# Memory usage (Lucene Memory) **URL:** \ **Category:** Elasticsearch\ **Created:** [September 25, 2015, 5:18am UTC](https://discuss.elastic.co/t/memory-usage-lucene-memory/29961 "2015-09-25T05:18:15Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![pavang6](https://avatars.discourse-cdn.com/v4/letter/p/a6a055/32.png) [@pavang6](https://discuss.elastic.co/u/pavang6)\ **Post date:** [September 25, 2015, 5:18am UTC](https://discuss.elastic.co/t/memory-usage-lucene-memory/29961/1 "2015-09-25T05:18:15Z")
Hi , We have two node cluster each node has 32gb memory. One of the node(Master and data node) is using around 85% memory and the other node (only data) is using around 80% memory. On the both the nodes MAX heap size is 16gb. On both the nodes JVM memory doing at 50% around 7gb. We are assuming that rest 16gb on both the nodes is being used by Lucene. We also checked fielddata , filtercache memory they account for 3gb menory. Not sure what else is consuming the rest of the memory. We know 50% is being used by JVM not sure where the rest 50% is being used. When memory hits 85% we restart the nodes and after 9-10 days again memory usage crawls to 85%. I have place few stats below , which may give some clue, Thanks, Pavan Cluster stats { ``` "docs" : { "count" : 12438729, "deleted" : 303455 }, "store" : { "size" : "99.6gb", "size_in_bytes" : 106967522413, "throttle_time" : "3.5h", "throttle_time_in_millis" : 12859587 }, "fielddata" : { "memory_size" : "1.9gb", "memory_size_in_bytes" : 2136445224, "evictions" : 0 }, "filter_cache" : { "memory_size" : "655.9mb", "memory_size_in_bytes" : 687859112, "evictions" : 0 }, "id_cache" : { "memory_size" : "0b", "memory_size_in_bytes" : 0 }, "completion" : { "size" : "0b", "size_in_bytes" : 0 }, "segments" : { "count" : 3549, "memory" : "835.6mb", "memory_in_bytes" : 876224314, "index_writer_memory" : "0b", "index_writer_memory_in_bytes" : 0, "index_writer_max_memory" : "3.2gb", "index_writer_max_memory_in_bytes" : 3440447182, "version_map_memory" : "6.5mb", "version_map_memory_in_bytes" : 6890072, "fixed_bit_set" : "0b", "fixed_bit_set_memory_in_bytes" : 0 }, "percolate" : { "total" : 0, "get_time" : "0s", "time_in_millis" : 0, "current" : 0, "memory_size_in_bytes" : -1, "memory_size" : "-1b", "queries" : 0 } ``` }, "nodes" : { "count" : { "total" : 2, "master\_only" : 0, "data\_only" : 1, "master\_data" : 1, "client" : 0 }, ``` "cpu" : [ { "vendor" : "Intel", "model" : "Xeon", "mhz" : 2600, "total_cores" : 4, "total_sockets" : 1, "cores_per_socket" : 4, "cache_size" : "-1b", "cache_size_in_bytes" : -1, "count" : 2 } ] }, "process" : { "cpu" : { "percent" : 0 }, "open_file_descriptors" : { "min" : 5226, "max" : 5235, "avg" : 5230 } }, "jvm" : { "max_uptime" : "9d", "max_uptime_in_millis" : 785035464, "versions" : [ { "version" : "1.8.0_25", "vm_name" : "Java HotSpot(TM) 64-Bit Server VM", "vm_version" : "25.25-b02", "vm_vendor" : "Oracle Corporation", "count" : 2 } ], "mem" : { "heap_used" : "16gb", "heap_used_in_bytes" : 17202867568, "heap_max" : "31.9gb", "heap_max_in_bytes" : 34290008064 }, "threads" : 151 }, "fs" : { "total" : "399.7gb", "total_in_bytes" : 429224091648, "free" : "200.4gb", "free_in_bytes" : 215275565056, "available" : "200.4gb", "available_in_bytes" : 215275565056, "disk_reads" : 9841894, "disk_writes" : 348214185, "disk_io_op" : 358056079, "disk_read_size" : "3.6gb", "disk_read_size_in_bytes" : 3952797184, "disk_write_size" : "5.4gb", "disk_write_size_in_bytes" : 5829136384, "disk_io_size" : "9.1gb", "disk_io_size_in_bytes" : 9781933568, "disk_queue" : "0" }, "plugins" : [ { "name" : "head", "version" : "NA", "description" : "No description found.", "url" : "/_plugin/head/", "jvm" : false, "site" : true } ] ``` } } * * * ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [September 25, 2015, 5:20am UTC](https://discuss.elastic.co/t/memory-usage-lucene-memory/29961/2 "2015-09-25T05:20:35Z")
Are you talking heap size or OS memory stats? ---
**Author:** ![pavang6](https://avatars.discourse-cdn.com/v4/letter/p/a6a055/32.png) [@pavang6](https://discuss.elastic.co/u/pavang6)\ **Post date:** [September 25, 2015, 5:22am UTC](https://discuss.elastic.co/t/memory-usage-lucene-memory/29961/3 "2015-09-25T05:22:19Z")
Hi thanks for the reply, This is about overall OS memory our heap memory is doing good its around 50% but the OS memory is 85%. Thanks, Pavan ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [September 25, 2015, 5:23am UTC](https://discuss.elastic.co/t/memory-usage-lucene-memory/29961/4 "2015-09-25T05:23:14Z")
Basically this is the OS caching files that ES/Lucene is opening. Is it a problem or are you just interested? ---
**Author:** ![pavang6](https://avatars.discourse-cdn.com/v4/letter/p/a6a055/32.png) [@pavang6](https://discuss.elastic.co/u/pavang6)\ **Post date:** [September 25, 2015, 5:24am UTC](https://discuss.elastic.co/t/memory-usage-lucene-memory/29961/5 "2015-09-25T05:24:11Z")
It is a problem as the server memory is nearing 100%. Thanks, Pavan ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [September 25, 2015, 5:30am UTC](https://discuss.elastic.co/t/memory-usage-lucene-memory/29961/6 "2015-09-25T05:30:07Z")
It's not a problem though, the OS will handle it and release memory for other things as it needs. There's a number of other threads on this exact thing, I'd encourage you to have a look around. ---
**Author:** ![pavang6](https://avatars.discourse-cdn.com/v4/letter/p/a6a055/32.png) [@pavang6](https://discuss.elastic.co/u/pavang6)\ **Post date:** [September 25, 2015, 5:33am UTC](https://discuss.elastic.co/t/memory-usage-lucene-memory/29961/7 "2015-09-25T05:33:56Z")
Hi Mark , thanks for the reply. i would be looking at other threads. Could you please mention any relevant thread if you remember. Thanks again, Pavan ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 5, 2017, 11:48pm UTC](https://discuss.elastic.co/t/memory-usage-lucene-memory/29961/8 "2017-07-05T23:48:08Z")