" : "map", "values" : { "type" : "array", "items" : "Mutation" } } } ]},
+ { "name" : "CoscsMapEntry", "type" : "record", "fields" : [ { "name" : "key", "type" : "bytes"}, { "name" : "columns", "type" : { "type" : "array", "items" : "ColumnOrSuperColumn" } } ]},
+ { "name" : "ConsistencyLevel", "type" : "enum", "symbols" : [ "ZERO", "ONE", "QUORUM", "DCQUORUM", "DCQUORUMSYNC", "ALL" ]},
+ { "name" : "InvalidRequestException", "type" : "error", "fields" : [ { "name" : "why", "type" : [ "string", "null" ] } ]},
+ { "name" : "NotFoundException", "type" : "error", "fields" : [ { "name" : "why", "type" : [ "string", "null" ] } ]},
+ { "name" : "UnavailableException", "type" : "error", "fields" : [ { "name" : "why", "type" : [ "string", "null" ] } ]},
+ { "name" : "TimedOutException", "type" : "error", "fields" : [ { "name" : "why", "type" : [ "string", "null" ] } ] }
+ ],
+
+
+ "messages" : { "get" : {
+ "request" : [ { "name" : "key", "type" : "bytes"},
+ { "name" : "column_path", "type" : "ColumnPath"},
+ { "name" : "consistency_level", "type" : "ConsistencyLevel"
+ } ],
+ "response" : "ColumnOrSuperColumn",
+ "errors" : [ "InvalidRequestException", "NotFoundException", "UnavailableException", "TimedOutException" ]
+ },
+ "get_slice" : {
+ "request" : [ { "name" : "key", "type" : "bytes"},
+ { "name" : "column_parent", "type" : "ColumnParent"},
+ { "name" : "predicate", "type" : "SlicePredicate"},
+ { "name" : "consistency_level", "type" : "ConsistencyLevel"
+ } ],
+ "response" : { "type" : "array",
+ "items" : "ColumnOrSuperColumn"
+ },
+ "errors" : [ "InvalidRequestException", "UnavailableException", "TimedOutException" ]
+ },
+ "multiget_slice" : {
+ "request" : [ { "name" : "keys", "type" : { "type" : "array",
+ "items" : "bytes"
+ }},
+ { "name" : "column_parent", "type" : "ColumnParent"},
+ { "name" : "predicate", "type" : "SlicePredicate"},
+ { "name" : "consistency_level", "type" : "ConsistencyLevel"
+ } ],
+ "response" : { "type" : "array",
+ "items" : "CoscsMapEntry"
+ },
+ "errors" : [ "InvalidRequestException", "UnavailableException", "TimedOutException" ]
+ },
+ "get_count" : {
+ "request" : [ { "name" : "key", "type" : "bytes"},
+ { "name" : "column_parent", "type" : "ColumnParent"},
+ { "name" : "predicate", "type" : "SlicePredicate"},
+ { "name" : "consistency_level", "type" : "ConsistencyLevel"
+ } ],
+ "response" : "int",
+ "errors" : [ "InvalidRequestException", "UnavailableException", "TimedOutException" ]
+ },
+ "insert" : {
+ "request" : [ { "name" : "key", "type" : "bytes"},
+ { "name" : "column_parent", "type" : "ColumnParent"},
+ { "name" : "column", "type" : "Column"},
+ { "name" : "consistency_level", "type" : "ConsistencyLevel"
+ } ],
+ "response" : "null",
+ "errors" : [ "InvalidRequestException", "UnavailableException", "TimedOutException" ]
+ },
+ "remove" : {
+ "request" : [ { "name" : "key", "type" : "bytes"},
+ { "name" : "column_path", "type" : "ColumnPath"},
+ { "name" : "clock", "type" : "Clock"},
+ { "name" : "consistency_level", "type" : "ConsistencyLevel"
+ } ],
+ "response" : "null",
+ "errors" : [ "InvalidRequestException", "UnavailableException", "TimedOutException" ]
+ },
+ "batch_mutate" : {
+ "request" : [ { "name" : "mutation_map", "type" : { "type" : "array",
+ "items" : "MutationsMapEntry"
+ }},
+ { "name" : "consistency_level", "type" : "ConsistencyLevel"
+ } ],
+ "response" : "null",
+ "errors" : [ "InvalidRequestException", "UnavailableException", "TimedOutException" ]
+ },
+ "system_add_keyspace" : {
+ "request" : [ { "name" : "ks_def", "type" : "KsDef"
+ } ],
+ "response" : "null",
+ "errors" : [ "InvalidRequestException" ]
