手動修復 under-replicated blocks in HDFS

解決方式步驟：

1、進入hdfs的pod

kubectl get pod -o wide | grep hdfs

kubectl exec -ti hadoop-hdfs-namenode-hdfs1-948569108-c5d70 bash 

2、獲取票據

kinit -kt /etc/hdfs1/conf/hdfs.keytab hdfs/gz232-112

3、查詢每個blocks信息

hdfs fsck -blocks -files -locations /

4、找出replication != 3 的blocks

hdfs fsck / | grep 'Under replicated'

5、cat /tmp/under_replicated_files  查看，是不是所有的都是這個問題

6、手動修復 under_replicated_files

su - <$hdfs_user>

hdfs fsck / | grep 'Under replicated' | awk -F':' '{print $1}' >> /tmp/under_replicated_files

for hdfsfile in `cat /tmp/under_replicated_files`; do echo "Fixing $hdfsfile :" ;  hadoop fs -setrep 3 $hdfsfile; done