1 Large omap objects ceph health deatil

admin · 发表于 2022-8-19 17:00:37

Large omap objects
# ceph health detail
HEALTH_WARN 1 large omap objects
LARGE_OMAP_OBJECTS 1 large omap objects
1 large objects found in pool 'is_recovery' #出现large omap的pool
Search the cluster log for 'Large omap object found' for more details.

ceph pg ls-by-pool is_recovery|awk '{print "ceph pg "$1 " query|grep num_large_omap_objects"}'|sh -x
ceph pg 11.0 query|grep num_large_omap_objects
ceph pg 11.1 query|grep num_large_omap_objects
ceph pg 11.2 query|grep num_large_omap_objects

[root@ceph-1 ~]# ceph daemon mds.ceph-1 flush journal
{
"message": "",
"return_code": 0
}
[root@ceph-1 ~]#
[root@ceph-2 ~]# ceph daemon mds.ceph-2 flush journal
"mds_not_active"
[root@ceph-2 ~]# ceph daemon mds.ceph-2 flush journal
"mds_not_active"

admin · 发表于 2022-8-23 09:53:54

index pool的 large omap 处理
向单个bucket压测2000W个object，默认设置shard数为16，压测到1800W出现large omap,介绍一下错误定位和如何处理。

异常定位
集群状态如下

[root@demo123 cephuser]# ceph health detail
HEALTH_WARN 16 large omap objects
LARGE_OMAP_OBJECTS 16 large omap objects
16 large objects found in pool 'cn-bj-test2.rgw.buckets.index'
Search the cluster log for 'Large omap object found' for more details.
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通过脚本找到对应的pg信息，脚本请查看之前一篇omap large处理的文章。

[root@demo123 cephuser]# python large_omap.py
Large omap objects poolname = cn-bj-test2.rgw.buckets.index
pgid=13.1f OSDs=[78, 9, 59] num_large_omap_objects=1
pgid=13.33 OSDs=[59, 79, 19] num_large_omap_objects=1
pgid=13.3c OSDs=[49, 29, 78] num_large_omap_objects=1
pgid=13.3d OSDs=[48, 69, 9] num_large_omap_objects=1
pgid=13.45 OSDs=[88, 39, 28] num_large_omap_objects=1
pgid=13.4d OSDs=[38, 29, 89] num_large_omap_objects=1
pgid=13.50 OSDs=[68, 19, 59] num_large_omap_objects=1
pgid=13.6b OSDs=[39, 79, 8] num_large_omap_objects=1
pgid=13.8e OSDs=[38, 9, 78] num_large_omap_objects=1
pgid=13.d1 OSDs=[9, 88, 38] num_large_omap_objects=1
pgid=13.d2 OSDs=[59, 88, 28] num_large_omap_objects=1
pgid=13.e1 OSDs=[19, 88, 49] num_large_omap_objects=1
pgid=13.e4 OSDs=[38, 19, 89] num_large_omap_objects=1
pgid=13.e7 OSDs=[19, 89, 38] num_large_omap_objects=1
pgid=13.ec OSDs=[89, 28, 48] num_large_omap_objects=1
pgid=13.f5 OSDs=[38, 88, 19] num_large_omap_objects=1
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查找OSD日志，确定object名称(".dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.11")，发现omap条目数达到了2378492，超过默认告警值

[root@demo123 cephuser]# zcat /var/log/ceph/ceph-osd.19.log-20181231.gz |grep "omap"
2018-12-30 23:00:42.334766 7f6583f44700  0 log_channel(cluster) log [WRN] : Large omap object found. Object: 13:87443b2d:::.dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.11:head Key count: 2378492 Size (bytes): 491722758
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默认告警值为2000000，2378492>2000000，不建议去修改这个默认值，因为改得过大会加大集群出现异常的风险，属于掩耳盗铃。