+ },
+ "set_keyspace" : {
+ "request" : [ { "name" : "keyspace", "type" : "string"
+ } ],
+ "response" : "null",
+ "errors" : [ "InvalidRequestException" ]
+ },
+ "describe_keyspaces" : {
+ "request" : [ ],
+ "response" : { "type" : "array",
+ "items" : "string"
+ }
+ },
+ "describe_cluster_name" : {
+ "request" : [ ],
+ "response" : "string"
+ },
+ "describe_version" : {
+ "request" : [ ],
+ "response" : "string"
+ }
+ }
+}
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318 examples/cassandra_streaming/client_schema.textile
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+
+
+h3. Operations
+
+* Add/insert one value
+
+ Mutate ks, [col_ref], 'val', ts, ttl }
+
+* Add/insert multiple cols to same row
+
+ MutateRow ks, supercol_or_nil, { [col, val, ts, ttl], [col,val,ts,ttl],...}}
+ MutateCRow ks, { [col, val, ts, ttl], [col,val,ts,ttl],...}}
+ MutateSCRow ks, supercol, { [col, val, ts, ttl], [col,val,ts,ttl],...}}
+
+
+ pycassa cf.insert('key1',
+ { '1': {'sub1': 'val1', 'sub2': 'val2'},
+ '2': {'sub3': 'val3', 'sub4': 'val4'} })
+
+ pycassa cf.remove('key1', super_column='1')
+
+ pycassa cf.get_range(super_column='2')
+ pycassa cf.get('key1')
+ pycassa cf.get('key1', super_column='2')
+ pycassa cf.multiget(['key1'], super_column='2')
+
+ pycassa Test.objects.get_count(t.key)
+
+ get_indexed_slices
+ get_range
+
+
+* Get one, many or all columns from given row
+
+ get key, super_column, columns, column_start, column_finish, column_reversed, column_count, consistency
+
+ Multiget ks, supercol_or_nil, [col1, col2, ...] or nil
+
+* Get one, many or all columns from a slice of sequential rows
+
+ get_range
+
+* Remove one column from a row
+
+ remove
+
+* Remove many columns from a row
+
+* Remove all columns in a row
+
+
+h4. Hector
+
+http://github.com/rantav/hector/tree/master/src/main/java/me/prettyprint/cassandra/examples/
+
+ keyspace = client.getKeyspace("Keyspace1");
+ ColumnPath columnPath = new ColumnPath("Standard1");
+ columnPath.setColumn(bytes("column-name"));
+
+ // insert
+ keyspace.insert("key", columnPath, bytes("value"));
+ insert(final String key, final String value)
+
+ // read
+ Column col = keyspace.getColumn("key", columnPath);
+ System.out.println("Read from cassandra: " + string(col.getValue()));
+ get(final String key)
+
+ delete(final String key)
+
+h4. fauna/cassandra
+
+
+ client.insert(:Users, "5", {'screen_name' => "buttonscat"})
+ client.insert(:UserRelationships, "5", {"user_timeline" => {UUID.new => "1"}})
+ timeline = client.get(:UserRelationships, "5", "user_timeline")
+
+
+ # Insert a row for a key. Pass a flat hash for a regular column family, and
+ # a nested hash for a super column family. Supports the <tt>:consistency</tt>,
+ # <tt>:timestamp</tt> and <tt>:ttl</tt> options.
+ def insert(column_family, key, hash, options = {})
+
+
+ ## Delete
+ # _mutate the element at the column_family:key:[column]:[sub_column]
+ # path you request. Supports the <tt>:consistency</tt> and <tt>:timestamp</tt>
+ # options.
+ def remove(column_family, key, *columns_and_options)
+
+
+### Read
+
+ # Count the elements at the column_family:key:[super_column] path you
+ # request. Supports the <tt>:consistency</tt> option.
+ def count_columns(column_family, key, *columns_and_options)
+
+ # Multi-key version of Cassandra#count_columns. Supports options <tt>:count</tt>,
+ # <tt>:start</tt>, <tt>:finish</tt>, <tt>:reversed</tt>, and <tt>:consistency</tt>.
+ # FIXME Not real multi; needs server support
+ def multi_count_columns(column_family, keys, *options)
+
+
+ # Multi-key version of Cassandra#get_columns. Supports the <tt>:consistency</tt>
+ # option.
