Thanks all. I pushed changes last night, this should be fixed in 7.7.2, 8.1 and master.
Meanwhile, this is a trivial change to one line, so two ways to get by would be 1> just make the change yourself locally. Building Solr from scratch is actually not hard. The “ant package” target will get you the same thing you’d get from downloading the distribution. 2> use Java 9 or greater. Best, Erick > On Mar 25, 2019, at 1:58 AM, Lukas Weiss <lukas.we...@raiffeisen.it> wrote: > > I forward this message. Thanks Adam. > > Hi, > Apologies, I can’t figure out how to reply to the Solr mailing list. > I just ran across the same high CPU usage issue. I believe it’’s caused by > this commit which was introduced in Solr 7.7.0 > https://github.com/apache/lucene-solr/commit/eb652b84edf441d8369f5188cdd5e3ae2b151434#diff-e54b251d166135a1afb7938cfe152bb5 > There is a bug in JDK versions <=8 where using 0 threads in the > ScheduledThreadPool causes high CPU usage: > https://bugs.openjdk.java.net/browse/JDK-8129861 > Oddly, the latest version > of solr/core/src/java/org/apache/solr/update/CommitTracker.java on > master still uses 0 executors as the default. Presumably most everyone is > using JDK 9 or greater which has the bug fixed, so they don’t experience > the bug. > Feel free to relay this back to the mailing list. > Thanks, > Adam Guthrie > > > > > > Von: "Lukas Weiss" <lukas.we...@raiffeisen.it> > An: solr-user@lucene.apache.org, > Datum: 27.02.2019 11:13 > Betreff: High CPU usage with Solr 7.7.0 > > > > Hello, > > we recently updated our Solr server from 6.6.5 to 7.7.0. Since then, we > have problems with the server's CPU usage. > We have two Solr cores configured, but even if we clear all indexes and do > > not start the index process, we see 100 CPU usage for both cores. > > Here's what our top says: > > root@solr:~ # top > top - 09:25:24 up 17:40, 1 user, load average: 2,28, 2,56, 2,68 > Threads: 74 total, 3 running, 71 sleeping, 0 stopped, 0 zombie > %Cpu0 :100,0 us, 0,0 sy, 0,0 ni, 0,0 id, 0,0 wa, 0,0 hi, 0,0 si, > 0,0 st > %Cpu1 :100,0 us, 0,0 sy, 0,0 ni, 0,0 id, 0,0 wa, 0,0 hi, 0,0 si, > 0,0 st > %Cpu2 : 11,3 us, 1,0 sy, 0,0 ni, 86,7 id, 0,7 wa, 0,0 hi, 0,3 si, > 0,0 st > %Cpu3 : 3,0 us, 3,0 sy, 0,0 ni, 93,7 id, 0,3 wa, 0,0 hi, 0,0 si, > 0,0 st > KiB Mem : 8388608 total, 7859168 free, 496744 used, 32696 > buff/cache > KiB Swap: 2097152 total, 2097152 free, 0 used. 7859168 avail Mem > > > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > > P > 10209 solr 20 0 6138468 452520 25740 R 99,9 5,4 29:43.45 java > -server -Xms1024m -Xmx1024m -XX:NewRatio=3 -XX:SurvivorRatio=4 > -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=8 > -XX:+UseConcMarkSweepGC -XX:ConcGCThreads=4 + 24 > 10214 solr 20 0 6138468 452520 25740 R 99,9 5,4 28:42.91 java > -server -Xms1024m -Xmx1024m -XX:NewRatio=3 -XX:SurvivorRatio=4 > -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=8 > -XX:+UseConcMarkSweepGC -XX:ConcGCThreads=4 + 25 > > The solr server is installed on a Debian Stretch 9.8 (64bit) on Linux LXC > dedicated Container. > > Some more server info: > > root@solr:~ # java -version > openjdk version "1.8.0_181" > OpenJDK Runtime Environment (build 1.8.0_181-8u181-b13-2~deb9u1-b13) > OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode) > > root@solr:~ # free -m > total used free shared buff/cache > available > Mem: 8192 484 7675 701 31 7675 > Swap: 2048 0 2048 > > We also found something strange if we do an strace of the main process, we > > get lots of ongoing connection timeouts: > > root@solr:~ # strace -F -p 4136 > strace: Process 4136 attached with 48 threads > strace: [ Process PID=11089 runs in x32 mode. ] > [pid 4937] epoll_wait(139, <unfinished ...> > [pid 4936] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4909] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4618] epoll_wait(136, <unfinished ...> > [pid 4576] futex(0x7ff61ce66474, FUTEX_WAIT_PRIVATE, 1, NULL <unfinished > ...