[root@demo123 cephuser]# ceph daemon /var/run/ceph/ceph-osd.19.asok config show |grep large
"osd_bench_large_size_max_throughput": "104857600",
"osd_deep_scrub_large_omap_object_key_threshold": "2000000",
"osd_deep_scrub_large_omap_object_value_sum_threshold": "1073741824",
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查看一下发生omap过大的bucket，确定相关信息

[root@demo123 cephuser]# radosgw-admin bucket stats --bucket=demo1
{
"bucket": "demo1",
"zonegroup": "68f1dcf5-0470-4a48-8cd2-51c837a2cafb",
"placement_rule": "default-placement",
"explicit_placement": {
      "data_pool": "",
      "data_extra_pool": "",
      "index_pool": ""
},
"id": "afd874cd-f976-4007-a77c-be6fca298b71.34209.1", #当前bucket instance ID，
"marker": "afd874cd-f976-4007-a77c-be6fca298b71.34209.1",
"index_type": "Normal",
"owner": "s3test",
"ver": "0#2638037,1#2637965,2#2632835,3#2632869,4#2632799,5#2632597,6#2633289,7#2633175,8#2637227,9#2637609,10#2637997,11#2632455,12#2631337,13#2631624,14#2631983,15#2632359",
"master_ver": "0#0,1#0,2#0,3#0,4#0,5#0,6#0,7#0,8#0,9#0,10#0,11#0,12#0,13#0,14#0,15#0", #16个shard
"mtime": "2018-11-28 16:47:45.560039",
"max_marker": "0#00002638036.2638608.5,1#00002637964.2638536.5,2#00002632834.2649479.5,3#00002632868.2633634.5,4#00002632798.2633370.5,5#00002632596.2633168.5,6#00002633288.2633860.5,7#00002633174.2633747.5,8#00002637226.2637798.5,9#00002637608.2638181.5,10#00002637996.2638569.5,11#00002632454.2633026.5,12#00002631336.2631914.5,13#00002631623.2632195.5,14#00002631982.2632554.5,15#00002632358.2632930.5",
"usage": {
      "rgw.main": {
         "size": 1975757355553,
         "size_actual": 2047893610496,
         "size_utilized": 1975757355553,
         "size_kb": 1929450543,
         "size_kb_actual": 1999896104,
         "size_kb_utilized": 1929450543,
         "num_objects": 19998962 #近2000Wobject
      }
},
"bucket_quota": {
      "enabled": false,
      "check_on_raw": false,
      "max_size": -1,
      "max_size_kb": 0,
      "max_objects": -1
}
}
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异常处理
通过bucket reshard操作，将原来的bucket 重新划分shard，shard数量从16->64。注意reshard有风险，最好停掉客户端的读写操作以后再进行，同时如果你使用了multisite，请根据官方说明立即关闭Dynamic resharding特性。

Dynamic resharding 说明: http://docs.ceph.com/docs/mimic/radosgw/dynamicresharding/

做完reshard需要手工删除之前的索引数据，工具也提示了下面的内容。

[root@demo123 cephuser]# radosgw-admin bucket reshard --bucket demo1 --num-shards 64
*** NOTICE: operation will not remove old bucket index objects ***
***       these will need to be removed manually          ***
tenant:
bucket name: demo1
old bucket instance id: afd874cd-f976-4007-a77c-be6fca298b71.34209.1
new bucket instance id: afd874cd-f976-4007-a77c-be6fca298b71.45786.1
total entries: 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 19998962
2019-01-03 11:42:33.741314 7f74d15c6dc0  0 WARNING: RGWReshard::add failed to drop lock on demo1:afd874cd-f976-4007-a77c-be6fca298b71.34209.1 ret=-2
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检查reshard结果

