# Single low memory data node impact whole cluster **URL:** \ **Category:** Elasticsearch\ **Created:** [February 7, 2015, 1:55am UTC](https://discuss.elastic.co/t/single-low-memory-data-node-impact-whole-cluster/22019 "2015-02-07T01:55:24Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![liu\_wei](https://avatars.discourse-cdn.com/v4/letter/l/cab0a1/32.png) [@liu\_wei](https://discuss.elastic.co/u/liu_wei)\ **Post date:** [February 7, 2015, 1:55am UTC](https://discuss.elastic.co/t/single-low-memory-data-node-impact-whole-cluster/22019/1 "2015-02-07T01:55:24Z")
Hi, We recently had a few incidents where a single index with low memory is impacting the entire cluster. All the cluster related APIs are not responding. Kibana 3 and 4 are failing to load too. From log it seems it's doing GC and not responding to any requests. And there's no log between 2:29 to 4:07 where i restarted the node. Is there anyway to make this more resilient? _[2015-02-05 14:29:17,199][INFO][monitor.jvm] [Big Wheel] [gc][young][78379][36567] duration [864ms], collections [1]/[1.7s], total [864ms]/[1.4h], memory [15.2gb]-\>[14.6gb]/[19.9gb], all\_pools {[young] [599.8mb]-\>[2.8mb]/[665.6mb]}{[survivor] [75.6mb]-\>[83.1mb]/[83.1mb]}{[old] [14.5gb]-\>[14.5gb]/[19.1gb]}_ _[2015-02-05 14:29:23,302][WARN][monitor.jvm] [Big Wheel] [gc][young][78384][36568] duration [1.4s], collections [1]/[2s], total [1.4s]/[1.4h], memory [15.1gb]-\>[14.7gb]/[19.9gb], all\_pools {[young] [459.7mb]-\>[15.7mb]/[665.6mb]}{[survivor] [83.1mb]-\>[83.1mb]/[83.1mb]}{[old] [14.5gb]-\>[14.6gb]/[19.1gb]}_ _[2015-02-05 14:29:34,990][INFO][monitor.jvm] [Big Wheel] [gc][young][78395][36571] duration [900ms], collections [1]/[1.4s], total [900ms]/[1.4h], memory [15.1gb]-\>[14.6gb]/[19.9gb], all\_pools {[young] [484.9mb]-\>[3.9mb]/[665.6mb]}{[survivor] [71.7mb]-\>[52.4mb]/[83.1mb]}{[old] [14.6gb]-\>[14.6gb]/[19.1gb]}_ _[2015-02-05 14:29:45,055_\*][WARN][monitor.jvm] [Big Wheel] [gc][young][78404][36574] duration [1.2s], collections [1]/[2s], total [1.2s]/[1.4h], memory [15.1gb]-\>[14.7gb]/[19.9gb], all\_pools {[young] [472.8mb]-\>[2.9mb]/[665.6mb]}{[survivor] [83.1mb]-\>[67.6mb]/[83.1mb]}{[old] [14.6gb]-\>[14.6gb]/[19.1gb]}\* \*[2015-02-05 16:07:15,509][\*_INFO][node] [Pyro] version[1.4.2], pid[9796], build[927caff/2014-12-16T14:11:12Z]_ _[2015-02-05 16:07:15,510][INFO][node] [Pyro] initializing ..._ _[2015-02-05 16:07:15,638][INFO][plugins] [Pyro] loaded [marvel, cloud-azure], sites [marvel, kopf]_ _[2015-02-05 16:07:24,844][INFO][node] [Pyro] initialized_ _[2015-02-05 16:07:24,845][INFO][node] [Pyro] starting ..._ -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/39c89f64-8614-4c4d-bef4-420a5a9eae46%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/39c89f64-8614-4c4d-bef4-420a5a9eae46%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![jpountz](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jpountz/32/45836_2.png) [@jpountz](https://discuss.elastic.co/u/jpountz)\ **Post date:** [February 8, 2015, 7:11pm UTC](https://discuss.elastic.co/t/single-low-memory-data-node-impact-whole-cluster/22019/2 "2015-02-08T19:11:46Z")
Indeed JVMs sometimes need to "stop the world" in case of memory pressure. You might find some advices about GC tuning here or there but these but I would advise to avoid it as it is very hard to evaluate the impact of these settings. If this issue happens on a regular basis, it might mean that your cluster is undersized and should be given more memory so that the JVM doesn't have to run full GCs so often. Otherwise, you should look at how you could modify elasticsearch's configuration in order to load less stuff in memory (such as using doc values for fielddata). Another option is to run two nodes instead of one per machine (with half the memory). Given that full gcs are shorter on small heaps, this should limit the issue. On Sat, Feb 7, 2015 