Alluxio运维
Alluxio命令
alluxio fsadmin
# 查看服务状态
alluxio fsadmin report
# 查看挂掉的服务ip
alluxio fsadmin report capacity -lost
alluxio getConf
# 查看配置参数
alluxio getConf --master
Alluxio运维实战
Worker节点挂掉
查看服务状态，发现有一台worker节点丢失
查看丢失的节点是哪一台
$ alluxio fsadmin report capacity -lost
sjsysc-hh405-zbhx700w登录到丢失的worker节点，启动worker
$ ssh sjsysc-hh405-zbhx700w
$ alluxio-start.sh worker SudoMount
设置子目录挂载点
待Alluxio启动完毕之后，用户可以在挂载其他子目录，例如，将另一个hadoop集群的hdfs目录挂载到alluxio中。
当我们挂载配置不同的HDFS时候，可以在挂载的时候特别指定每一个HDFS所对应的配置信息（hdfs-site.xml,core-site.xml）：
alluxio fs mount /ia_test hdfs://nameservice1/ia_test \
--option alluxio.underfs.hdfs.configuration=/opt/alluxio/hdfs/ia_conf/hdfs-site.xml:/opt/alluxio/hdfs/ia_conf/core-site.xml
挂载要求：
端口打通
（1） 需要打通alluxio集群到hdfs集群namenode 的8020端口
如果不打通此端口，则会报如下错误：
java.net.UnknownHostException: nameservice1（2）需要打通alluxio集群到hdfs集群datanode的9866、9867端口
如果不打通此端口，则操作alluxio 文件时，会报如下错误：
Attempt 1 to load /hive/dwa_d_ia_basic_user_all/month_id=202105/day_id=19/prov_id=097/000016_0.gz failed because: Task execution failed: Could not obtain block: BP-467187067-10.177.36.3-1591087438300:blk_4563885290_3807183975 file=/user/alluxio_ia/dwa_d_ia_basic_user_all/month_id=202105/day_id=19/prov_id=097/000016_0.gz (Zero Copy GrpcDataReader)
Attempt 1 to load /hive/dwa_d_ia_basic_user_all/month_id=202105/day_id=19/prov_id=097/000083_0.gz failed because: Task execution failed: Could not obtain block: BP-467187067-10.177.36.3-1591087438300:blk_4564100089_3807398774 file=/user/alluxio_ia/dwa_d_ia_basic_user_all/month_id=202105/day_id=19/prov_id=097/000083_0.gz (Zero Copy GrpcDataReader)
Attempt 1 to load /hive/dwa_d_ia_basic_user_all/month_id=202105/day_id=19/prov_id=097/000115_0.gz failed because: Task execution failed: Could not obtain block: BP-467187067-10.177.36.3-1591087438300:blk_4564170915_3807469600 file=/user/alluxio_ia/dwa_d_ia_basic_user_all/month_id=202105/day_id=19/prov_id=097/000115_0.gz (Zero Copy GrpcDataReader)
Attempt 1 to load /hive/dwa_d_ia_basic_user_all/month_id=202105/day_id=19/prov_id=097/000079_0.gz failed because: Task execution failed: Could not obtain block: BP-467187067-10.177.36.3-1591087438300:blk_4564086733_3807385418 file=/user/alluxio_ia/dwa_d_ia_basic_user_all/month_id=202105/day_id=19/prov_id=097/000079_0.gz (Zero Copy GrpcDataReader)
Attempt 1 to load /hive/dwa_d_ia_basic_user_all/month_id=202105/day_id=19/prov_id=097/000041_0.gz failed because: Task execution failed: Could not obtain block: BP-467187067-10.177.36.3-1591087438300:blk_4563964409_3807263094 file=/user/alluxio_ia/dwa_d_ia_basic_user_all/month_id=202105/day_id=19/prov_id=097/000041_0.gz (Zero Copy GrpcDataReader)
Attempt 1 to load /hive/dwa_d_ia_basic_user_all/month_id=202105/day_id=19/prov_id=097/000103_0.gz failed because: Task execution failed: Could not obtain block: BP-467187067-10.177.36.3-1591087438300:blk_4564147300_3807445985 file=/user/alluxio_ia/dwa_d_ia_basic_user_all/month_id=202105/day_id=19/prov_id=097/000103_0.gz (Zero Copy GrpcDataReader)
Attempt 1 to load /hive/dwa_d_ia_basic_user_all/month_id=202105/day_id=19/prov_id=097/000046_0.gz failed because: Task execution failed: Could not obtain block: BP-467187067-10.177.36.3-1591087438300:blk_4563978019_3807276704 file=/user/alluxio_ia/dwa_d_ia_basic_user_all/month_id=202105/day_id=19/prov_id=097/000046_0.gz (Zero Copy GrpcDataReader)
需要将hdfs配置文件发放到alluxio集群的所有节点上，并且配置文件及其所有父目录具有755权限。
否则挂载文件时会报如下错误：
java.net.UnknownHostException: nameservice1
如果只是mount hdfs目录，只需要将hdfs 配置文件发放到所有alluxio mastera节点即可，但是当操作alluxio 文件时，如果不讲hdfs配置文件发放到所有alluxio worker节点，则会报如下错误：
[alluxio@sjsysc-hh405-zbhx1135w ~]$ alluxio fs copyToLocal /hive-test/dm_m_ia_prefer_label_app_top5/month_id=202104/prov_id=084/000002_0.gz .
Failed to read block ID=287209160704 from tiered storage and UFS tier: com.google.common.util.concurrent.UncheckedExecutionException: java.lang.IllegalArgumentException: java.net.UnknownHostException: nameservice1 (Zero Copy GrpcDataReader)
注意：一般将配置文件放到 /opt 或者 /usr/local 这样的目录下，因为这样的目录都可执行权限，不要将配置文件放到 /home/用户/目录下，因为这个目录给父目录增加755权限的时候，ssh 免密登录会失效！！！
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