[root@demo123 cephuser]# radosgw-admin bucket stats --bucket=demo1
{
"bucket": "demo1",
"zonegroup": "68f1dcf5-0470-4a48-8cd2-51c837a2cafb",
"placement_rule": "default-placement",
"explicit_placement": {
      "data_pool": "",
      "data_extra_pool": "",
      "index_pool": ""
},
"id": "afd874cd-f976-4007-a77c-be6fca298b71.45786.1", #bucket instance ID发生变化
"marker": "afd874cd-f976-4007-a77c-be6fca298b71.34209.1",
"index_type": "Normal",
"owner": "s3test",
"ver": "0#4920,1#4920,2#4883,3#4877,4#4882,5#4883,6#4885,7#4880,8#4882,9#4880,10#4878,11#4883,12#4923,13#4883,14#4882,15#4874,16#4878,17#4880,18#4884,19#4881,20#4882,21#4881,22#4876,23#4922,24#4883,25#4887,26#4881,27#4879,28#4879,29#4879,30#4882,31#4884,32#4880,33#4879,34#4917,35#4876,36#4883,37#4885,38#4884,39#4879,40#4883,41#4880,42#4880,43#4882,44#4884,45#4877,46#4879,47#4877,48#4881,49#4880,50#4881,51#4881,52#4883,53#4876,54#4880,55#4884,56#4881,57#4885,58#4882,59#4881,60#4881,61#4881,62#4883,63#4882",#shard 数量变为了64
"master_ver": "0#0,1#0,2#0,3#0,4#0,5#0,6#0,7#0,8#0,9#0,10#0,11#0,12#0,13#0,14#0,15#0,16#0,17#0,18#0,19#0,20#0,21#0,22#0,23#0,24#0,25#0,26#0,27#0,28#0,29#0,30#0,31#0,32#0,33#0,34#0,35#0,36#0,37#0,38#0,39#0,40#0,41#0,42#0,43#0,44#0,45#0,46#0,47#0,48#0,49#0,50#0,51#0,52#0,53#0,54#0,55#0,56#0,57#0,58#0,59#0,60#0,61#0,62#0,63#0",
"mtime": "2019-01-03 11:32:50.349905",
"max_marker": "0#,1#,2#,3#,4#,5#,6#,7#,8#,9#,10#,11#,12#,13#,14#,15#,16#,17#,18#,19#,20#,21#,22#,23#,24#,25#,26#,27#,28#,29#,30#,31#,32#,33#,34#,35#,36#,37#,38#,39#,40#,41#,42#,43#,44#,45#,46#,47#,48#,49#,50#,51#,52#,53#,54#,55#,56#,57#,58#,59#,60#,61#,62#,63#",
"usage": {
      "rgw.main": {
         "size": 1975757355553,
         "size_actual": 2047893610496,
         "size_utilized": 1975757355553,
         "size_kb": 1929450543,
         "size_kb_actual": 1999896104,
         "size_kb_utilized": 1929450543,
         "num_objects": 19998962
      }
},
"bucket_quota": {
      "enabled": false,
      "check_on_raw": false,
      "max_size": -1,
      "max_size_kb": 0,
      "max_objects": -1
}
}
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回收旧数据
根据之前工具的提示需要回收index和meta两个pool里面的残留数据

回收index pool数据

[root@demo123 cephuser]# rados ls -p cn-bj-test2.rgw.buckets.index|grep "afd874cd-f976-4007-a77c-be6fca298b71.34209.1"
.dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.5
.dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.15
.dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.2
.dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.1
.dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.0
.dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.4
.dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.11
.dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.13
.dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.6
.dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.3
.dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.7
.dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.9
.dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.14
.dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.10
.dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.12
.dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.8
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使用rados rm命令删除数据