> > [pid 4279] futex(0x7ff61ce62b34, FUTEX_WAIT_PRIVATE, 2203, NULL > <unfinished ...> > [pid 4244] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4227] futex(0x7ff56c71ae14, FUTEX_WAIT_PRIVATE, 2237, NULL > <unfinished ...> > [pid 4243] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4228] futex(0x7ff5608331a4, FUTEX_WAIT_PRIVATE, 2237, NULL > <unfinished ...> > [pid 4208] futex(0x7ff61ce63e54, FUTEX_WAIT_PRIVATE, 5, NULL <unfinished > ...> > [pid 4205] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4204] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4196] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4195] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4194] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4193] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4187] restart_syscall(<... resuming interrupted restart_syscall ...> > > <unfinished ...> > [pid 4180] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4179] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4177] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4174] accept(133, <unfinished ...> > [pid 4173] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4172] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4171] restart_syscall(<... resuming interrupted restart_syscall ...> > > <unfinished ...> > [pid 4165] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4164] futex(0x7ff61c1f5054, FUTEX_WAIT_PRIVATE, 3, NULL <unfinished > ...> > [pid 4163] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4162] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4161] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4160] futex(0x7ff623d52c20, > FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, 0xffffffff > <unfinished ...> > [pid 4159] futex(0x7ff61c1e9d54, FUTEX_WAIT_PRIVATE, 7, NULL <unfinished > ...> > [pid 4158] futex(0x7ff61c1b7f54, FUTEX_WAIT_PRIVATE, 15, NULL <unfinished > > ...> > [pid 4157] futex(0x7ff61c1b5554, FUTEX_WAIT_PRIVATE, 19, NULL <unfinished > > ...> > [pid 4156] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4155] restart_syscall(<... resuming interrupted futex ...> > <unfinished ...> > [pid 4153] futex(0x7ff61c06c754, FUTEX_WAIT_PRIVATE, 7, NULL <unfinished > ...> > [pid 4152] futex(0x7ff61c06ab54, FUTEX_WAIT_PRIVATE, 3, NULL <unfinished > ...> > [pid 4151] futex(0x7ff61c068f54, FUTEX_WAIT_PRIVATE, 7, NULL <unfinished > ...> > [pid 4150] futex(0x7ff61c067354, FUTEX_WAIT_PRIVATE, 7, NULL <unfinished > ...> > [pid 4148] futex(0x7ff61c024a54, FUTEX_WAIT_PRIVATE, 403, NULL > <unfinished ...> > [pid 4165] <... restart_syscall resumed> ) = -1 ETIMEDOUT (Connection > timed out) > [pid 4165] futex(0x7ff61c1f7a28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4165] futex(0x7ff61c1f7a54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564856, tv_nsec=849859736}, 0xffffffff <unfinished ...> > [pid 4147] futex(0x7ff61c022e54, FUTEX_WAIT_PRIVATE, 415, NULL > <unfinished ...> > [pid 4146] futex(0x7ff61c021254, FUTEX_WAIT_PRIVATE, 397, NULL > <unfinished ...> > [pid 4145] futex(0x7ff61c01f654, FUTEX_WAIT_PRIVATE, 405, NULL > <unfinished ...> > [pid 4144] futex(0x7ff61c00e354, FUTEX_WAIT_PRIVATE, 1, NULL <unfinished > ...> > [pid 4136] futex(0x7ff624b729d0, FUTEX_WAIT, 4144, NULL <unfinished ...> > [pid 4165] <... futex resumed> ) = -1 ETIMEDOUT (Connection timed > out) > [pid 4165] futex(0x7ff61c1f7a28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4165] futex(0x7ff61c1f7a54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564856, tv_nsec=900162344}, 0xffffffff) = -1 ETIMEDOUT > (Connection timed out) > [pid 4165] futex(0x7ff61c1f7a28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4165] futex(0x7ff61c1f7a54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564856, tv_nsec=950365105}, 0xffffffff) = -1 ETIMEDOUT > (Connection timed out) > [pid 4165] futex(0x7ff61c1f7a28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4165] futex(0x7ff61c1f7a54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564857, tv_nsec=586325}, 