Is it safe to clear pagecache

Hi., to All.
Good Evening.

Generally elasticsearch occupies a lot of pagecache, does it safe to use the command
'echo 3 > /proc/sys/vm/drop_caches'
to clear pagecache? even when data is indexing?

Thanks to you all.

regards

This is intended. Elasticsearch performance relies a lot on OS level filesystem cache for indexing but mostly for querying. If that cache is not available then performance will certainly degrade.

ok

then
when the memory usage is high ,for example higher than 99%,
is it necessary (or safe?) to clear filesystem cache use the command above?

thanks

You should leave as is, do not clear filesystem pagecache. It's cache, so if something else critical to OS health needs memory, OS will release the cache anyway.

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