+ # FIXME Not real multi; needs to use a Column predicate
+ def multi_get_columns(column_family, keys, *options)
+
+ # Return a hash (actually, a Cassandra::OrderedHash) or a single value
+ # representing the element at the column_family:key:[column]:[sub_column]
+ # path you request. Supports options <tt>:count</tt>, <tt>:start</tt>,
+ # <tt>:finish</tt>, <tt>:reversed</tt>, and <tt>:consistency</tt>.
+ def get(column_family, key, *columns_and_options)
+
+ # Multi-key version of Cassandra#get. Supports options <tt>:count</tt>,
+ # <tt>:start</tt>, <tt>:finish</tt>, <tt>:reversed</tt>, and <tt>:consistency</tt>.
+ def multi_get(column_family, keys, *columns_and_options)
+
+ # Return true if the column_family:key:[column]:[sub_column] path you
+ # request exists. Supports the <tt>:consistency</tt> option.
+ def exists?(column_family, key, *columns_and_options)
+
+ # Return a list of keys in the column_family you request. Requires the
+ # table to be partitioned with OrderPreservingHash. Supports the
+ # <tt>:count</tt>, <tt>:start</tt>, <tt>:finish</tt>, and <tt>:consistency</tt>
+ # options.
+ def get_range(column_family, options = {})
+
+ # Count all rows in the column_family you request. Requires the table
+ # to be partitioned with OrderPreservingHash. Supports the <tt>:start</tt>,
+ # <tt>:finish</tt>, and <tt>:consistency</tt> options.
+ def count_range(column_family, options = {})
+
+
+h3. Modifiers
+
+* Consistency level
+* Show tombstones or not
+* range
+
+h4. Thrift Interface
+
+ColumnOrSuperColumn get (string keyspace, string key, ColumnPath column_path, ConsistencyLevel consistency_level)
+i32 get_count (string keyspace, string key, ColumnParent column_parent, ConsistencyLevel consistency_level)
+list<ColumnOrSuperColumn> get_slice (string keyspace, string key, ColumnParent column_parent, SlicePredicate predicate, ConsistencyLevel consistency_level)
+map<string,list<ColumnOrSuperColumn>> multiget_slice (string keyspace, list<string> keys, ColumnParent column_parent, SlicePredicate predicate, ConsistencyLevel consistency_level)
+list<KeySlice> get_range_slices (string keyspace, KeyRange range, ColumnParent column_parent, SlicePredicate predicate, ConsistencyLevel consistency_level)
+void insert (string keyspace, string key, ColumnPath column_path, binary value, i64 timestamp, ConsistencyLevel consistency_level)
+void remove (string keyspace, string key, ColumnPath column_path, i64 timestamp, ConsistencyLevel consistency_level)
+void batch_mutate (string keyspace, map<string,map<string,list<Mutation>>> mutation_map, ConsistencyLevel consistency_level)
+
+
+
+h3. Old Schema
+
+ { "name" : "AccessLevel", "type" : "enum", "symbols" : [ "NONE", "READONLY", "READWRITE", "FALL" ] },
+ { "name" : "ColumnPath", "type" : "record", "fields" : [
+ { "name" : "column_family", "type" : "string"},
+ { "name" : "super_column", "type" : [ "bytes", "null" ]},
+ { "name" : "column", "type" : [ "bytes", "null" ] } ]},
+ { "name" : "ColumnParent", "type" : "record", "fields" : [
+ { "name" : "column_family", "type" : "string"},
+ { "name" : "super_column", "type" : [ "bytes", "null" ] } ]},
+ { "name" : "SliceRange", "type" : "record", "fields" : [
+ { "name" : "start", "type" : "bytes"},
+ { "name" : "finish", "type" : "bytes"},
+ { "name" : "reversed", "type" : "boolean"},
+ { "name" : "count", "type" : "int"},
+ { "name" : "bitmasks", "type" : [ { "type" : "array", "items" : "bytes"}, "null" ] } ]},
+ { "name" : "SlicePredicate", "type" : "record", "fields" : [
+ { "name" : "column_names", "type" : [ { "type" : "array", "items" : "bytes"}, "null" ]},