[root@demo123 supdev]# rados ls -p cn-bj-test2.rgw.buckets.index|grep "afd874cd-f976-4007-a77c-be6fca298b71.34209.1"|awk '{print "rados rm -p cn-bj-test2.rgw.buckets.index "$1}'|sh -x
+ rados rm -p cn-bj-test2.rgw.buckets.index .dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.5
+ rados rm -p cn-bj-test2.rgw.buckets.index .dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.15
+ rados rm -p cn-bj-test2.rgw.buckets.index .dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.2
+ rados rm -p cn-bj-test2.rgw.buckets.index .dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.1
+ rados rm -p cn-bj-test2.rgw.buckets.index .dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.0
+ rados rm -p cn-bj-test2.rgw.buckets.index .dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.4
+ rados rm -p cn-bj-test2.rgw.buckets.index .dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.11
+ rados rm -p cn-bj-test2.rgw.buckets.index .dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.13
+ rados rm -p cn-bj-test2.rgw.buckets.index .dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.6
+ rados rm -p cn-bj-test2.rgw.buckets.index .dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.3
+ rados rm -p cn-bj-test2.rgw.buckets.index .dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.7
+ rados rm -p cn-bj-test2.rgw.buckets.index .dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.9
+ rados rm -p cn-bj-test2.rgw.buckets.index .dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.14
+ rados rm -p cn-bj-test2.rgw.buckets.index .dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.10
+ rados rm -p cn-bj-test2.rgw.buckets.index .dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.12
+ rados rm -p cn-bj-test2.rgw.buckets.index .dir.afd874cd-f976-4007-a77c-be6fca298b71.34209.1.8
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回收meta pool的数据

[root@demo123 cephuser]# rados ls -p cn-bj-test2.rgw.meta --all
root demo1
root .bucket.meta.demo1:afd874cd-f976-4007-a77c-be6fca298b71.45786.1
root .bucket.meta.demo1:afd874cd-f976-4007-a77c-be6fca298b71.34209.1 #残留
root my-new-container_segments
root .bucket.meta.demo2:afd874cd-f976-4007-a77c-be6fca298b71.34353.1
root .bucket.meta.my-new-container:afd874cd-f976-4007-a77c-be6fca298b71.7991.1
users.uid s3test.buckets
users.uid swiftuser
users.swift swiftuser:swiftuser1
users.keys SNACA4LX9DS21NGMSRX4
root .bucket.meta.my-new-container_segments:afd874cd-f976-4007-a77c-be6fca298b71.7991.4
users.uid s3test
root demo2
users.keys XP8E2452AB6EBU3RPD0C
root my-new-container
users.uid swiftuser.buckets
users.uid synchronization-user
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注意这里用的ceph L版本，使用了namespace，所以要指定namespace才能删除

[root@demo123 cephuser]# rados rm  -p cn-bj-test2.rgw.meta .bucket.meta.demo1:afd874cd-f976-4007-a77c-be6fca298b71.34209.1 --namespace=root
[root@demo123 cephuser]# rados ls -p cn-bj-test2.rgw.meta --all
root demo1
root .bucket.meta.demo1:afd874cd-f976-4007-a77c-be6fca298b71.45786.1
root my-new-container_segments
root .bucket.meta.demo2:afd874cd-f976-4007-a77c-be6fca298b71.34353.1
root .bucket.meta.my-new-container:afd874cd-f976-4007-a77c-be6fca298b71.7991.1
users.uid s3test.buckets
users.uid swiftuser
users.swift swiftuser:swiftuser1
users.keys SNACA4LX9DS21NGMSRX4
root .bucket.meta.my-new-container_segments:afd874cd-f976-4007-a77c-be6fca298b71.7991.4
users.uid s3test
root demo2
users.keys XP8E2452AB6EBU3RPD0C
root my-new-container
users.uid swiftuser.buckets
users.uid synchronization-user
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清除large omap告警
删完了object并不会恢复告警，需要手工对相应的pg进行deep-scrub操作，具体如下