0xffffffff) = -1 ETIMEDOUT (Connection > timed out) > [pid 4165] futex(0x7ff61c1f7a28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4165] futex(0x7ff61c1f7a54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564857, tv_nsec=50791977}, 0xffffffff) = -1 ETIMEDOUT > (Connection timed out) > [pid 4165] futex(0x7ff61c1f7a28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4165] futex(0x7ff61c1f7a54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564857, tv_nsec=100997890}, 0xffffffff) = -1 ETIMEDOUT > (Connection timed out) > [pid 4165] futex(0x7ff61c1f7a28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4165] futex(0x7ff61c1f7a54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564857, tv_nsec=151206817}, 0xffffffff) = -1 ETIMEDOUT > (Connection timed out) > [pid 4165] futex(0x7ff61c1f7a28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4165] futex(0x7ff61c1f7a54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564857, tv_nsec=201402531}, 0xffffffff) = -1 ETIMEDOUT > (Connection timed out) > [pid 4165] futex(0x7ff61c1f7a28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4165] futex(0x7ff61c1f7a54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564857, tv_nsec=251616284}, 0xffffffff) = -1 ETIMEDOUT > (Connection timed out) > [pid 4165] futex(0x7ff61c1f7a28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4165] futex(0x7ff61c1f7a54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564857, tv_nsec=301813556}, 0xffffffff) = -1 ETIMEDOUT > (Connection timed out) > [pid 4165] futex(0x7ff61c1f7a28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4165] futex(0x7ff61c1f7a54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564857, tv_nsec=352036802}, 0xffffffff) = -1 ETIMEDOUT > (Connection timed out) > [pid 4165] futex(0x7ff61c1f7a28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4165] futex(0x7ff61c1f7a54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564857, tv_nsec=402239182}, 0xffffffff) = -1 ETIMEDOUT > (Connection timed out) > [pid 4165] futex(0x7ff61c1f7a28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4165] futex(0x7ff61c1f7a54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564857, tv_nsec=452439835}, 0xffffffff) = -1 ETIMEDOUT > (Connection timed out) > [pid 4165] futex(0x7ff61c1f7a28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4165] futex(0x7ff61c1f7a54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564857, tv_nsec=502635489}, 0xffffffff) = -1 ETIMEDOUT > (Connection timed out) > [pid 4165] futex(0x7ff61c1f7a28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4165] futex(0x7ff61c1f7a54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564857, tv_nsec=552844020}, 0xffffffff <unfinished ...> > [pid 4156] <... restart_syscall resumed> ) = -1 ETIMEDOUT (Connection > timed out) > [pid 4156] futex(0x7ff61c1aba28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4156] futex(0x7ff61c1aba54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564858, tv_nsec=506449064}, 0xffffffff <unfinished ...> > [pid 4165] <... futex resumed> ) = -1 ETIMEDOUT (Connection timed > out) > [pid 4165] futex(0x7ff61c1f7a28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4165] futex(0x7ff61c1f7a54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564857, tv_nsec=603013734}, 0xffffffff) = -1 ETIMEDOUT > (Connection timed out) > [pid 4165] futex(0x7ff61c1f7a28, FUTEX_WAKE_PRIVATE, 1) = 0 > [pid 4165] futex(0x7ff61c1f7a54, FUTEX_WAIT_BITSET_PRIVATE, 1, > {tv_sec=32564857, tv_nsec=653149664}, 0xffffffff^Cstrace: Process 4136 > detached > strace: Process 4144 detached > strace: Process 4145 detached > strace: Process 4146 detached > strace: Process 4147 detached > strace: Process 4148 detached > strace: Process 4150 detached > strace: Process 4151 detached > strace: Process 4152 detached > strace: Process 4153 detached > .... > > > Could you help us to determine what's wrong with our setup? > > Thank you very much, > > Kind regards > Lukas Weiss >