+ { "name" : "slice_range", "type" : [ "SliceRange", "null" ] } ]},
+
+ { "name" : "Clock", "type" : "record", "fields" : [
+ { "name" : "timestamp", "type" : "long" } ]},
+ { "name" : "Column", "type" : "record", "fields" : [
+ { "name" : "name", "type" : "bytes"},
+ { "name" : "value", "type" : "bytes"},
+ { "name" : "clock", "type" : "Clock"},
+ { "name" : "ttl", "type" : "int" } ]},
+ { "name" : "SuperColumn", "type" : "record", "fields" : [
+ { "name" : "name", "type" : "bytes"},
+ { "name" : "columns", "type" : { "type" : "array", "items" : "Column" } } ]},
+ { "name" : "ColumnOrSuperColumn", "type" : "record", "fields" : [
+ { "name" : "column", "type" : "Column" },
+ { "name" : "super_column", "type" : "null" } ]},
+ { "name" : "Deletion", "type" : "record", "fields" : [
+ { "name" : "clock", "type" : "Clock"},
+ { "name" : "super_column", "type" : [ "bytes", "null" ]},
+ { "name" : "predicate", "type" : [ "SlicePredicate", "null" ] } ]},
+ { "name" : "Mutation", "type" : "record", "fields" : [
+ { "name" : "column_or_supercolumn", "type" : "ColumnOrSuperColumn" },
+ { "name" : "deletion", "type" : "null" } ]},
+ { "name" : "StreamingMutation", "type" : "record", "fields" : [
+ { "name" : "key", "type" : "bytes" },
+ { "name" : "mutation", "type" : "Mutation" } ]},
+
+ { "name" : "IndexType", "type" : "enum", "symbols" : [ "KEYS" ]},
+ { "name" : "ColumnDef", "type" : "record", "fields" : [
+ { "name" : "name", "type" : "bytes"},
+ { "name" : "validation_class", "type" : "string"},
+ { "name" : "index_type", "type" : [ "IndexType", "null" ]},
+ { "name" : "index_name", "type" : [ "string", "null" ] } ]},
+ { "name" : "CfDef", "type" : "record", "fields" : [
+ { "name" : "keyspace", "type" : "string"},
+ { "name" : "name", "type" : "string"},
+ { "name" : "column_type", "type" : [ "string", "null" ]},
+ { "name" : "clock_type", "type" : [ "string", "null" ]},
+ { "name" : "comparator_type", "type" : [ "string", "null" ]},
+ { "name" : "subcomparator_type", "type" : [ "string", "null" ]},
+ { "name" : "reconciler", "type" : [ "string", "null" ]},
+ { "name" : "comment", "type" : [ "string", "null" ]},
+ { "name" : "row_cache_size", "type" : [ "double", "null" ]},
+ { "name" : "preload_row_cache", "type" : [ "boolean", "null" ]},
+ { "name" : "key_cache_size", "type" : [ "double", "null" ]},
+ { "name" : "read_repair_chance", "type" : [ "double", "null" ]},
+ { "name" : "gc_grace_seconds", "type" : [ "int", "null" ]},
+ { "name" : "column_metadata", "type" : [ { "type" : "array", "items" : "ColumnDef"}, "null" ]},
+ { "name" : "id", "type" : [ "int", "null" ] } ]},
+ { "name" : "KsDef", "type" : "record", "fields" : [
+ { "name" : "name", "type" : "string"}, { "name" : "strategy_class", "type" : "string"},
+ { "name" : "strategy_options", "type" : [ { "type" : "map", "values" : "string"}, "null" ]},
+ { "name" : "replication_factor", "type" : "int"}, { "name" : "cf_defs", "type" : { "type" : "array", "items" : "CfDef" } } ]},
+ { "name" : "MutationsMapEntry", "type" : "record", "fields" : [ { "name" : "key", "type" : "bytes"}, { "name" : "mutations", "type" : { "type" : "map", "values" : { "type" : "array", "items" : "Mutation" } } } ]},
+ { "name" : "CoscsMapEntry", "type" : "record", "fields" : [ { "name" : "key", "type" : "bytes"}, { "name" : "columns", "type" : { "type" : "array", "items" : "ColumnOrSuperColumn" } } ]},
+ { "name" : "ConsistencyLevel", "type" : "enum", "symbols" : [ "ZERO", "ONE", "QUORUM", "DCQUORUM", "DCQUORUMSYNC", "ALL" ]},
+ { "name" : "InvalidRequestException", "type" : "error", "fields" : [ { "name" : "why", "type" : [ "string", "null" ] } ]},
