HADOOP-18082.Add debug log when RPC#Reader gets a Call. #3891
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Here are some failed unit tests: It doesn't look like it has much to do with what I'm submitting. |
tomscut
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Jan 18, 2022
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If only callId is output, there may be too little useful information. What do you think?
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Thanks @tomscut for the comment and review.
The detailed log here is this:
2022-01-18 16:37:56,653 DEBUG org.apache.hadoop.ipc.Server: Call#75 Retry#0 org.apache.hadoop.hdfs.protocol.ClientProtocol.getFileInfo from xxxx.xxxx.xxxx.xxxx:port has entered the CallQueue and is waiting to be processed. 2022-01-18 16:37:56,654 DEBUG org.apache.hadoop.ipc.Server: Call#76 Retry#0 org.apache.hadoop.hdfs.protocol.ClientProtocol.getFileInfo from xxxx.xxxx.xxxx.xxxx:port has entered the CallQueue and is waiting to be processed.
When the Call is processed by Hanler, the detailed log is as follows:
2022-01-18 16:37:59,725 [5178363759] - WARN [IPC Server handler 126 on 8025:Server@494] - Slow RPC : getFileInfo took 509 milliseconds to process from client Call#76 Retry#0 org.apache.hadoop.hdfs.protocol.ClientProtocol.getFileInfo from xxxx.xxxx.xxxx.xxxx:port
In my opinion, the Calls recorded in these two places should be consistent.
@tomscut , do you have any good suggestions.
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I'm sorry I made a mistake. The output here is not only callId. And I think it is ok.
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The change to add a DEBUG log seems good, but how about this line instead?
LOG.debug("Call has entered the CallQueue and is waiting to be processed. Call details: {}", call);
Usually we tend to read object's string presentation at the end to not mix up with the log statement, e.g RpcCall's toString() has word "from" and perhaps it becomes bit difficult to read the whole statement at the first sight, but if put at the end of the statement, we know that now we are only looking at RpcCall details:
@Override
public String toString() {
return super.toString() + " " + rpcRequest + " from " + connection;
}
tomscut
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Jan 19, 2022
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I'm sorry I made a mistake. The output here is not only callId. And I think it is ok.
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Thanks @tomscut . |
virajjasani
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Jan 21, 2022
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The change to add a DEBUG log seems good, but how about this line instead?
LOG.debug("Call has entered the CallQueue and is waiting to be processed. Call details: {}", call);
Usually we tend to read object's string presentation at the end to not mix up with the log statement, e.g RpcCall's toString() has word "from" and perhaps it becomes bit difficult to read the whole statement at the first sight, but if put at the end of the statement, we know that now we are only looking at RpcCall details:
@Override
public String toString() {
return super.toString() + " " + rpcRequest + " from " + connection;
}
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Latest change looks good. +1(non-binding) |
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Thanks @virajjasani . |
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Thanks @ayushtkn . |
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Hi @ayushtkn , can this pr be merged into trunk branch or other main branch? |
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Merged. Thanx Everyone!!! |
asfgit
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…. Contributed by JiangHua Zhu." Exposes a Race Condition. Which leads to test failures in YARN. (HADOOP-18143) This reverts commit 2025243.
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…. Contributed by JiangHua Zhu.
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Description of PR
Log some information from the moment Call enters the RPC inside, which will help us understand more about Call.
The records here should be in the form of logs. The priority of the logs should not be too high, and debugging is the best.
Details: HADOOP-18082
How was this patch tested?
Corresponding to the test, the pressure is not large.