at 2:55 AM, liu wei [liu.liuwei.wei@gmail.com](mailto:liu.liuwei.wei@gmail.com) wrote: > Hi, > > We recently had a few incidents where a single index with low memory is > impacting the entire cluster. All the cluster related APIs are not > responding. Kibana 3 and 4 are failing to load too. From log it seems it's > doing GC and not responding to any requests. And there's no log between > 2:29 to 4:07 where i restarted the node. Is there anyway to make this more > resilient? > > _[2015-02-05 14:29:17,199][INFO][monitor.jvm] [Big Wheel] > [gc][young][78379][36567] duration [864ms], collections [1]/[1.7s], total > [864ms]/[1.4h], memory [15.2gb]-\>[14.6gb]/[19.9gb], all\_pools {[young] > [599.8mb]-\>[2.8mb]/[665.6mb]}{[survivor] [75.6mb]-\>[83.1mb]/[83.1mb]}{[old] > [14.5gb]-\>[14.5gb]/[19.1gb]}_ > > _[2015-02-05 14:29:23,302][WARN][monitor.jvm] [Big Wheel] > [gc][young][78384][36568] duration [1.4s], collections [1]/[2s], total > [1.4s]/[1.4h], memory [15.1gb]-\>[14.7gb]/[19.9gb], all\_pools {[young] > [459.7mb]-\>[15.7mb]/[665.6mb]}{[survivor] > [83.1mb]-\>[83.1mb]/[83.1mb]}{[old] [14.5gb]-\>[14.6gb]/[19.1gb]}_ > > _[2015-02-05 14:29:34,990][INFO][monitor.jvm] [Big Wheel] > [gc][young][78395][36571] duration [900ms], collections [1]/[1.4s], total > [900ms]/[1.4h], memory [15.1gb]-\>[14.6gb]/[19.9gb], all\_pools {[young] > [484.9mb]-\>[3.9mb]/[665.6mb]}{[survivor] [71.7mb]-\>[52.4mb]/[83.1mb]}{[old] > [14.6gb]-\>[14.6gb]/[19.1gb]}_ > > _[2015-02-05 14:29:45,055_\*][WARN][monitor.jvm] [Big > Wheel] [gc][young][78404][36574] duration [1.2s], collections [1]/[2s], > total [1.2s]/[1.4h], memory [15.1gb]-\>[14.7gb]/[19.9gb], all\_pools {[young] > [472.8mb]-\>[2.9mb]/[665.6mb]}{[survivor] [83.1mb]-\>[67.6mb]/[83.1mb]}{[old] > [14.6gb]-\>[14.6gb]/[19.1gb]}\* > > \*[2015-02-05 16:07:15,509][\*_INFO][node] [Pyro] > version[1.4.2], pid[9796], build[927caff/2014-12-16T14:11:12Z]_ > > _[2015-02-05 16:07:15,510][INFO][node] [Pyro] > initializing ..._ > > _[2015-02-05 16:07:15,638][INFO][plugins] [Pyro] loaded > [marvel, cloud-azure], sites [marvel, kopf]_ > > _[2015-02-05 16:07:24,844][INFO][node] [Pyro] > initialized_ > > _[2015-02-05 16:07:24,845][INFO][node] [Pyro] > starting ..._ > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/39c89f64-8614-4c4d-bef4-420a5a9eae46%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/39c89f64-8614-4c4d-bef4-420a5a9eae46%40googlegroups.com) > [https://groups.google.com/d/msgid/elasticsearch/39c89f64-8614-4c4d-bef4-420a5a9eae46%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/39c89f64-8614-4c4d-bef4-420a5a9eae46%40googlegroups.com?utm_medium=email&utm_source=footer) > . > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- Adrien Grand -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAL6Z4j7VWW%3DB9hYsR95yHT1fcPyna29c9KrOOWcpV\_qwEDkUUQ%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAL6Z4j7VWW%3DB9hYsR95yHT1fcPyna29c9KrOOWcpV_qwEDkUUQ%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![liu\_wei](https://avatars.discourse-cdn.com/v4/letter/l/cab0a1/32.png) [@liu\_wei](https://discuss.elastic.co/u/liu_wei)\ **Post date:** [February 13, 2015, 3:41am UTC](https://discuss.elastic.co/t/single-low-memory-data-node-impact-whole-cluster/22019/3 "2015-02-13T03:41:54Z")
Thanks for the reply. Today the problem happened again. A bad node stop responding and bring down the whole cluster. But this time memory is ok. Here are some details. 1. Again, management APIs such as \_node, cat are not returning. Default the default 9200 response. If I directly hit the master node, default 9200 is returning 200. But the other APIs are not working. 