Study of Dynamic Settings in ElasticSearch 0.90.0.Beta1

DynamicSettings-study.md

Dynamic Settings in ElasticSearch 0.90.0.Beta1

Sources of dynamic settings

• org.elasticsearch.index.settings.IndexDynamicSettingsModule
• org.elasticsearch.cluster.settings.ClusterDynamicSettingsModule
• org.elasticsearch.node.settings.NodeSettingsService.Listener

Cluster settings

• cluster.routing.allocation.awareness.attributes
• cluster.routing.allocation.awareness.force.*
• cluster.routing.allocation.balance.index
• cluster.routing.allocation.balance.shard
• cluster.routing.allocation.balance.primary
• cluster.routing.allocation.balance.threshold
• cluster.routing.allocation.cluster_concurrent_rebalance
• cluster.routing.allocation.disable_new_allocation
• cluster.routing.allocation.disable_allocation
• cluster.routing.allocation.disable_replica_allocation
• discovery.zen.minimum_master_nodes
• cluster.routing.allocation.require.*
• cluster.routing.allocation.include.*
• cluster.routing.allocation.exclude.*
• indices.cache.filter.size
• indices.cache.filter.expire
• indices.store.throttle.type
• indices.store.throttle.max_bytes_per_sec
• indices.ttl.interval
• cluster.blocks.read_only
• indices.recovery.file_chunk_size
• indices.recovery.translog_ops
• indices.recovery.translog_size
• indices.recovery.compress
• indices.recovery.concurrent_streams
• indices.recovery.max_size_per_sec
• threadpool.*
• cluster.routing.allocation.node_initial_primaries_recoveries
• cluster.routing.allocation.node_concurrent_recoveries

Index settings

• index.store.throttle.max_bytes_per_sec
• index.store.throttle.type
• index.routing.allocation.require.*
• index.routing.allocation.include.*
• index.routing.allocation.exclude.*
• index.translog.fs.type
• index.translog.fs.buffer_size
• index.translog.fs.transient_buffer_size
• index.number_of_replicas
• index.auto_expand_replicas
• index.blocks.read_only
• index.blocks.read
• index.blocks.write
• index.blocks.metadata
• index.gateway.snapshot_interval
• index.ttl.disable_purge
• index.refresh_interval
• index.recovery.initial_shards
• index.merge.policy.min_merge_size
• index.merge.policy.max_merge_size
• index.merge.policy.max_merge_docs
• index.merge.policy.merge_factor
• index.compound_format
• index.merge.policy.min_merge_docs
• index.merge.policy.max_merge_docs
• index.merge.policy.merge_factor
• index.compound_format
• index.term_index_interval
• index.term_index_divisor
• index.index_concurrency
• index.gc_deletes
• index.codec
• index.indexing.slowlog.threshold.index.warn
• index.indexing.slowlog.threshold.index.info
• index.indexing.slowlog.threshold.index.debug
• index.indexing.slowlog.threshold.index.trace
• index.indexing.slowlog.reformat
• index.indexing.slowlog.level
• index.search.slowlog.threshold.query.warn
• index.search.slowlog.threshold.query.info
• index.search.slowlog.threshold.query.debug
• index.search.slowlog.threshold.query.trace
• index.search.slowlog.threshold.fetch.warn
• index.search.slowlog.threshold.fetch.info
• index.search.slowlog.threshold.fetch.debug
• index.search.slowlog.threshold.fetch.trace
• index.search.slowlog.reformat
• index.search.slowlog.level
• index.routing.allocation.total_shards_per_node
• index.merge.policy.expunge_deletes_allowed
• index.merge.policy.floor_segment
• index.merge.policy.max_merge_at_once
• index.merge.policy.max_merge_at_once_explicit
• index.merge.policy.max_merged_segment
• index.merge.policy.segments_per_tier
• index.merge.policy.reclaim_deletes_weight
• index.compound_format
• index.translog.flush_threshold_ops
• index.translog.flush_threshold_size
• index.translog.flush_threshold_period
• index.translog.disable_flush

Node settings

• cluster.routing.allocation.balance.threshold
• cluster.routing.allocation.balance.index
• cluster.routing.allocation.balance.shard
• cluster.routing.allocation.balance.primary
• cluster.routing.allocation.awareness.attributes
• cluster.routing.allocation.awareness.force.*
• cluster.routing.allocation.cluster_concurrent_rebalance
• cluster.routing.allocation.disable_new_allocation
• cluster.routing.allocation.disable_allocation
• cluster.routing.allocation.disable_replica_allocation
• cluster.routing.allocation.require.*
• cluster.routing.allocation.include.*
• cluster.routing.allocation.exclude.*
• cluster.routing.allocation.node_initial_primaries_recoveries
• cluster.routing.allocation.node_concurrent_recoveries
• discovery.zen.minimum_master_nodes
• indices.cache.filter.size
• indices.cache.filter.expire
• indices.recovery.file_chunk_size
• indices.recovery.translog_ops
• indices.recovery.translog_size
• indices.recovery.compress
• indices.recovery.concurrent_streams
• indices.recovery.max_size_per_sec
• indices.store.throttle.type
• indices.store.throttle.max_bytes_per_sec
• indices.ttl.interval
• threadpool.*

Other

Some classes read a setting from index metadata before use:

// src/main/java/org/elasticsearch/indices/ttl/IndicesTTLService#getShardsToPurge()
MetaData metaData = clusterService.state().metaData();
IndexMetaData indexMetaData = metaData.index(indexService.index().name());
boolean disablePurge = indexMetaData.settings().getAsBoolean(INDEX_TTL_DISABLE_PURGE, false);

Settings that could be dynamic

• node.CUSTOM_ATTRIBUTE
• cluster.name
• node.name
• node.master
• transport.tcp.compress
• http.max_content_length
• discovery.zen.ping.timeout
• discovery.zen.ping.multicast.enabled
• discovery.zen.ping.unicast.hosts