About replica shard use many field data


(Junheng Gong) #1

we have about 2.2B data in our elasticsearch, and we using facet and
function score query on those data.

it will load many data to fielddata, and replica double it.

so my question is "how to set replica to make sure it won't use field data
expect primary shard down"?

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(Mark Walkom) #2

Replica's don't double the amount of field data loaded. A query will only
load what it needs from the shards it needs, but it won't load primary and
replica, just one or the other.

Ideally you should 1) upgrade to aggs, facets are deprecated and not as
performant, and 2) upgrade to doc_values.

On 4 May 2015 at 18:50, Junheng Gong lunadancer@gmail.com wrote:

we have about 2.2B data in our elasticsearch, and we using facet and
function score query on those data.

it will load many data to fielddata, and replica double it.

so my question is "how to set replica to make sure it won't use field data
expect primary shard down"?

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(Junheng Gong) #3

Thanks for you replay Mark,

"active": {
"primaries": {
"fielddata": {
"memory_size_in_bytes": 77076457764,
"evictions": 0,
"fields": {
"commentsCount": {
"memory_size_in_bytes": 2416090508
},
"_uid": {
"memory_size_in_bytes": 46517210860
},
"sourceTimeUnit": {
"memory_size_in_bytes": 4160954108
},
"likesCount": {
"memory_size_in_bytes": 4225460468
},
"imageCount": {
"memory_size_in_bytes": 435807840
},
"geo": {
"memory_size_in_bytes": 19320933980
}
}
}
},
"total": {
"fielddata": {
"memory_size_in_bytes": 90893341516,
"evictions": 0,
"fields": {
"commentsCount": {
"memory_size_in_bytes": 2661775356
},
"_uid": {
"memory_size_in_bytes": 55220225456
},
"sourceTimeUnit": {
"memory_size_in_bytes": 4846336504
},
"likesCount": {
"memory_size_in_bytes": 4712145912
},
"imageCount": {
"memory_size_in_bytes": 517060176
},
"geo": {
"memory_size_in_bytes": 22935798112
}
}
}
}
},

we got field data usage by using GET /_stats/fielddata?fields=*

in this result total is more than primaries, so i thought maybe some
replica load data to field data too. (cause some query will send to replica
shard)

在 2015年5月4日星期一 UTC+8下午4:50:38,Junheng Gong写道:

we have about 2.2B data in our elasticsearch, and we using facet and
function score query on those data.

it will load many data to fielddata, and replica double it.

so my question is "how to set replica to make sure it won't use field data
expect primary shard down"?

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(system) #4