[root@demo123 cephuser]# python large_omap.py
Large omap objects poolname = cn-bj-test2.rgw.buckets.index
pgid=13.33 OSDs=[59, 79, 19] num_large_omap_objects=1
pgid=13.3c OSDs=[49, 29, 78] num_large_omap_objects=1
pgid=13.3d OSDs=[48, 69, 9] num_large_omap_objects=1
pgid=13.45 OSDs=[88, 39, 28] num_large_omap_objects=1
pgid=13.4d OSDs=[38, 29, 89] num_large_omap_objects=1
pgid=13.50 OSDs=[68, 19, 59] num_large_omap_objects=1
pgid=13.6b OSDs=[39, 79, 8] num_large_omap_objects=1
pgid=13.8e OSDs=[38, 9, 78] num_large_omap_objects=1
pgid=13.d1 OSDs=[9, 88, 38] num_large_omap_objects=1
pgid=13.d2 OSDs=[59, 88, 28] num_large_omap_objects=1
pgid=13.e1 OSDs=[19, 88, 49] num_large_omap_objects=1
pgid=13.e4 OSDs=[38, 19, 89] num_large_omap_objects=1
pgid=13.e7 OSDs=[19, 89, 38] num_large_omap_objects=1
pgid=13.ec OSDs=[89, 28, 48] num_large_omap_objects=1
pgid=13.f5 OSDs=[38, 88, 19] num_large_omap_objects=1
[root@demo123 cephuser]# ceph pg deep-scrub 13.33
instructing pg 13.33 on osd.59 to deep-scrub
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操作完可以看到有pg进行dep-scrub，之后状态恢复

[root@demo123 cephuser]# ceph -s
  cluster:
id:    21cc0dcd-06f3-4d5d-82c2-dbd411ef0ed9
health: HEALTH_WARN
         16 large omap objects

  services:
mon: 3 daemons, quorum demo122,demo131,demo141
mgr: demo141(active)
osd: 90 osds: 90 up, 90 in
rgw: 1 daemon active

  data:
pools: 7 pools, 3712 pgs
objects: 20.13M objects, 1.80TiB
usage: 7.28TiB used, 408TiB / 415TiB avail
pgs:    3711 active+clean
         1 active+clean+scrubbing+deep #开始deep scrub

  io:
client: 5.29MiB/s rd, 935B/s wr, 69op/s rd, 28op/s wr

[root@demo123 cephuser]# ceph -s
  cluster:
id:    21cc0dcd-06f3-4d5d-82c2-dbd411ef0ed9
health: HEALTH_WARN
         15 large omap objects #减少了1个

  services:
mon: 3 daemons, quorum demo122,demo131,demo141
mgr: demo141(active)
osd: 90 osds: 90 up, 90 in
rgw: 1 daemon active

  data:
pools: 7 pools, 3712 pgs
objects: 20.13M objects, 1.80TiB
usage: 7.28TiB used, 408TiB / 415TiB avail
pgs:    3712 active+clean

  io:
client: 5.33MiB/s rd, 680B/s wr, 36op/s rd, 6op/s wr
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总结
index pool的omap告警一般就分为两类：

一类是object条目数过多，导致对应的index 元数据条目数过多，可以用上面的方法处理。
另外一类是bilog过多，这里的方法就不适用了，需要手工进行bilog清理，关于bilog后续会有详细章节介绍。

admin · 发表于 2022-8-23 09:54:43

线上multisite环境出现HEALTH_WARN 32 large omap objects，已经bucket auto reshard=false，所以排除是bucket index 所在的shard omap过大引发的问题，官方的给出的告警信息无法定位到具体的object，于是有了下面的排错过程

排查过程
[root@demo supdev]# ceph health detail
HEALTH_WARN 32 large omap objects
LARGE_OMAP_OBJECTS 32 large omap objects
32 large objects found in pool 'cn-bj-test1.rgw.log' #出现large omap的pool
Search the cluster log for 'Large omap object found' for more details.

[root@demo supdev]# ceph pg ls-by-pool cn-bj-test1.rgw.log |awk '{print "ceph pg "$1 " query|grep num_large_omap_objects"}'|sh -x
ceph pg 11.0 query|grep num_large_omap_objects
ceph pg 11.1 query|grep num_large_omap_objects
ceph pg 11.2 query|grep num_large_omap_objects
......
+ ceph pg 11.1e6 query
+ grep num_large_omap_objects
            "num_large_omap_objects": 1 #有large omap的objcet数量
                  "num_large_omap_objects": 0
                  "num_large_omap_objects": 0

[root@demo supdev]# ceph pg 11.1e6 query #查询pg详细信息
{
"state": "active+clean",
.....
"info": {
      "pgid": "11.1e6",
      "last_update": "10075'3051746",
      "last_complete": "10075'3051746",
      "log_tail": "10075'3050200",
      "last_user_version": 3051746,
      "last_backfill": "MAX",
      "last_backfill_bitwise": 0,
      "purged_snaps": [],
.....

