CODEWITHSUNDEEP
cassandra
alnasfire
alnasfire

Reputation: 720

Cassandra configs

Recently I began to study Cassandra. Please help me understand what effect these settings (I need your interpretation, I read the file cassandra.yaml):

  1. memtable_flush_writers
  2. memtable_flush_queue_size
  3. thrift_framed_transport_size_in_mb
  4. in_memory_compaction_limit_in_mb
  5. slised_buffer_size_in_kb
  6. thrift_max_message_length_in_mb
  7. binary_memtable_throughput_in_mb
  8. column_index_size_in_kb

Upvotes: 1

Views: 1576

Answers (1)

Abhinandan Satpute
Abhinandan Satpute

Reputation: 2678

I know it's very late to answer.But I am answering it as it might help someone else.

The most of the parameters you have mentioned above are related to the Cassandra write operation.

memtable_flush_writers : It Sets the number of memtable flush writer threads. These threads are blocked by disk I/O, and each one holds a memtable in memory while blocked. If your data directories are backed by SSD, increase this setting to the number of cores.

memtable_flush_queue_size : The number of full memtables to allow pending flush (memtables waiting for a write thread). At a minimum, set to the maximum number of indexes created on a single table

in_memory_compaction_limit_in_mb : Size limit for rows being compacted in memory. Larger rows spill to disk and use a slower two-pass compaction process. When this occurs, a message is logged specifying the row key. The recommended value is 5 to 10 percent of the available Java heap size.

thrift_framed_transport_size_in_mb : Frame size (maximum field length) for Thrift. The frame is the row or part of the row that the application is inserting.

thrift_max_message_length_in_mb: The maximum length of a Thrift message in megabytes, including all fields and internal Thrift overhead (1 byte of overhead for each frame). Message length is usually used in conjunction with batches. A frame length greater than or equal to 24 accommodates a batch with four inserts, each of which is 24 bytes. The required message length is greater than or equal to 24+24+24+24+4 (number of frames).

You can find more details at Datastax Cassandra documentation

Upvotes: 5

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