[HDFS-14462] WebHDFS throws "Error writing request body to server" instead of DSQuotaExceededException

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.2.0, 2.9.2, 3.0.3, 2.8.5, 2.7.7, 3.1.2
• Fix Version/s: 2.10.0, 3.0.4, 3.3.0, 3.2.1, 3.1.3
• Component/s: webhdfs
• Target Version/s: 2.8.6
• Assignee: Simbarashe Dzinamarira
• Reporter: Erik Krogen
• Created: 30/Apr/19 16:34
• Updated: 02/Aug/19 19:05
• Resolved: 02/Aug/19 19:02

Description

We noticed recently in our environment that, when writing data to HDFS via WebHDFS, a quota exception is returned to the client as:

java.io.IOException: Error writing request body to server
        at sun.net.www.protocol.http.HttpURLConnection$StreamingOutputStream.checkError(HttpURLConnection.java:3536) ~[?:1.8.0_172]
        at sun.net.www.protocol.http.HttpURLConnection$StreamingOutputStream.write(HttpURLConnection.java:3519) ~[?:1.8.0_172]
        at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82) ~[?:1.8.0_172]
        at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140) ~[?:1.8.0_172]
        at java.io.FilterOutputStream.flush(FilterOutputStream.java:140) ~[?:1.8.0_172]
        at java.io.DataOutputStream.flush(DataOutputStream.java:123) ~[?:1.8.0_172]

It is entirely opaque to the user that this exception was caused because they exceeded their quota. Yet in the DataNode logs:

2019-04-24 02:13:09,639 WARN org.apache.hadoop.hdfs.DFSClient: DataStreamer Exception
org.apache.hadoop.hdfs.protocol.DSQuotaExceededException: The DiskSpace quota of /foo/path/here is exceeded: quota = XXXXXXXXXXXX B = X TB but diskspace consumed = XXXXXXXXXXXXXXXX B = X TB
        at org.apache.hadoop.hdfs.server.namenode.DirectoryWithQuotaFeature.verifyStoragespaceQuota(DirectoryWithQuotaFeature.java:211)
        at org.apache.hadoop.hdfs.server.namenode.DirectoryWithQuotaFeature.verifyQuota(DirectoryWithQuotaFeature.java:239)

This was on a 2.7.x cluster, but I verified that the same logic exists on trunk. I believe we need to fix some of the logic within the ExceptionHandler to add special handling for the quota exception.

Issue Links

• depends upon: HDFS-11195 Return error when appending files by webhdfs rest api fails