            "acting": [
                  46, #主OSD id=46
                  63, #从OSD
                  23  #从OSD
            ],
         "stat_sum": {
            "num_bytes": 40,
            "num_objects": 2,
            "num_object_clones": 0,
            "num_object_copies": 6,
            "num_objects_missing_on_primary": 0,
            "num_objects_missing": 0,
            "num_objects_degraded": 0,
            "num_objects_misplaced": 0,
            "num_objects_unfound": 0,
            "num_objects_dirty": 2,
            "num_whiteouts": 0,
            "num_read": 3055759,
            "num_read_kb": 3056162,
            "num_write": 5986011,
            "num_write_kb": 53,
            "num_scrub_errors": 0,
            "num_shallow_scrub_errors": 0,
            "num_deep_scrub_errors": 0,
            "num_objects_recovered": 0,
            "num_bytes_recovered": 0,
            "num_keys_recovered": 0,
            "num_objects_omap": 1,
            "num_objects_hit_set_archive": 0,
            "num_bytes_hit_set_archive": 0,
            "num_flush": 0,
            "num_flush_kb": 0,
            "num_evict": 0,
            "num_evict_kb": 0,
            "num_promote": 0,
            "num_flush_mode_high": 0,
            "num_flush_mode_low": 0,
            "num_evict_mode_some": 0,
            "num_evict_mode_full": 0,
            "num_objects_pinned": 0,
            "num_legacy_snapsets": 0,
            "num_large_omap_objects": 1 #large omap的object数量
         },
         ...
            "agent_state": {}
}

[root@demo supdev]# ceph osd find 46 #根据OSD id找到对应的主机信息
{
"osd": 46,
"ip": "100.1.1.40:6812/3691515",
"crush_location": {
      "host": "TX-100-1-40-sata",
      "media": "site1-rack2-sata",
      "mediagroup": "site1-sata",
      "root": "default"
}
}

[root@demo supdev]# zcat /var/log/ceph/ceph-osd.46.log-20181210.gz |grep omap #根据OSD日志找到具体的object名称
2018-12-09 23:03:18.803799 7f90e9b46700  0 log_channel(cluster) log [WRN] : Large omap object found. Object: 11:67885262:::sync.error-log.3:head Key count: 2934286 Size (bytes): 657040594
#OSD 46上的object名称为sync.error-log.3的omap超出标准

[root@demo supdev]# rados ls -p cn-bj-test1.rgw.log|grep "sync.error-log.3$" #确定objects存在
sync.error-log.3

#注意整个multisite的同步过程中的错误日志信息以omap形式存储在sync.error-log.*
#吐槽一下，错误日志分32个shard存储，代码写死了，而且错误日志目前还只能通过手工清理，无法像其他日志一样自动trim，随着错误日志不断堆积，才引发了今天的问题。

[root@demo supdev]# radosgw-admin sync error list|more#查看错误日志
[
{
      "shard_id": 0,
      "entries": [
         {
            "id": "1_1540890427.972991_36.1",
            "section": "data",
            "name": "demo2:afd874cd-f976-4007-a77c-be6fca298b71.34353.1:3",
            "timestamp": "2018-10-30 09:07:07.972991Z",
            "info": {
                  "source_zone": "afd874cd-f976-4007-a77c-be6fca298b71",
                  "error_code": 5,
                  "message": "failed to sync bucket instance: (5) Input/output error"
            }
         },
......
         {
            "id": "1_1543395420.626552_32014.1",
            "section": "data",
            "name": "demo1:afd874cd-f976-4007-a77c-be6fca298b71.34209.1:0/file1205085",
            "timestamp": "2018-11-28 08:57:00.626552Z",
            "info": {
                  "source_zone": "afd874cd-f976-4007-a77c-be6fca298b71",
                  "error_code": 5,
                  "message": "failed to sync object(5) Input/output error"
            }
         }