+ { "name" : "NotFoundException", "type" : "error", "fields" : [ { "name" : "why", "type" : [ "string", "null" ] } ]},
+ { "name" : "UnavailableException", "type" : "error", "fields" : [ { "name" : "why", "type" : [ "string", "null" ] } ]},
+ { "name" : "TimedOutException", "type" : "error", "fields" : [ { "name" : "why", "type" : [ "string", "null" ] } ] }
+ ],
+
+"messages" : {
+ "get" : {
+ "request" : [ { "name" : "key", "type" : "bytes"},
+ { "name" : "column_path", "type" : "ColumnPath"},
+ { "name" : "consistency_level", "type" : "ConsistencyLevel"
+ } ],
+ "response" : "ColumnOrSuperColumn",
+ "errors" : [ "InvalidRequestException", "NotFoundException", "UnavailableException", "TimedOutException" ]
+ },
+ "get_slice" : {
+ "request" : [ { "name" : "key", "type" : "bytes"},
+ { "name" : "column_parent", "type" : "ColumnParent"},
+ { "name" : "predicate", "type" : "SlicePredicate"},
+ { "name" : "consistency_level", "type" : "ConsistencyLevel"
+ } ],
+ "response" : { "type" : "array", "items" : "ColumnOrSuperColumn" },
+ "errors" : [ "InvalidRequestException", "UnavailableException", "TimedOutException" ]
+ },
+ "multiget_slice" : {
+ "request" : [ { "name" : "keys", "type" : { "type" : "array", "items" : "bytes" }},
+ { "name" : "column_parent", "type" : "ColumnParent"},
+ { "name" : "predicate", "type" : "SlicePredicate"},
+ { "name" : "consistency_level", "type" : "ConsistencyLevel"
+ } ],
+ "response" : { "type" : "array", "items" : "CoscsMapEntry" },
+ "errors" : [ "InvalidRequestException", "UnavailableException", "TimedOutException" ]
+ },
+ "get_count" : {
+ "request" : [ { "name" : "key", "type" : "bytes"},
+ { "name" : "column_parent", "type" : "ColumnParent"},
+ { "name" : "predicate", "type" : "SlicePredicate"},
+ { "name" : "consistency_level", "type" : "ConsistencyLevel"
+ } ],
+ "response" : "int",
+ "errors" : [ "InvalidRequestException", "UnavailableException", "TimedOutException" ]
+ },
+ "insert" : {
+ "request" : [ { "name" : "key", "type" : "bytes"},
+ { "name" : "column_parent", "type" : "ColumnParent"},
+ { "name" : "column", "type" : "Column"},
+ { "name" : "consistency_level", "type" : "ConsistencyLevel"
+ } ],
+ "response" : "null",
+ "errors" : [ "InvalidRequestException", "UnavailableException", "TimedOutException" ]
+ },
+ "remove" : {
+ "request" : [ { "name" : "key", "type" : "bytes"},
+ { "name" : "column_path", "type" : "ColumnPath"},
+ { "name" : "clock", "type" : "Clock"},
+ { "name" : "consistency_level", "type" : "ConsistencyLevel"
+ } ],
+ "response" : "null",
+ "errors" : [ "InvalidRequestException", "UnavailableException", "TimedOutException" ]
+ },
+ "batch_mutate" : {
+ "request" : [ { "name" : "mutation_map", "type" : { "type" : "array", "items" : "MutationsMapEntry" }},
+ { "name" : "consistency_level", "type" : "ConsistencyLevel" } ],
+ "response" : "null",
+ "errors" : [ "InvalidRequestException", "UnavailableException", "TimedOutException" ]
+ },
+ "system_add_keyspace" : {
+ "request" : [ { "name" : "ks_def", "type" : "KsDef"
+ } ],
+ "response" : "null",
+ "errors" : [ "InvalidRequestException" ]
+ },
+ "set_keyspace" : {
+ "request" : [ { "name" : "keyspace", "type" : "string"
+ } ],
+ "response" : "null",
+ "errors" : [ "InvalidRequestException" ]
+ },
+ "describe_keyspaces" : {
+ "request" : [ ],
+ "response" : { "type" : "array", "items" : "string" }
+ },
+ "describe_cluster_name" : {
+ "request" : [ ],
+ "response" : "string"
+ },
+ "describe_version" : {
+ "request" : [ ],
+ "response" : "string"
+ }
+}
+}
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