Thanks for answering my questions. I also followed all these interesting reading and learned a lot. Cheers, Jack
Jinyuan (Jack) Zhou On Wed, Sep 3, 2014 at 10:02 AM, Ivan Brusic <[email protected]> wrote: > The actual limitation in Java is compressed pointers: > > > http://docs.oracle.com/javase/7/docs/technotes/guides/vm/performance-enhancements-7.html#compressedOop > > Thankfully Elasticsearch can run multiple nodes on the same server. Just > pay attention to the direct size (off heap memory), mlockall settings and > Lucene merge settings, as well as the allocation property referenced by > David. Elasticsearch scales quite nicely vertically, so I would explore > that option if possible. > > Cheers, > > Ivan > > > On Wed, Sep 3, 2014 at 9:40 AM, vineeth mohan <[email protected]> > wrote: > >> Hi , >> >> I am not sure if there is anything related to ES that makes a high RAM >> problematic , but in general very high memory is not advised in java >> systems. One of the reasons being the cobra effect which stems from the >> fact that garbage collection might need more time for higher memory. >> >> COBRA EFFECT - >> https://plumbr.eu/blog/increasing-heap-size-beware-of-the-cobra-effect >> >> Thanks >> Vineeth >> >> >> On Wed, Sep 3, 2014 at 10:04 PM, Jinyuan Zhou <[email protected]> >> wrote: >> >>> I read somewhere that the ES_HEAP_SIZE is best to be less than 31G, in >>> this case JVM can use an 32 bit number to address memory locations. If >>> my server have about 64G ram. This seems a perfect. But what If I have a >>> server with 128G RAM and sufficient CPU's. Which configuration is better >>> a) two nodes on server each with ES_HEAP_SIZE say about 31G. b) one node >>> on the server with ES_HEAP_SIZE say 64G. >>> Thanks, >>> >>> -- >>> 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/03180561-2e7d-4e04-ab97-9d8b3a922f86%40googlegroups.com >>> <https://groups.google.com/d/msgid/elasticsearch/03180561-2e7d-4e04-ab97-9d8b3a922f86%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 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/CAGdPd5noOXMuVBZLoz9dJjxko5z4LmWBdk6aSTY2W2sUW7MbuA%40mail.gmail.com >> <https://groups.google.com/d/msgid/elasticsearch/CAGdPd5noOXMuVBZLoz9dJjxko5z4LmWBdk6aSTY2W2sUW7MbuA%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 a topic in the > Google Groups "elasticsearch" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/elasticsearch/qsWdzyqclMc/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/CALY%3DcQCF25cqzkhZ%2B2ooPfjFMyiSonWdKN%2BfPaiJvkEimK7Y0Q%40mail.gmail.com > <https://groups.google.com/d/msgid/elasticsearch/CALY%3DcQCF25cqzkhZ%2B2ooPfjFMyiSonWdKN%2BfPaiJvkEimK7Y0Q%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/CANBTPCFjoR9Y%3Dg_Aqwd4RsbgTnefrp_yNcf36kZp82nY6Am9JA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