[root@TX-97-140-6 supdev]# radosgw-admin sync error trim --start-date=2018-11-14 --end-date=2018-11-28 #按日期清理错误日志记录
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优化定位效率
简单写了个脚本，先根据warn信息找pool，之后再根据pool找出有large omap objects的pg，凑合用，不保证没bug，在12.2.10下面测试通过。

[root@demo cephuser]# cat large_obj.py
import json
import rados
import rbd

ceph_conf_path = '/etc/ceph/ceph.conf'
rados_connect_timeout = 5

class RADOSClient(object):
def __init__(self,driver,pool=None):
      self.driver = driver
      self.client, self.ioctx = driver._connect_to_rados(pool)
def __enter__(self):
      return self
def __exit__(self, type_, value, traceback):
      self.driver._disconnect_from_rados(self.client, self.ioctx)

class RBDDriver(object):
def __init__(self,ceph_conf_path,rados_connect_timeout,pool=None):
      self.ceph_conf_path = ceph_conf_path
      self.rados_connect_timeout = rados_connect_timeout
      self.pool = pool
def _connect_to_rados(self, pool=None):
      client = rados.Rados(conffile=self.ceph_conf_path)
      try:
         if self.rados_connect_timeout >= 0:
            client.connect(timeout=
                           self.rados_connect_timeout)
         else:
            client.connect()
         if self.pool == None:
                              ioctx = None
         else:
                              ioctx = client.open_ioctx(self.pool)
         return client, ioctx
      except rados.Error:
         msg = "Error connecting to ceph cluster."
         client.shutdown()
         raise msg

def _disconnect_from_rados(self, client, ioctx=None):
            if ioctx == None:
                     client.shutdown()
            else:
                     ioctx.close()
                     client.shutdown()

class cmd_manager():
def get_large_omap_obj_poolname(self):
      with RADOSClient(RBDDriver(ceph_conf_path,rados_connect_timeout)) as dr:
            result = ''
            cmd = '{"prefix": "health", "detail": "detail", "format": "json"}'
            result = dr.client.mon_command(cmd,result)
            if result[0] == 0:
                  res_ = json.loads(result[1])
                  if res_["checks"]['LARGE_OMAP_OBJECTS']:
                     return res_["checks"]['LARGE_OMAP_OBJECTS']['detail'][0]['message'].split("'")[1]
            else:
                  return False
def get_pg_list_by_pool(self,poolname):
      with RADOSClient(RBDDriver(ceph_conf_path,rados_connect_timeout)) as dr:
            result = ''
            cmd = '{"prefix": "pg ls-by-pool", "poolstr": "' + poolname + '", "format": "json"}'
            result = dr.client.mon_command(cmd,result)
            if result[0] == 0:
                  return json.loads(result[1])
            else:
                  return False

cmd_ = cmd_manager()
poolname =  cmd_.get_large_omap_obj_poolname()
print "Large omap objects poolname = {0}".format(poolname)
res =  cmd_.get_pg_list_by_pool(poolname)
for i in res:
if i["stat_sum"]["num_large_omap_objects"] != 0:
      print "pgid={0} OSDs={1} num_large_omap_objects={2}".format(i["pgid"],i["acting"],i["stat_sum"]["num_large_omap_objects"])
复制
再爆一个雷
如果你认为通过上面方式清除omap集群就能立马恢复状态，那就太天真，告警信息“HEALTH_WARN 32 large omap objects”依然挂在那里不尴不尬，虽然omap清理了，但是因为对应PG状态没更新，所以告警信息依然存在，只能通过手工或者其他方式去触发PG的状态更新，我这边是通过ceph pg deep-scrub {pg}去触发pg信息更新，注意如果你用scrub是没用，必须deep-scrub，这里又要吐槽官方的逻辑设计，真是WFK！当然你也可以放那里不管，等后台自动deep-scrub也能恢复。

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