2. No out of memory exception. We set HEAP at 20GB, the but the usage is about 15GB only. ( Could it be because of this? Machine is 32GB memory) 3. I restarted a couple of high memory nodes, and master too, still not recovering. Until I found on some master node logs pointing to a node saying operation cannot be executed on bad node. 4. Again, the bad node's log is missing an entire time period since a couple of hours ago. And in Marvel, the node stopped reporting status around the same time too. Didn't see anything suspicious on Marvel events though. Unlike the first time, there's no obvious problem(didn't see GC log) except some index operation failing. And this time I checked the field\_data size too, it's not big, around 1GB only. What can i do to pinpoint what's going on? On Sun, Feb 8, 2015 at 11:11 AM, Adrien Grand \< [adrien.grand@elasticsearch.com](mailto:adrien.grand@elasticsearch.com)\> wrote: > Indeed JVMs sometimes need to "stop the world" in case of memory pressure. > You might find some advices about GC tuning here or there but these but I > would advise to avoid it as it is very hard to evaluate the impact of these > settings. > > If this issue happens on a regular basis, it might mean that your cluster > is undersized and should be given more memory so that the JVM doesn't have > to run full GCs so often. Otherwise, you should look at how you could > modify elasticsearch's configuration in order to load less stuff in memory > (such as using doc values for fielddata). Another option is to run two > nodes instead of one per machine (with half the memory). Given that full > gcs are shorter on small heaps, this should limit the issue. > > On Sat, Feb 7, 2015 at 2:55 AM, liu wei [liu.liuwei.wei@gmail.com](mailto:liu.liuwei.wei@gmail.com) wrote: > > > Hi, > > > > We recently had a few incidents where a single index with low memory is > > impacting the entire cluster. All the cluster related APIs are not > > responding. Kibana 3 and 4 are failing to load too. From log it seems it's > > doing GC and not responding to any requests. And there's no log between > > 2:29 to 4:07 where i restarted the node. Is there anyway to make this more > > resilient? > > > > _[2015-02-05 14:29:17,199][INFO][monitor.jvm] [Big Wheel] > > [gc][young][78379][36567] duration [864ms], collections [1]/[1.7s], total > > [864ms]/[1.4h], memory [15.2gb]-\>[14.6gb]/[19.9gb], all\_pools {[young] > > [599.8mb]-\>[2.8mb]/[665.6mb]}{[survivor] [75.6mb]-\>[83.1mb]/[83.1mb]}{[old] > > [14.5gb]-\>[14.5gb]/[19.1gb]}_ > > > > _[2015-02-05 14:29:23,302][WARN][monitor.jvm] [Big Wheel] > > [gc][young][78384][36568] duration [1.4s], collections [1]/[2s], total > > [1.4s]/[1.4h], memory [15.1gb]-\>[14.7gb]/[19.9gb], all\_pools {[young] > > [459.7mb]-\>[15.7mb]/[665.6mb]}{[survivor] > > [83.1mb]-\>[83.1mb]/[83.1mb]}{[old] [14.5gb]-\>[14.6gb]/[19.1gb]}_ > > > > _[2015-02-05 14:29:34,990][INFO][monitor.jvm] [Big Wheel] > > [gc][young][78395][36571] duration [900ms], collections [1]/[1.4s], total > > [900ms]/[1.4h], memory [15.1gb]-\>[14.6gb]/[19.9gb], all\_pools {[young] > > [484.9mb]-\>[3.9mb]/[665.6mb]}{[survivor] [71.7mb]-\>[52.4mb]/[83.1mb]}{[old] > > [14.6gb]-\>[14.6gb]/[19.1gb]}_ > > > > _[2015-02-05 14:29:45,055_\*][WARN][monitor.jvm] [Big > > Wheel] [gc][young][78404][36574] duration [1.2s], collections [1]/[2s], > > total [1.2s]/[1.4h], memory [15.1gb]-\>[14.7gb]/[19.9gb], all\_pools {[young] > > [472.8mb]-\>[2.9mb]/[665.6mb]}{[survivor] [83.1mb]-\>[67.6mb]/[83.1mb]}{[old] > > [14.6gb]-\>[14.6gb]/[19.1gb]}\* > > > > \*[2015-02-05 16:07:15,509][\*_INFO][node] [Pyro] > > version[1.4.2], pid[9796], build[927caff/2014-12-16T14:11:12Z]_ > > > > _[2015-02-05 16:07:15,510][INFO][node] [Pyro] > > initializing ..._ > > > > _[2015-02-05 16:07:15,638][INFO][plugins] [Pyro] > > loaded [marvel, cloud-azure], sites [marvel, kopf]_ > > > > _[2015-02-05 16:07:24,844][INFO][node] [Pyro] > > initialized_ > > > > _[2015-02-05 16:07:24,845][INFO][node] [Pyro] > > starting ..._ > > > > -- > > You received this message because you are subscribed to the Google Groups > > "elasticsearch" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > > To view this discussion on the web visit > > [https://groups.google.com/d/msgid/elasticsearch/39c89f64-8614-4c4d-bef4-420a5a9eae46%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/39c89f64-8614-4c4d-bef4-420a5a9eae46%40googlegroups.com) > > [https://groups.google.com/d/msgid/elasticsearch/39c89f64-8614-4c4d-bef4-420a5a9eae46%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/39c89f64-8614-4c4d-bef4-420a5a9eae46%40googlegroups.com?utm_medium=email&utm_source=footer) > > . > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). > > -- > Adrien Grand > > -- > You received this message because you are subscribed to a topic in the > Google Groups "elasticsearch" group. > To unsubscribe from this topic, visit > [https://groups.google.com/d/topic/elasticsearch/O9pkFK5eMJ0/unsubscribe](https://groups.google.com/d/topic/elasticsearch/O9pkFK5eMJ0/unsubscribe). > To unsubscribe from this group and all its topics, send an email to > [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/CAL6Z4j7VWW%3DB9hYsR95yHT1fcPyna29c9KrOOWcpV\_qwEDkUUQ%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAL6Z4j7VWW%3DB9hYsR95yHT1fcPyna29c9KrOOWcpV_qwEDkUUQ%40mail.gmail.com) > [https://groups.google.com/d/msgid/elasticsearch/CAL6Z4j7VWW%3DB9hYsR95yHT1fcPyna29c9KrOOWcpV\_qwEDkUUQ%40mail.gmail.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/CAL6Z4j7VWW%3DB9hYsR95yHT1fcPyna29c9KrOOWcpV_qwEDkUUQ%40mail.gmail.com?utm_medium=email&utm_source=footer) > . > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAFzuQNRnXr3nq-tfGtq4zoJpYPr2A7dxP%2B2CiEFgwsLR9A%2BS-w%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAFzuQNRnXr3nq-tfGtq4zoJpYPr2A7dxP%2B2CiEFgwsLR9A%2BS-w%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**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:** [February 16, 2015, 8:41am UTC](https://discuss.elastic.co/t/single-low-memory-data-node-impact-whole-cluster/22019/4 "2015-02-16T08:41:40Z")
Try looking into hot\_threads? On 13 February 2015 at 14:41, liu wei [liu.liuwei.wei@gmail.com](mailto:liu.liuwei.wei@gmail.com) wrote: > Thanks for the reply. Today the problem happened again. A bad node stop > responding and bring down the whole cluster. But this time memory is ok. > Here are some details. > > 1. Again, management APIs such as \_node, cat are not returning. Default > the default 9200 response. If I directly hit the master node, default 9200 > is returning 200. But the other APIs are not working. > 2. No out of memory exception. We set HEAP at 20GB, the but the usage is > about 15GB only. ( Could it be because of this? Machine is 32GB memory) > 3. I restarted a couple of high memory nodes, and master too, still not > recovering. Until I found on some master node logs pointing to a node > saying operation cannot be executed on bad node. > 4. Again, the bad node's log is missing an entire time period since a > couple of hours ago. And in Marvel, the node stopped reporting status > around the same time too. Didn't see anything suspicious on Marvel events > though. Unlike the first time, there's no obvious problem(didn't see GC > log) except some index operation failing. And this time I checked the > field\_data size too, it's not big, around 1GB only. > > What can i do to pinpoint what's going on? > > On Sun, Feb 8, 2015 at 11:11 AM, Adrien Grand \< > [adrien.grand@elasticsearch.com](mailto:adrien.grand@elasticsearch.com)\> wrote: > > > Indeed JVMs sometimes need to "stop the world" in case of memory > > pressure. You might find some advices about GC tuning here or there but > > these but I would advise to avoid it as it is very hard to evaluate the > > impact of these settings. > > > > If this issue happens on a regular basis, it might mean that your cluster > > is undersized and should be given more memory so that the JVM doesn't have > > to run full GCs so