Hi. > hello. > > do you maybe have already feedback? > was it successfull? (disabled io-cache, disabled stat-prefetch, inreades io-thread count to 64) > For now it seems that the work-arround has worked. We have not encountered any hung processes on the server since the change (io-cache disable, stat-prefetch disable io-thread-count=64). The only "bad" influence is expectable, the pages (mainly list of several hundred images per page) take a little while longer. Of course this is caused by the files not being cached. > is/was your problem similar to this one? > http://bugs.gluster.com/show_bug.cgi?id=3011 The symptoms were the same. The processes were hung on ioctl. /proc//wchan for the PIDs showed "sync_page". I'll experiment a bit once again today and set the volume back to original parameters and wait for a hung process to get you the information (/tmp/glusterdump.pid). I'll report back later. Jiri > > Am 13.06.2011 19:14, schrieb Jiri Lunacek: >> Thanks for the tip. I disabled io-cache and stat-prefetch, increased io-thread-count to 64 and >> rebooted the server to clean off the hung apache processes. We'll see tomorrow. >> >> On 13.6.2011, at 15:58, Justice London wrote: >> >>> Disable io-cache and up the threads to 64 and your problems should disappear. They did for me when >>> I made both of these changes. >>> Justice London >>> *From:*gluster-users-bounces at gluster.org >>> <mailto:gluster-users-bounces at gluster.org>[mailto:gluster-users-bounces at gluster.org]*On Behalf >>> Of*Jiri Lunacek >>> *Sent:*Monday, June 13, 2011 1:49 AM >>> *To:*gluster-users at gluster.org <mailto:gluster-users at gluster.org> >>> *Subject:*Apache hung tasks still occur with glusterfs 3.2.1 >>> Hi all. >>> We have been having problems with hung tasks of apache reading from glusterfs 2-replica volume >>> ever since upgrading to 3.2.0. The problems were identical to those described here: >>> http://gluster.org/pipermail/gluster-users/2011-May/007697.html >>> Yesterday we updated to 3.2.1. >>> A good thing is that the hung tasks stopped appearing when gluster is in "intact" operation, i.e. >>> when there are no modifications to the gluster configs at all. >>> Today we modified some other volume exported by the same cluster (but not sharing anything with >>> the volume used by the apache process). And, once again, two requests of apache reading from >>> glusterfs volume are stuck. >>> Any help with this issue would be very appreciated as right now we have to nightly-reboot the >>> machine as the processes re stuck in iowait -> unkillable. >>> I really do not want to go through the downgrade to 3.1.4 since it seems from the mailing list >>> that it may not go exactly smooth. We are exporting millions of files and any large operation on >>> the exported filesystem takes days. >>> I am attaching tech info on the problem. >>> client: >>> Centos 5.6 >>> 2.6.18-238.9.1.el5 >>> fuse-2.7.4-8.el5 >>> glusterfs-fuse-3.2.1-1 >>> glusterfs-core-3.2.1-1 >>> servers: >>> Centos 5.6 >>> 2.6.18-194.32.1.el5 >>> fuse-2.7.4-8.el5 >>> glusterfs-fuse-3.2.1-1 >>> glusterfs-core-3.2.1-1 >>> dmesg: >>> INFO: task httpd:1246 blocked for more than 120 seconds. >>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >>> httpd D ffff81000101d7a0 0 1246 2394 1247 1191 (NOTLB) >>> ffff81013ee7dc38 0000000000000082 0000000000000092 ffff81013ee7dcd8 >>> ffff81013ee7dd04 000000000000000a ffff810144d0f7e0 ffff81019fc28100 >>> 0000308f8b444727 00000000000014ee ffff810144d0f9c8 000000038006e608 >>> Call Trace: >>> [<ffffffff8006ec4e>] do_gettimeofday+0x40/0x90 >>> [<ffffffff80028c5a>] sync_page+0x0/0x43 >>> [<ffffffff800637ca>] io_schedule+0x3f/0x67 >>> [<ffffffff80028c98>] sync_page+0x3e/0x43 >>> [<ffffffff8006390e>] __wait_on_bit_lock+0x36/0x66 >>> [<ffffffff8003ff27>] __lock_page+0x5e/0x64 >>> [<ffffffff800a2921>] wake_bit_function+0x0/0x23 >>> [<ffffffff8003fd85>] pagevec_lookup+0x17/0x1e >>> [<ffffffff800cc666>] invalidate_inode_pages2_range+0x73/0x1bd >>> [<ffffffff8004fc94>] finish_wait+0x32/0x5d >>> [<ffffffff884b9798>] :fuse:wait_answer_interruptible+0xb6/0xbd >>> [<ffffffff800a28f3>] autoremove_wake_function+0x0/0x2e >>> [<ffffffff8009a485>] recalc_sigpending+0xe/0x25 >>> [<ffffffff8001decc>] sigprocmask+0xb7/0xdb >>> [<ffffffff884bd456>] :fuse:fuse_finish_open+0x36/0x62 >>> [<ffffffff884bda11>] :fuse:fuse_open_common+0x147/0x158 >>> [<ffffffff884bda22>] :fuse:fuse_open+0x0/0x7 >>> [<ffffffff8001eb99>] __dentry_open+0xd9/0x1dc >>> [<ffffffff8002766e>] do_filp_open+0x2a/0x38 >>> [<ffffffff8001a061>] do_sys_open+0x44/0xbe >>> [<ffffffff8005d28d>] tracesys+0xd5/0xe0 >>> INFO: task httpd:1837 blocked for more than 120 seconds. >>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >>> httpd D ffff810001004420 0 1837 2394 1856 1289 (NOTLB) >>> ffff81013c6f9c38 0000000000000086 ffff81013c6f9bf8 00000000fffffffe >>> ffff810170ce7000 000000000000000a ffff81019c0ae7a0 ffffffff80311b60 >>> 0000308c0f83d792 0000000000000ec4 ffff81019c0ae988 000000008006e608 >>> Call Trace: >>> [<ffffffff8006ec4e>] do_gettimeofday+0x40/0x90 >>> [<ffffffff80028c5a>] sync_page+0x0/0x43 >>> [<ffffffff800637ca>] io_schedule+0x3f/0x67 >>> [<ffffffff80028c98>] sync_page+0x3e/0x43 >>> [<ffffffff8006390e>] __wait_on_bit_lock+0x36/0x66 >>> [<ffffffff8003ff27>] __lock_page+0x5e/0x64 >>> [<ffffffff800a2921>] wake_bit_function+0x0/0x23 >>> [<ffffffff8003fd85>] pagevec_lookup+0x17/0x1e >>> [<ffffffff800cc666>] invalidate_inode_pages2_range+0x73/0x1bd >>> [<ffffffff8004fc94>] finish_wait+0x32/0x5d >>> [<ffffffff884b9798>] :fuse:wait_answer_interruptible+0xb6/0xbd >>> [<ffffffff800a28f3>] autoremove_wake_function+0x0/0x2e >>> [<ffffffff8009a485>] recalc_sigpending+0xe/0x25 >>> [<ffffffff8001decc>] sigprocmask+0xb7/0xdb >>> [<ffffffff884bd456>] :fuse:fuse_finish_open+0x36/0x62 >>> [<ffffffff884bda11>] :fuse:fuse_open_common+0x147/0x158 >>> [<ffffffff884bda22>] :fuse:fuse_open+0x0/0x7 >>> [<ffffffff8001eb99>] __dentry_open+0xd9/0x1dc >>> [<ffffffff8002766e>] do_filp_open+0x2a/0x38 >>> [<ffffffff8001a061>] do_sys_open+0x44/0xbe >>> [<ffffffff8005d28d>] tracesys+0xd5/0xe0 >>> INFO: task httpd:383 blocked for more than 120 seconds. >>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >>> httpd D ffff81019fa21100 0 383 2394 534 (NOTLB) >>> ffff81013e497c08 0000000000000082 ffff810183eb8910 ffffffff884b9219 >>> ffff81019e41c600 0000000000000009 ffff81019b1e2100 ffff81019fa21100 >>> 0000308c0e2c2bfb 0000000000016477 ffff81019b1e22e8 000000038006e608 >>> Call Trace: >>> [<ffffffff884b9219>] :fuse:flush_bg_queue+0x2b/0x48 >>> [<ffffffff8006ec4e>] do_gettimeofday+0x40/0x90 >>> [<ffffffff8005a9f9>] getnstimeofday+0x10/0x28 >>> [<ffffffff80028c5a>] sync_page+0x0/0x43 >>> [<ffffffff800637ca>] io_schedule+0x3f/0x67 >>> [<ffffffff80028c98>] sync_page+0x3e/0x43 >>> [<ffffffff8006390e>] __wait_on_bit_lock+0x36/0x66 >>> [<ffffffff8003ff27>] __lock_page+0x5e/0x64 >>> [<ffffffff800a2921>] wake_bit_function+0x0/0x23 >>> [<ffffffff8000c48d>] do_generic_mapping_read+0x1df/0x359 >>> [<ffffffff8000d279>] file_read_actor+0x0/0x159 >>> [<ffffffff8000c753>] __generic_file_aio_read+0x14c/0x198 >>> [<ffffffff800c8c45>] generic_file_read+0xac/0xc5 >>> [<ffffffff800a28f3>] autoremove_wake_function+0x0/0x2e >>> [<ffffffff80130778>] selinux_file_permission+0x9f/0xb4 >>> [<ffffffff8000b78d>] vfs_read+0xcb/0x171 >>> [<ffffffff80011d34>] sys_read+0x45/0x6e >>> [<ffffffff8005d28d>] tracesys+0xd5/0xe0 >>> possibly relevant log messages: >>> [2011-06-13 09:09:14.985576] W [socket.c:1494:__socket_proto_state_machine] 0-glusterfs: reading >>> from socket failed. Error (Transport endpoint is not connected), peer (81.0.225.122:24007) >>> [2011-06-13 09:09:25.741055] I [glusterfsd-mgmt.c:637:mgmt_getspec_cbk] 0-: No change in volfile, >>> continuing >>> [2011-06-13 09:59:00.644130] I [afr-common.c:639:afr_lookup_self_heal_check] 0-isifa1-replicate-0: >>> size differs for /data/foto/thumbs/3140/31409780.jpg >>> [2011-06-13 09:59:00.644269] I [afr-common.c:801:afr_lookup_done] 0-isifa1-replicate-0: background >>> meta-data data self-heal triggered. path: /data/foto/thumbs/3140/31409780.jpg >>> [2011-06-13 09:59:00.822524] W [dict.c:437:dict_ref] >>> (-->/opt/glusterfs/3.2.1/lib64/glusterfs/3.2.1/xlator/protocol/client.so(client3_1_fstat_cbk+0x2cb) [0x2aaaab1afa0b] >>> (-->/opt/glusterfs/3.2.1/lib64/glusterfs/3.2.1/xlator/cluster/replicate.so(afr_sh_data_fstat_cbk+0x17d) >>> [0x2aaaab3e4c9d] >>> (-->/opt/glusterfs/3.2.1/lib64/glusterfs/3.2.1/xlator/cluster/replicate.so(afr_sh_data_fix+0x1fc) >>> [0x2aaaab3e493c]))) 0-dict: dict is NULL >>> [2011-06-13 09:59:00.824323] I [afr-common.c:639:afr_lookup_self_heal_check] 0-isifa1-replicate-0: >>> size differs for /data/foto/thumbs/3140/31409781.jpg >>> [2011-06-13 09:59:00.824356] I [afr-common.c:801:afr_lookup_done] 0-isifa1-replicate-0: background >>> meta-data data self-heal triggered. path: /data/foto/thumbs/3140/31409781.jpg >>> [2011-06-13 09:59:00.826494] I [afr-self-heal-common.c:1557:afr_self_heal_completion_cbk] >>> 0-isifa1-replicate-0: background meta-data data self-heal completed on >>> /data/foto/thumbs/3140/31409780.jpg >>> [2011-06-13 09:59:00.830902] W [dict.c:437:dict_ref] >>> (-->/opt/glusterfs/3.2.1/lib64/glusterfs/3.2.1/xlator/protocol/client.so(client3_1_fstat_cbk+0x2cb) [0x2aaaab1afa0b] >>> (-->/opt/glusterfs/3.2.1/lib64/glusterfs/3.2.1/xlator/cluster/replicate.so(afr_sh_data_fstat_cbk+0x17d) >>> [0x2aaaab3e4c9d] >>> (-->/opt/glusterfs/3.2.1/lib64/glusterfs/3.2.1/xlator/cluster/replicate.so(afr_sh_data_fix+0x1fc) >>> [0x2aaaab3e493c]))) 0-dict: dict is NULL >>> gluster-server volume config: >>> volume isifa1-posix >>> type storage/posix >>> option directory /mnt/data/isifa1 >>> end-volume >>> volume isifa1-access-control >>> type features/access-control >>> subvolumes isifa1-posix >>> end-volume >>> volume isifa1-locks >>> type features/locks >>> subvolumes isifa1-access-control >>> end-volume >>> volume isifa1-io-threads >>> type performance/io-threads >>> subvolumes isifa1-locks >>> end-volume >>> volume isifa1-marker >>> type features/marker >>> option volume-uuid 39d5c509-ad39-4b24-a272-c33e212cf912 >>> option timestamp-file /etc/glusterd/vols/isifa1/marker.tstamp >>> option xtime off >>> option quota off >>> subvolumes isifa1-io-threads >>> end-volume >>> volume /mnt/data/isifa1 >>> type debug/io-stats >>> option latency-measurement off >>> option count-fop-hits off >>> subvolumes isifa1-marker >>> end-volume >>> volume isifa1-server >>> type protocol/server >>> option transport-type tcp >>> option auth.addr./mnt/data/isifa1.allow >>> 81.0.225.120,81.0.225.121,81.0.225.90,81.0.225.117,81.0.225.118,82.208.17.113 >>> subvolumes /mnt/data/isifa1 >>> end-volume >>> gluster-fuse config: >>> volume isifa1-client-0 >>> type protocol/client >>> option remote-host isifa-data1 >>> option remote-subvolume /mnt/data/isifa1 >>> option transport-type tcp >>> end-volume >>> volume isifa1-client-1 >>> type protocol/client >>> option remote-host isifa-data2 >>> option remote-subvolume /mnt/data/isifa1 >>> option transport-type tcp >>> end-volume >>> volume isifa1-replicate-0 >>> type cluster/replicate >>> subvolumes isifa1-client-0 isifa1-client-1 >>> end-volume >>> volume isifa1-write-behind >>> type performance/write-behind >>> subvolumes isifa1-replicate-0 >>> end-volume >>> volume isifa1-read-ahead >>> type performance/read-ahead >>> subvolumes isifa1-write-behind >>> end-volume >>> volume isifa1-io-cache >>> type performance/io-cache >>> subvolumes isifa1-read-ahead >>> end-volume >>> volume isifa1-quick-read >>> type performance/quick-read >>> subvolumes isifa1-io-cache >>> end-volume >>> volume isifa1-stat-prefetch >>> type performance/stat-prefetch >>> subvolumes isifa1-quick-read >>> end-volume >>> volume isifa1 >>> type debug/io-stats >>> option latency-measurement off >>> option count-fop-hits off >>> subvolumes isifa1-stat-prefetch >>> end-volume >> >> >> >> _______________________________________________ >> Gluster-users mailing list >> Gluster-users at gluster.org >> http://gluster.org/cgi-bin/mailman/listinfo/gluster-users > > -- > > Mag. 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