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Could not obtain block

log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Exception in thread “main” org.apache.hadoop.hdfs.BlockMissingException: Could not obtain block: BP-975754814-172.27.240.199-1638625552702:blk_1073741838_1015 file=/hdfsapi/test/b.txt
at org.apache.hadoop.hdfs.DFSInputStream.refetchLocations(DFSInputStream.java:1049)
at org.apache.hadoop.hdfs.DFSInputStream.chooseDataNode(DFSInputStream.java:1032)
at org.apache.hadoop.hdfs.DFSInputStream.chooseDataNode(DFSInputStream.java:1011)
at org.apache.hadoop.hdfs.DFSInputStream.blockSeekTo(DFSInputStream.java:650)
at org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:904)
at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:963)
at java.io.DataInputStream.read(Unknown Source)
at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
at sun.nio.cs.StreamDecoder.read(Unknown Source)
at java.io.InputStreamReader.read(Unknown Source)
at java.io.BufferedReader.fill(Unknown Source)
at java.io.BufferedReader.readLine(Unknown Source)
at java.io.BufferedReader.readLine(Unknown Source)
at com.imooc.bigdata.hadoop.hdfs.HDFSWCApp01.main(HDFSWCApp01.java:42)