For example, if you have a resident filter cache configured and there is heap congestion, clear cache may temporarily help to release objects back to the JVM. After a while they are GCed.
Usually, in most other cases, cached objects are GCed when memory becomes low, so there is not much to worry about clearing cache by command. Jörg On Fri, Mar 21, 2014 at 8:19 AM, Gary Gao <[email protected]> wrote: > So, What is Clear Cache API for ? > > > On Wed, Mar 19, 2014 at 9:22 PM, [email protected] < > [email protected]> wrote: > >> JVM heap objects are reclaimed by garbage collection, not by clear cache >> command. >> >> Jörg >> >> >> On Wed, Mar 19, 2014 at 4:17 AM, Gary Gao <[email protected]> wrote: >> >>> Hi, >>> I have a total 8GB of JVM Heap, it't usage was near 50%, >>> While I cleared field data cache（almost 1GB） using Clear Cache API: >>> $curl -XPOST 'http://localhost:9200/_cache/ >>> clear?field_data=true' >>> field data cahced size decreased, indeed, but JVM heap usage >>> didn't declined. >>> What's the reasons ? >>> >>> >>> >>> -- >>> 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 [email protected]. >>> >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/elasticsearch/5e4a1e94-d6f0-4069-9d62-481c5a974f2c%40googlegroups.com<https://groups.google.com/d/msgid/elasticsearch/5e4a1e94-d6f0-4069-9d62-481c5a974f2c%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- >> 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/PWbqlVw9OEE/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/elasticsearch/CAKdsXoGnmE44ikZb03Km-nr9CKwL%2BMuOjQvQ1LD0XLf0ZxuAbA%40mail.gmail.com<https://groups.google.com/d/msgid/elasticsearch/CAKdsXoGnmE44ikZb03Km-nr9CKwL%2BMuOjQvQ1LD0XLf0ZxuAbA%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> >> For more options, visit 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 [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/elasticsearch/CAAgk9rx2t8pDJ86Nwd0t6zE_DLKhupB8TZcoRG7khufucWfGAA%40mail.gmail.com<https://groups.google.com/d/msgid/elasticsearch/CAAgk9rx2t8pDJ86Nwd0t6zE_DLKhupB8TZcoRG7khufucWfGAA%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > For more options, visit 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/elasticsearch/CAKdsXoEYBZQkEc%2BU6YUysHrB3c%2B4bDq-QCV4GO%3DbHCKncykx_A%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
