Wei-Chiu Chuang created HDFS-12165:
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Summary: getSnapshotDiffReport throws NegativeArraySizeException
for very large snapshot diff summary
Key: HDFS-12165
URL: https://issues.apache.org/jira/browse/HDFS-12165
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Wei-Chiu Chuang
For a really large snapshot diff, getSnapshotDiffReport throws
NegativeArraySizeException
{noformat}
2017-07-19 11:14:16,415 WARN org.apache.hadoop.ipc.Server: Error serializing
call response for call
org.apache.hadoop.hdfs.protocol.ClientProtocol.getSnapshotDiffReport
from 10.17.211.10:58223 Call#0 Retry#0
java.lang.NegativeArraySizeException
at
com.google.protobuf.CodedOutputStream.newInstance(CodedOutputStream.java:105)
at
com.google.protobuf.AbstractMessageLite.writeDelimitedTo(AbstractMessageLite.java:87)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$RpcResponseWrapper.write(ProtobufRpcEngine.java:468)
at org.apache.hadoop.ipc.Server.setupResponse(Server.java:2410)
at org.apache.hadoop.ipc.Server.access$500(Server.java:134)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2182)
{noformat}
This particular snapshot diff contains more than 25 million different file
system objects, and which means the serialized response can be more than 2GB,
overflowing protobuf length calculation.
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