often. Otherwise, you should look at how you could > > modify elasticsearch's configuration in order to load less stuff in memory > > (such as using doc values for fielddata). Another option is to run two > > nodes instead of one per machine (with half the memory). Given that full > > gcs are shorter on small heaps, this should limit the issue. > > > > On Sat, Feb 7, 2015 at 2:55 AM, liu wei [liu.liuwei.wei@gmail.com](mailto:liu.liuwei.wei@gmail.com) wrote: > > > > > Hi, > > > > > > We recently had a few incidents where a single index with low memory is > > > impacting the entire cluster. All the cluster related APIs are not > > > responding. Kibana 3 and 4 are failing to load too. From log it seems it's > > > doing GC and not responding to any requests. And there's no log between > > > 2:29 to 4:07 where i restarted the node. Is there anyway to make this more > > > resilient? > > > > > > _[2015-02-05 14:29:17,199][INFO][monitor.jvm] [Big Wheel] > > > [gc][young][78379][36567] duration [864ms], collections [1]/[1.7s], total > > > [864ms]/[1.4h], memory [15.2gb]-\>[14.6gb]/[19.9gb], all\_pools {[young] > > > [599.8mb]-\>[2.8mb]/[665.6mb]}{[survivor] [75.6mb]-\>[83.1mb]/[83.1mb]}{[old] > > > [14.5gb]-\>[14.5gb]/[19.1gb]}_ > > > > > > _[2015-02-05 14:29:23,302][WARN][monitor.jvm] [Big Wheel] > > > [gc][young][78384][36568] duration [1.4s], collections [1]/[2s], total > > > [1.4s]/[1.4h], memory [15.1gb]-\>[14.7gb]/[19.9gb], all\_pools {[young] > > > [459.7mb]-\>[15.7mb]/[665.6mb]}{[survivor] > > > [83.1mb]-\>[83.1mb]/[83.1mb]}{[old] [14.5gb]-\>[14.6gb]/[19.1gb]}_ > > > > > > _[2015-02-05 14:29:34,990][INFO][monitor.jvm] [Big Wheel] > > > [gc][young][78395][36571] duration [900ms], collections [1]/[1.4s], total > > > [900ms]/[1.4h], memory [15.1gb]-\>[14.6gb]/[19.9gb], all\_pools {[young] > > > [484.9mb]-\>[3.9mb]/[665.6mb]}{[survivor] [71.7mb]-\>[52.4mb]/[83.1mb]}{[old] > > > [14.6gb]-\>[14.6gb]/[19.1gb]}_ > > > > > > _[2015-02-05 14:29:45,055_\*][WARN][monitor.jvm] [Big > > > Wheel] [gc][young][78404][36574] duration [1.2s], collections [1]/[2s], > > > total [1.2s]/[1.4h], memory [15.1gb]-\>[14.7gb]/[19.9gb], all\_pools {[young] > > > [472.8mb]-\>[2.9mb]/[665.6mb]}{[survivor] [83.1mb]-\>[67.6mb]/[83.1mb]}{[old] > > > [14.6gb]-\>[14.6gb]/[19.1gb]}\* > > > > > > \*[2015-02-05 16:07:15,509][\*_INFO][node] [Pyro] > > > version[1.4.2], pid[9796], build[927caff/2014-12-16T14:11:12Z]_ > > > > > > _[2015-02-05 16:07:15,510][INFO][node] [Pyro] > > > initializing ..._ > > > > > > _[2015-02-05 16:07:15,638][INFO][plugins] [Pyro] > > > loaded [marvel, cloud-azure], sites [marvel, kopf]_ > > > > > > _[2015-02-05 16:07:24,844][INFO][node] [Pyro] > > > initialized_ > > > > > > _[2015-02-05 16:07:24,845][INFO][node] [Pyro] > > > starting ..._ > > > > > > -- > > > You received this message because you are subscribed to the Google > > > Groups "elasticsearch" group. > > > To unsubscribe from this group and stop receiving emails from it, send > > > an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > > > To view this discussion on the web visit > > > [https://groups.google.com/d/msgid/elasticsearch/39c89f64-8614-4c4d-bef4-420a5a9eae46%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/39c89f64-8614-4c4d-bef4-420a5a9eae46%40googlegroups.com) > > > [https://groups.google.com/d/msgid/elasticsearch/39c89f64-8614-4c4d-bef4-420a5a9eae46%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/39c89f64-8614-4c4d-bef4-420a5a9eae46%40googlegroups.com?utm_medium=email&utm_source=footer) > > > . > > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). > > > > -- > > Adrien Grand > > > > -- > > You received this 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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 12:32am UTC](https://discuss.elastic.co/t/single-low-memory-data-node-impact-whole-cluster/22019/5 "2017-07-06T00:32:33Z")