There are 2 missing blocks. The following files may be corrupted：
步骤1，检查文件缺失情况
可以看到，
blk_1074785806 /var/log/yarn_hislog/yarn/apps/root/logs/application_1531830253305_4290/master66_38210
blk_1074785807 /var/log/yarn_hislog/yarn/apps/root/logs/application_1531830253305_4289/master66_38210
确实各自都丢失了1个Block， 文件已经损坏，不可恢复。
[root@master66 datacollectors]# hdfs fsck /var/log/yarn_hislog/yarn/apps/root/logs/application_1531830253305_4290/master66_38210 Connecting to namenode via http://master66:50070
FSCK started by root (auth:SIMPLE) from /10.3.70.116 for path /var/log/yarn_hislog/yarn/apps/root/logs/application_1531830253305_4290/master66_38210 at Thu Sep 06 09:23:04 CST 2018 . /var/log/yarn_hislog/yarn/apps/root/logs/application_1531830253305_4290/master66_38210: CORRUPT blockpool BP-1198174473-10.17.139.66-1492053574238 block blk_1074785806 /var/log/yarn_hislog/yarn/apps/root/logs/application_1531830253305_4290/master66_38210: MISSING 1 blocks of total size 41235 B.Status: CORRUPT Total size: 41235 B Total dirs: 0 Total files: 1 Total symlinks: 0 Total blocks (validated): 1 (avg. block size 41235 B) ******************************** CORRUPT FILES: 1 MISSING BLOCKS: 1 MISSING SIZE: 41235 B CORRUPT BLOCKS: 1
******************************** Minimally replicated blocks: 0 (0.0 %) Over-replicated blocks: 0 (0.0 %) Under-replicated blocks: 0 (0.0 %) Mis-replicated blocks: 0 (0.0 %) Default replication factor: 1 Average block replication: 0.0 Corrupt blocks: 1 Missing replicas: 0 Number of data-nodes: 1 Number of racks: 1 FSCK ended at Thu Sep 06 09:23:04 CST 2018 in 1 milliseconds The filesystem under path '/var/log/yarn_hislog/yarn/apps/root/logs/application_1531830253305_4290/master66_38210' is CORRUPT
步骤2，删除缺失文件
hdfs fsck -delete blk_1074785806 /var/log/yarn_hislog/yarn/apps/root/logs/application_1531830253305_4290/master66_38210 hdfs fsck -delete blk_1074785807 /var/log/yarn_hislog/yarn/apps/root/logs/application_1531830253305_4289/master66_38210
步骤3， 检查集群健康状况
