我的书签
添加书签
移除书签thread_stack
thread_stack
Per-thread stack size. Optional, default is 1M. Introduced in version 2.0.1-beta.
In the workers = threads mode, every request is processed
with a separate thread that needs its own stack space. By default, 1M per
thread are allocated for stack. However, extremely complex search requests
might eventually exhaust the default stack and require more. For instance,
a query that matches a thousands of keywords (either directly or through
term expansion) can eventually run out of stack. Previously, that resulted
in crashes. Starting with 2.0.1-beta, searchd attempts
to estimate the expected stack use, and blocks the potentially dangerous
queries. To process such queries, you can either the thread stack size
by using the thread_stack directive (or switch to a different
workers setting if that is possible).
A query with N levels of nesting is estimated to require approximately
30+0.16*N KB of stack, meaning that the default 64K is enough for queries
with upto 250 levels, 150K for upto 700 levels, etc. If the stack size limit
is not met, searchd fails the query and reports
the required stack size in the error message.
Example:
thread_stack = 256K
